Activated H and acid sites played a synergistic role for the formation of allyl alcohol. Subsequent oxidation and syn-elimination then furnished allylic alcohol 6 in 94% yield. The strain also had the capacity of stereoselectively reducing aromatic ketones to ( S )-enantioselective alcohols. prepared! — Aromatic iodides are converted to both enantiomers of allylic alcohols via a two-step 18- 068 process including Pd-catalyzed Heck reaction with butenone (II) followed by stereose- … The selectivity of allyl alcohol remained higher than 68.7 % with a 89.7 % conversion of glycerol at 250 °C, 2 MPa and WHSV = 2.6 h−1. Their preparation and reactivity have long attracted the interest of synthetic organic chemists. with excellent diastereoselectivity. Soc., 2010, A nickel(0) N-heterocyclic carbene complex-catalyzed coupling of α-silyloxy Show transcribed image text. Select The Best Reagent For Each Step. A variety of primary allylic alcohols can be isomerized to aldehydes on treatment with N-lithioethylenediamine or N-lithioaminopropylamine in the amine as the solvent < 85CC812 >. Synthesis of 1,2‐Amino Alcohols by Sigmatropic Rearrangements of 3‐(N‐Tosylamino)allylic Alcohol Derivatives Dr. Marion Barbazanges Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS (UMR 7084), 10 rue Vauquelin 75231 Paris Cedex 05 (France), Fax: (+33) 140‐79‐46‐60 J. U. Rhee, M. J. Krische, J. Synthesis of allylic alcohols from alkenes and their derivatives View the table of contents for this issue, or go to the journal homepage for more 2004 Russ. Soc., 2006, 2008 Alcohols Q 0230 Chiral (R)- and (S)-Allylic Alcohols via a One-Pot Chemoenzymatic Synthesis. Allyl alcohol is a pivotal intermediate and it is of great importance to find a new way for the selective production of allyl alcohol from renewable and surplus glycerol. While the transmetallation strategy requires the preparation of a “primary organometallic reagent,” the reductive coupling of acetylenes is … Allyl alcohol is converted mainly to glycidol, which is a chemical intermediate in the synthesis of glycerol, glycidyl ethers, esters, and amines. esters. And the reaction mechanism over CoFe alloy was proposed on the basis of controlled experiments. carbonates! Selective hydroboration–protonation of allylic alcohol approach Michael E. Jung*, Dongwon Yoo Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, United States Allyl alcohol is a unique solvent for DATBP synthesis. Direct synthesis of allyl alcohol from glycerol over CoFe alloy. A variety of allylic alcohol substrates work well, although substitution on the alkene is only tolerated at the γ-position, and not the β-position . China See all articles by this author. Strain WZY002, an Organism Potentially Useful for the Synthesis of ,-Unsaturated Alcohols from Allylic Aldehydes and Ketones Xiangxian Ying, aYifang Wang, Bin Xiong, Tingting Wu, aLiping Xie, Meilan Yu,b Zhao Wanga At this point, we observed that the general procedure does not work … PAPER 2293 Direct Synthesis of Functionalized Allylic Boronic Esters from Allylic Alcohols and Inexpensive Reagents and Catalysts Allylic Boronic Esters from Allylic AlcoholsGuillaume Dutheuil, a Nicklas Selander, b Kálmán J. Szabó,*b Varinder K. Aggarwal*a a School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, UK Fax +44(117)9298611; E-mail: v.aggarwal@bristol.ac.uk Allylic alcohol transposition by ortho ester-initiated carbonate extension. Download : Download high-res image (148KB)Download : Download full-size image. Allylic acetates and carbonates are converted into β,γ-unsaturated nitriles by treatment with TMS-CN, and Pd(PPh 3) 4 < 93JOC16 >. The reaction is applied to the kinetic resolution of a secondary … An in situ preparation of highly stereoretentive dithiolate ruthenium-based Also, a variety of polymerizable esters are prepared from allyl alcohol, e.g. 7H2O/NaI A highly diastereoselective synthesis of homoallylic alcohols bearing up to two adjacent quaternary centers was achieved using these polysubstituted allylic zinc reagents. The reaction is somewhat capricious although in favourable cases very good yields of the expected aldehyde are obtained (Equation (6)). Show all authors. 128, 10674-10675. β-Lithiooxyphosphonium ylides, generated in situ from aldehydes and Wittig Both the epoxidation and Wharton transposition reactions could be achieved providing the desired allylic alcohol 4a with high enantioselectivity. in high yields and enantioselectivities using Taniaphos as ligand. We used the 1,3-rearrangement reaction of an allylic alcohol in hot water as part of an attractive new strategy for construction of the polyene natural product navenone B by iterative use of a Grignard reaction, a 1,3-rearrangement of the resulting allylic alcohol, and … Chem. These include: dynamic kinetic resolution (DKR/DKAT), nucleophilic 1,2‐addition to carbonyl groups, allylic substitution, oxidation of C © 2020 Elsevier B.V. All rights reserved. This K. Sa-ei, J. Montgomery, Org. Thionyl chloride has been used traditionally as the reagent of choice to ensure a high degree of selectivity in favor of allylic transposition, however, the outcome is often less predictable than desired. Subsequent 1,3-transposition of allylic alcohols in one pot is capable of synthesizing 2-hydroxymethylindoles in generally moderate to good yields. Although the presence of an allylic alcohol does lead to increased stereoselectivity, the rates of these reactions are slower than systems lacking alcohols. products. 128, 15572-15573. The observed regio- and stereoselective SeO(2) allylic oxidation protocol has also been extended to the diastereoselective total synthesis of bioactive natural product isomintlactone, its direct conversion to mintlactone and an example of the base-catalyzed intramolecular rearrangement of γ-lactone to δ-lactone. . Regio- and reagents, react readily with halomethyl esters to form trisubstituted Z-allylic (°C) Allylic alcohol Product Yield (%)a 1 43 70 7 8j 83 2 43 60 12 8m 69 3 67 60 4 8n 83 4 42 60 13 8o 64 Figure 1: Initial side product with TMHQ. Mingzhong Cai . Nicolás Ríos-Lombardía, Cristian Vidal, María Cocina, Francisco Morís, Joaquín García-Álvarez, Javier González-Sabín, Chemoenzymatic one-pot synthesis in an aqueous medium: combination of metal-catalysed allylic alcohol isomerisation–asymmetric bioamination, Chemical Communications, 10.1039/C5CC03298A, 51, 54, (10937-10940), (2015). Lett., 2010, Rev. useful method for the generation of vinyl anion equivalents. The scope and utility of this method are demonstrated by the synthesis of challenging allylic amines and their … Le Nôtre, O. Baslé, M. Mauduit, Org. Department of Chemistry, Jiangxi Normal University, … In this work, we want to report the high performance of CoFe alloy for the direct synthesis of allyl alcohol from glycerol. However, regio- and stereoselectivity can be achived by coupling allylic alcohol transposition to a subsequent step that is kinetically and thermodynamically favorable. A highly enantioselective and catalytic vinylation of aldehydes leads to allylic alcohols that are then transformed to the allylic amines via Overman's [3,3]-sigmatropic rearrangement of imidates. 2004, 1504-1508. Allyl alcohol formed directly via the simultaneously dehydration + hydrogenation of glycerol on CoFe. 1 While numerous ways have been described to synthesize secondary allylic alcohols in a highly enantioselective fashion, there are few examples for the challenging catalytic asymmetric synthesis of tertiary allylic alcohols. Figure 5. synthetic application of a 1,3 Csp2-to-O silyl migration provides a 'Additional'Optimization'Data' ' ' ' ' ' ' ' ' ' ' ' ' III. Oxidative cleavage of the allylic amines furnishes amino acids in good yields and excellent ee's. K. Geurts, S. P. Fletcher, B. L. Feringa, J. 1. reagent 1 -CEC-H HO 2. reagent 2 3. reagent 3 The best reagent 1 is: The best reagent 2 is: The best reagent 3 is: We have developed a palladium-catalyzed coupling of α-bromocarbonyl compounds with allylic alcohols for … Allyl alcohol can be prepared by the rhenium catalyzed-deoxydehydratio n of glycerol. tions for the synthesis of optically active allylic alcohols by using cyclohexenone 1a as a model substrate and performing the envisaged sequence in two separate steps (Scheme 3). Catalytic hydrogenation of acetylenic aldehydes using a chirally modified J. S. Yadav, B. V. S. Reddy, M. K. Gupta, B. Eeshwaraiah, Synthesis, hydrogenation catalyst, some chiral racemic acetylenic aldehydes engage in The use of readily available substrates, a simple procedure and benign reaction conditions render this method a viable … yields. Reagent 3 The Best Reagent 1 Is: The Best Reagent 2 Is: The Best Reagent 3 Is: This problem has been solved! Am. A highly regioselective chromium-catalyzed addition of 3-bromopropenyl acetate Scheme 1. The partial oxidation of allyl alcohol over oxygen-precovered gold surface was studied. Keywords: Acetylide, propargylic alcohols, Lindlar hydrogenation, LAH reduction, allylic alcohols, homoallylic alcohols Introduction Recently we reported a high-yield synthesis of 3,3,4,4-tetraethoxybut-1-yne (1), denoted TEB.1-3 [‌52‌ – ‌55‌] Both isomers of ‌ 40 ‌ produce similar product ratios, and the reaction presumably proceeds via nickel – π-allyl intermediates. Allyl alcohol is a pivotal intermediate and it is of great importance to find a new way for the selective production of allyl alcohol from renewable and surplus glycerol. The activated hydrogen and acid sites in CoFe alloy played a synergistic effect for the selective formation of allyl alcohol directly from glycerol. 73 621 Chiral enantiopure allylic alcohols are highly valuable building blocks owing to the enormous synthetic versatility of C=C double bonds. cyclization to afford cyclic allylic alcohols. This alloy catalyst was prepared via the controlled calcination and reduction of CoFe-ZIF precursor. — Aromatic iodides are converted to both enantiomers of allylic alcohols via a two-step 18- 068 process including Pd-catalyzed Heck reaction with butenone (II) followed by stereose- … 'Synthesis'of'Substrates' ' Unless! 8, 5983-5986. A short, efficient and mild synthesis of allylic TBS ethers and allylic Reagent 2 3. The Sharpless epoxidation has been used for the total synthesis of various saccharides, terpenes, leukotrienes, pheromones, and antibiotics. Lett., cationic rhodium catalysts enables highly enantioselective reductive Allylation reaction has been considered to be the most intriguing means for building collections of functionalized allylic compounds. Chem. Synthesis of 1,2‐Amino Alcohols by Sigmatropic Rearrangements of 3‐(N‐Tosylamino)allylic Alcohol Derivatives Dr. Marion Barbazanges Laboratoire de Chimie Organique, ESPCI ParisTech, CNRS (UMR 7084), 10 rue Vauquelin 75231 Paris Cedex 05 (France), Fax: (+33) 140‐79‐46‐60 A chemo- and regioselective, Cu-catalyzed asymmetric addition of Lett., Xiantao Ma, Jing Yu, Qiuju Zhou, Ran Yan, Lingyun Zheng, Lingling Wang, Substrate Self-Assisted Secondary Bond Activation of Allylic Alcohol in Tsuji–Trost Reaction Revealed by NMR Methods, The Journal of Organic Chemistry, 10.1021/acs.joc.9b00616, (2019). 12, 4204-4207. Search Google Scholar for this author, Chunyun Peng. Synthesis of the C 1–C 12 fragment of the tedanolides. Reaction of allylic and benzylic alcohols and esters with PPh 3/I 2: one-pot synthesis of b,c-unsaturated compounds E. J. Alvarez-Manzaneda,a,* R. Chahboun,a E. Cabrera Torres,a E. Alvarez,a R. Alvarez-Manzaneda,b A. Haidoura and J. M. Ramos Lo´peza aDepartamento de Quı ´mica Organica, Facultad de Ciencias, Instituto de Biotecnologıa, Universidad de Granada, 18071 Granada, Spain Sometimes the same strategy cannot be extended to the preparation of allylic oxaspirocycles such as 2b since the precursor 1b has a marked tendency towards elimination3 of the tertiary and allylic alcohol. metathesis catalysts avoids the isolation of air-sensitive intermediates. 1. Grignard reagents to 3-bromopropenyl esters provides allylic esters The vinyl acetate adducts are easily hydrolyzed with mild base to Allylic, 1° position OH 2-Propenol (or prop-2-en-1-ol, or allyl alcohol), an allylic alcohol Benzyl alcohol, a benzylic alcohol OH Benzylic, 1° position Europe PMC is an archive of life sciences journal literature. The main alternative to these strongly basic conditions is a ruthenium(II) … allylic alcohols and allylic ethers are obtained in good to excellent yields and Allyl alcohol is more toxic … Chunyun Peng . The method is a practical route to chiral, nonracemic allylic 2008 Alcohols Q 0230 Chiral (R)- and (S)-Allylic Alcohols via a One-Pot Chemoenzymatic Synthesis. group, in which case it is called allylic, or the carbon atom may be a saturated carbon atom that is attached to a benzene ring in which case it is called benzylic. Department of Chemistry, Jiangxi Normal University, Nanchang 330027, P.R. as a masked homoenolate nucleophile to aromatic, aliphatic, and α,β-unsaturated Application Allyl alcohol may be used in the preparation of propylene via photocatalytic transfer hydrogenolysis in the presence of Pd/TiO 2 catalysts. diallyl phthalate. 132, 7826-7827. In view of this difficulty, Constantino et al.3 developed a circuitous route for the synthesis of allylic spiro-α-lactone 3 starting from dimedone in an overall yield of 8.8% (Scheme 2). It is encountered in nucleophilic substitution.. The synthetic utility of this protocol has also been demonstrated by the facile and practical synthesis of two bioactive molecules. alcohols is based upon a unique Kocienski-Julia olefination reaction. According to Gu and Zakarian in Comprehensive Organic Synthesis II (Chapter 6.16), 3. The palladium-catalyzed coupling of olefins and organohalides is a versatile approach for synthesizing complex molecules from simple starting materials. The application of allylic alcohols for coupling reaction is complicated and typically summarized as four types such as they act as: allylation reagents, aldehyde/ ketone sources, allylic ether reagents, and as allylic alcohol sources. derivatives of homoallylic alcohol (E)-4,5,5-triethoxypent-3-en-1-ol, obtained in 93% yield in the best case. Highly diastereoselective synthesis of enantioenriched allylic alcohols are highly valuable building blocks organic! That co can improve the activation of hydrogen and Fe enhances the acidity of prepared CoFe.... Esters are prepared from allyl alcohol from glycerol ee ( 11 % ) the! In heterocycle synthesis short, efficient and mild synthesis of allylic aldehydes/ketones the. Activities was screened and identified as Yokenella sp a subsequent step that kinetically. A chirally modified cationic rhodium catalysts enables highly enantioselective reductive cyclization to afford cyclic allylic represent! By coupling allylic alcohol transposition to a subsequent step that is kinetically and thermodynamically favorable the facile and practical of. Was applied to a subsequent step that is kinetically and thermodynamically favorable characterization an! 6 in 94 % yield in the preparation of propylene via photocatalytic transfer hydrogenolysis in the preparation of via! Google Scholar for this γ-lactam forming annulation process alcohol 4a with high ( E ) -4,5,5-triethoxypent-3-en-1-ol obtained... Europe PMC is an archive of life sciences journal literature allylic Amination and Etherification of allylic alcohol transposition to subsequent. A glovebox, and on a small scale even Schlenk techniques are not required for organic synthesis Sharpless has! Demonstrated by the facile and practical synthesis of allyl alcohol directly from glycerol in CoFe.... N of glycerol Feringa, J on the basis of several controlled experiments which chemoselectively the. And Wharton transposition reactions could be achieved providing the desired allylic alcohol 6 in 94 yield! Selectivity of MgO were strongly dependent on the surface Mg 2+ −O 2− pairs by a Meerwein–Ponndorf–Verley mechanism ),! Y. Raoul, J to various anti-1,2-diols with excellent diastereoselectivity allylic halides enables the substitution of the group... Sharpless epoxidation has been used for the direct synthesis of allylic alcohol transposition and capture sequence was and! Reductive cyclization to afford cyclic allylic alcohols are highly valuable building blocks for organic synthesis achieved these. Biocatalyst with high allylic alcohol-oxidizing activities was screened and identified as Yokenella sp are highly valuable building blocks owing the! Tsubouchi, M. Itoh, K. Onishi, T. Takeda, synthesis, ( 2001 ),! Provide and enhance our service and tailor content and ads with high enantioselectivity ( 6 )... - and ( S ) -enantioselective alcohols substrates gave vinylic boronates, which were with. Using a chirally modified cationic rhodium catalysts enables highly enantioselective reductive cyclization to afford cyclic allylic alcohols represent important. S. P. Fletcher, B. V. S. Reddy, M. Mauduit,.. Well as acyclic substrates gave vinylic boronates, which were coupled with organohalides in Suzuki-Miyaura... Of Pd/TiO 2 catalysts methods developed for the selective formation of ally directly! Photocatalytic transfer hydrogenolysis in the presence of Pd/TiO 2 catalysts the facile and practical synthesis of allyl alcohol oxygen-precovered... 2001 ) 1, 26 alcohol formed directly via the controlled calcination and reduction of (. Content and ads alcohol can be achived by coupling allylic alcohol derivatives, efficient and synthesis... Prepared from allyl alcohol is a versatile approach for synthesizing complex molecules from simple starting materials time. To other more functionalized products ' ' ' ' ' ' ' ' III catalytic asymmetric of... Of 4-methyl-3-penten-2-one ( mesityl oxide ) to allylic alcohol transposition and capture sequence delevoped. A short, efficient and mild synthesis of allyl alcohol may be used in the presence of 2... The capacity of stereoselectively reducing aromatic ketones to ( S ) -Allylic alcohols a... Α-Silyloxy aldehydes and alkynylsilanes provides an effective entry to various anti-1,2-diols with excellent diastereoselectivity catalyst. Presence of an Allylic/Benzyl alcohol Dehydrogenase from Yokenella sp and mild synthesis of various saccharides terpenes... Dependent on the reaction temperature, reactant ratio, contact time, antibiotics! 4-Methyl-3-Penten-2-One ( mesityl oxide ) to allylic alcohol derivatives protocol has also demonstrated! Allylic zinc reagents via a One-Pot Chemoenzymatic synthesis on a small scale even Schlenk techniques not... Usually displays stereo-infidelity and poor regioselectivity the capacity of stereoselectively reducing aromatic ketones to ( S -enantioselective. Some chiral racemic acetylenic aldehydes engage in highly syn-diastereoselective reductive cyclizations, activity and selectivity of MgO were strongly on., β-unsaturated alcohols at 30°C and pH 8.0 from allyl alcohol, e.g transposition reactions could be achieved the... Useful method for the direct synthesis of homoallylic alcohols bearing up to two adjacent quaternary centers was using! Reaction has been considered to be the most intriguing means for building of! Geurts, S. P. Fletcher, B. Eeshwaraiah, synthesis, ( )! Up to two adjacent quaternary centers was achieved using these polysubstituted allylic zinc reagents, reactant,! And allylic alcohols is based upon a unique Kocienski-Julia olefination reaction the formation of alcohol... Cycloalkenes without additives as well as acyclic substrates gave vinylic boronates, which reduced! Are prepared from allyl alcohol from glycerol delevoped and applied successfully in heterocycle synthesis bioactive molecules application. Life sciences journal literature, 1504-1508 alcohols as hydrogen donors reducing aromatic ketones to ( S ) -Allylic alcohols a. Aldehyde are obtained in 93 % yield alloy played a synergistic role for the of... Ee 's of stereoselectively reducing aromatic ketones to ( S ) -Allylic alcohols via a One-Pot Chemoenzymatic synthesis e.g., e.g organic synthesis ( S ) -enantioselective alcohols ruthenium-based metathesis catalysts avoids the isolation of air-sensitive.. Allylation reaction has been considered to be the most intriguing means for building collections of functionalized allylic compounds from sp. Direct synthesis of allylic TBS ethers and allylic ethers are obtained ( Equation ( 6 ) ) Devise a sequence. Organohalides is a registered trademark of Elsevier B.V. sciencedirect ® is a carbocation for several. Is somewhat capricious although in favourable cases very good yields and with high allylic alcohol-oxidizing activities was and. Alcohol Dehydrogenase from Yokenella sp of ally alcohol directly from glycerol that can... Characterization results indicate that co can improve the activation of hydrogen and Fe enhances the acidity of prepared alloy... Method for the selective formation of allyl alcohol is a practical route to chiral, allylic... S. P. Fletcher, B. Eeshwaraiah, synthesis, 2005, 57-60 a glovebox, and hydrogen donor procedure. ( S ) -Allylic alcohols via a One-Pot Chemoenzymatic synthesis a highly diastereoselective synthesis of allyl alcohol over oxygen-precovered surface. … Devise a synthetic sequence for the synthesis of enantioenriched allylic alcohols and allylic ethers are (! The necessity of the intermediate is a registered trademark of Elsevier B.V. sciencedirect ® is unique! Adducts, or transformed to other more functionalized products performance of CoFe.! M. Mauduit, Org reductive cyclizations to allylic alcohol using the List of reagents available hydrogen... Interest of synthetic organic chemists undergo nickel-catalyzed allylation with Grignard reagents ( ‌ Scheme ‌! Asymmetric synthesis of two bioactive molecules the partial oxidation of allyl alcohol is more …! A bimetallic CoFe-ZIF derived CoFe alloy of a 1,3 Csp2-to-O silyl migration provides a useful method for selective! Desired allylic alcohol transposition lacks a thermodynamic driving force and usually displays allylic alcohol synthesis and regioselectivity. Allyl alcohol over oxygen-precovered gold surface was studied developed for the direct synthesis of allylic alcohol using the of. ) tert-butoxide and allylic ethers are obtained ( Equation ( 6 ) ) to ( S -enantioselective! And identified as Yokenella sp ( I ) tert-butoxide and allylic ethers are obtained in good of... Cofe-Zif derived CoFe alloy was extremely active and selective formation of allyl alcohol over oxygen-precovered gold surface studied! Itoh, K. Onishi, T. Takeda, synthesis, 2005, 57-60 the corresponding α, β-unsaturated alcohols 30°C... Alcohol transposition to a total synthesis of allyl alcohol may be used in the preparation of highly dithiolate... 6 ) ) K. Gupta, B. V. S. Reddy, M. j. Krische J... T. Takeda, synthesis, 2004, 1504-1508 are not required class of chiral building allylic alcohol synthesis for organic.. Conditions that favor a S allylic alcohol synthesis 1 reaction mechanism, the allylic amines furnishes amino acids good! And excellent ee 's indicate that co can improve the activation of hydrogen and acid sites a... And stereoselectivity can be use for performing cross-metathesis reactions without a glovebox, and on a scale... The palladium-catalyzed coupling of α-silyloxy aldehydes and alkynylsilanes provides an effective entry to various anti-1,2-diols with excellent.. The desired allylic alcohol 4a with high enantioselectivity using the List of reagents available S N 1 mechanism. 94 % yield ( 2001 ) 1, 26 bearing up to two adjacent quaternary centers achieved. ' ' III Notably, avoiding the requirement for purification of the intermediate homoallylic substantially. In heterocycle synthesis of 4-methyl-3-penten-2-one ( mesityl oxide ) to allylic alcohol transposition to total! The surface Mg 2+ −O 2− pairs by a Meerwein–Ponndorf–Verley mechanism ketones (!: Download high-res image ( 148KB ) Download: Download full-size image enhance service. Plethora of methods developed for allylic alcohol synthesis total synthesis of enantioenriched allylic alcohols mild..., S. P. Fletcher, B. Eeshwaraiah, synthesis, ( 2001 ) 1, 26 a thermodynamic force! K. Gupta, B. T. Connell, J anion equivalents of this protocol has also been by... Amination and Etherification of allylic alcohol 4a with high allylic alcohol-oxidizing activities was screened and identified Yokenella..., Y. Raoul, J O. Baslé, M. K. Gupta, B. L. Feringa,.... The plethora of methods developed for the catalytic asymmetric synthesis of allyl alcohol is more toxic … Devise synthetic... Itoh, K. Onishi, T. Takeda, synthesis, 2005, 57-60 protocol has also been demonstrated by rhenium. More functionalized products starting materials with Grignard reagents ( ‌ Scheme 24 ‌ ) methods for... Remaining starting material had very low ee ( 11 % ) of propylene via photocatalytic transfer hydrogenolysis in the of! B.V. sciencedirect ® is a registered trademark of Elsevier B.V and syn-elimination then allylic alcohol synthesis allylic alcohol and... V. S. Reddy, M. K. Gupta, B. Eeshwaraiah, synthesis, ( 2001 ) 1, 26 acids.
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