bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Regio‐ and Stereoselective Selenium Dioxide Allylic Oxidation of (E)‐Dialkyl Alkylidenesuccinates to (Z)‐Allylic Alcohols: Synthesis of Natural and Unnatural Butenolides.
Authors: Patel Ramesh M. , Puranik Vedavati G. , Argade Narshinha P. 
Published: January 2012

AbstractThe butenolides are formed via an exceptional (E)‐ to (Z)‐carbon—carbon double bond isomerization of the starting succinates.
ChemInform Abstract: Chiral Squaramide‐Catalyzed Enantioselective Conjugate Michael Addition of Various Thiols to α,β‐Unsaturated N‐Acylated Oxazolidin‐2‐ones.
Authors: Dai Le , Yang Hongjun , Chen Fener 
Published: January 2012

AbstractTitle reaction proceeds with high to excellent enantioselectivities (up to 99% e.e.) for a variety of α,β‐unsaturated N‐acyloxazolidinones and thiols.
ChemInform Abstract: Copper‐Catalyzed Trifluoromethylation of Unactivated Olefins.
Authors: Parsons Andrew T. , Buchwald Stephen L. 
Published: January 2012

AbstractReaction of various unactivated olefins with Togni electrophilic trifluoromethylation reagent (I) proceeds under mild conditions to afford (E)‐isomers predominantly.
ChemInform Abstract: Ruthenium—Alkylidene Catalyzed Cross‐Metathesis of Fatty Acid Derivatives with Acrylonitrile and Methyl Acrylate: A Key Step Toward Long‐Chain Bifunctional and Amino Acid Compounds.
Authors: Miao X. , Malacea R. , Fischmeister C. , Bruneau C. , Dixneuf P. H. 
Published: January 2012

AbstractA protocol for the ruthenium‐catalyzed cross‐metathesis of fatty‐esters from plant oils and optimized experimental parameters for the individual substrates are presented.
ChemInform Abstract: Synthesis of Activated Cyclopropanes by an MIRC Strategy: An Enantioselective Organocatalytic Approach to Spirocyclopropanes.
Authors: Russo Alessio , Meninno Sara , Tedesco Consiglia , Lattanzi Alessandra 
Published: January 2012

AbstractCyclopropanation of arylideneindandiones (I) and arylidenemalononitriles (IV) is efficiently achieved applying α‐bromomalonate or related active methylene compounds (II) in a Michael‐induced ring closing strategy.
ChemInform Abstract: Regioselective Synthesis of 1,3,5‐Substituted Benzenes via the InCl3/2‐Iodophenol‐Catalyzed Cyclotrimerization of Alkynes.
Authors: Xu Yan‐li , Pan Ying‐ming , Wu Qiang , Wang Heng‐shan , Liu Pei‐zhen 
Published: January 2012

AbstractThe new, efficient, and widely applicable method to prepare 1,3,5‐substituted benzenes can also be used for the synthesis of some hexasubstituted benzenes.
ChemInform Abstract: Palladium(II)‐Catalyzed Selective Monofluorination of Benzoic Acids Using a Practical Auxiliary: A Weak‐Coordination Approach.
Authors: Chan Kelvin S. O. , Wasa Masayuki , Wang Xisheng , Yu Jin‐Quan 
Published: January 2012

AbstractDifluorinated products can also be prepared under similar conditions by simply changing the stoichiometry of the fluorinating agent.
ChemInform Abstract: Synthesis of Trifluoroethyl‐Substituted Ketones from Aldehydes and Cyclohexanones.
Authors: Morandi Bill , Carreira Erick M. 
Published: January 2012

AbstractThe new approach includes diazotation of trifluoroethylamine (I) followed by ZrCl4‐promoted reaction of the resulting trifluorodiazoethane with aldehydes.
ChemInform Abstract: Preparation of Aryl Azides from Aromatic Amines in N‐Methyl‐2‐pyrrolidonium Bisulfate.
Authors: Hajipour Abdol Reza , Mohammadsaleh Fatemeh 
Published: January 2012

AbstractAn efficient and simple method for the diazotation and azidation of various aromatic amines using the ionic liquid NMP·H2SO4 as solvent and novel proton source for the diazotation process is presented.
ChemInform Abstract: Direct Asymmetric α‐Allylation of Aldehydes with Simple Allylic Alcohols Enabled by the Converted Action of Three Different Catalysts.
Authors: Jiang Gaoxi , List Benjamin 
Published: January 2012

AbstractThe stereoselectivity is generated by (S)‐TRIP ligand with Pd(PPh3)4 catalyst and an arylamine as co‐catalyst.
ChemInform Abstract: Regioselective ortho‐Acetoxylation/Methoxylation of N‐(2‐Benzoylphenyl)benzamides via Substrate Directed C—H Activation.
Authors: Reddy B. V. Subba , Revathi G. , Reddy A. Srinivas , Yadav J. S. 
Published: January 2012

AbstractThe title reactions can be carried out with success under conditions A).
ChemInform Abstract: Pd‐Catalyzed Highly Regio‐ and Stereocontrolled Direct Alkenylation of Electron‐Deficient Polyfluoroarenes.
Authors: Chen Fei , Zhang Xingang 
Published: January 2012

AbstractAn efficient and reliable method for the synthesis of the compounds (III), (V), (VII), and (IX) is presented.
ChemInform Abstract: Binuclear Fe‐Complexes as Catalysts for the Ligand‐Free Regioselective Allylic Sulfenylation.
Authors: Holzwarth Michael S. , Frey Wolfgang , Plietker Bernd 
Published: January 2012

AbstractBinuclear Fe‐complexes are prepared and applied as potent catalysts for the regioselective allylic sulfenylation.
ChemInform Abstract: Palladium‐Catalyzed Carbon—Sulfur Cross‐Coupling Reactions of Aryl Chlorides with Indium Tris(organothiolates).
Authors: Mo Juntae , Eom Dahan , Kim Sung Hong , Lee Phil Ho 
Published: January 2012

AbstractThe presented title reaction proceeds with aryl chlorides bearing an electron‐withdrawing group, also in the presence of the labile ethoxycarbonyl and formyl groups, cf.
ChemInform Abstract: Practical and Stereoselective Synthesis of β‐Amino Sulfones from Alkyl Phenyl Sulfones and N‐(tert‐Butylsulfinyl) Aldimines.
Authors: Zhang Hua , Li Ya , Xu Wei , Zheng Wenrui , Zhou Pei , Sun Zhihua 
Published: January 2012

AbstractThe title reaction can be applied to non‐enolizable, enolizable, aromatic, and heterocyclic imines and affords the corresponding amino sulfones in high yields and diastereoselectivities.
ChemInform Abstract: Pd/C‐Catalyzed and Water‐Mediated Hiyama Cross‐Coupling Reaction Using an Electron‐Deficient Phosphine Ligand.
Authors: Yanase Takayoshi , Mori Shigeki , Monguchi Yasunari , Sajiki Hironao 
Published: January 2012

AbstractThe addition of a small amount of water to anhydrous toluene as the solvent in the title reaction between aryl halides(I) and aryltrialkoxysilanes (II) significantly enhances the reaction efficiency.
ChemInform Abstract: Asymmetric Additive‐Free Aryl Addition to Aldehydes Using Perhydrobenzoxazines as Ligands and Boroxins as Aryl Source.
Authors: Infante Rebeca , Nieto Javier , Andres Celia 
Published: January 2012

AbstractThe enantiocontrol of the title reaction is not significantly influenced by electronic effects or steric hindrance.
ChemInform Abstract: Ligand‐Free Fe—Cu Cocatalyzed Cross‐Coupling of Terminal Alkynes with Aryl Halides.
Authors: Panda Niranjan , Jena Ashis Kumar , Mohapatra Sasmita 
Published: January 2012

AbstractThe heterogeneous magnetic catalytic system for the C—C cross‐coupling of alkynes (I) with aryl halides (II) and (IV) exploits the synergistic effects of iron and copper in copper ferrite nanoparticles for the alkynylation reaction.
ChemInform Abstract: Synthesis of Iron(III) Complex Bearing Tridentate β‐Aminoketonato Ligand: Application to Iron‐Catalyzed Cross‐Coupling Reaction of Arylmagnesium Bromides with Alkyl Halides.
Authors: Yamaguchi Yoshitaka , Ando Hiroaki , Nagaya Makoto , Hinago Hideto , Ito Takashi , Asami Masatoshi 
Published: January 2012

AbstractThe iron complex acts as an efficient catalyst for the title reaction by a simple procedure without an additive and within short reaction time.
ChemInform Abstract: Cross‐Coupling of Aryl/Alkenyl Silyl Ethers with Grignard Reagents Through Nickel‐Catalyzed C—O Bond Activation.
Authors: Zhao Fei , Yu Da‐Gang , Zhu Ru‐Yi , Xi Zhenfeng , Shi Zhang‐Jie 
Published: January 2012

AbstractThe investigation of title reaction, which provides a new strategy of silyl protection/C‐C bond formation sequence, is presented.
ChemInform Abstract: Palladium‐Catalyzed Selective Carboelimination and Cross‐Coupling Reactions of Benzocyclobutenols with Aryl Bromides.
Authors: Chtchemelinine Andrei , Rosa David , Orellana Arturo 
Published: January 2012

AbstractThe method provides a new and efficient approach to 2‐functionalized biaryls.
ChemInform Abstract: N‐Heterocyclic Carbene Catalysis: Enantioselective Formal [2 + 2] Cycloaddition of Ketenes and N‐Sulfinylanilines.
Authors: Jian Teng‐Yue , He Lin , Tang Cen , Ye Song 
Published: January 2012

AbstractThe use of PGT and IOT as chiral catalysts allows the highly enantioselective synthesis of both enantiomers (III).
ChemInform Abstract: Carbon Dioxide Triggered and Copper‐Catalyzed Domino Reaction: Efficient Construction of Highly Substituted 3(2H)‐Furanones from Nitriles and Propargylic Alcohols.
Authors: Qi Chaorong , Jiang Huanfeng , Huang Liangbin , Yuan Gaoqing , Ren Yanwei 
Published: January 2012

AbstractThe reaction is triggered by cycloaddition of CO2, where one of the oxygens is incorporated into the furanone structure.
ChemInform Abstract: Synthesis and Biological Evaluation of Phenoxy‐N‐phenylacetamide Derivatives as Novel P‐Glycoprotein Inhibitors.
Authors: Lee Kyeong , Roh Sang Hee , Xia Yan , Kang Keon Wook 
Published: January 2012

AbstractNew phenoxy‐N‐phenylacetamide derivatives are synthesized and evaluated for their ability to inhibit P‐glycoprotein.
ChemInform Abstract: Enantioselective Organocatalytic Friedel—Crafts Alkylation Reaction of Indoles with 5‐Hydroxyfuran‐2(5H)‐one: Access to Chiral γ‐Lactones and γ‐Lactams via a Ugi 4‐Center 3‐Component Reaction.
Authors: Riguet Emmanuel 
Published: January 2012

AbstractThe prolinol‐catalyzed treatment of indoles with the furanone (II) followed by reduction and lactonization provides an efficient approach to chiral lactones of type (III) and (IX).
ChemInform Abstract: A Gold(I)‐Catalyzed Intramolecular Oxidation—Cyclopropanation Sequence of 1,6‐Enynes: A Convenient Access to [n.1.0]Bicycloalkanes.
Authors: Qian Deyun , Zhang Junliang 
Published: January 2012

AbstractA gold(I)‐catalyzed intramolecular oxidation—cyclopropanation sequence of enynes, e.g. (I), (III) and (V) with pyridine N‐oxide or 8‐methylquinoline N‐oxide as external oxidant is described.
ChemInform Abstract: An Efficient Synthesis of 5‐Aryl‐4,5‐dihydro‐3‐(5‐methyl‐1‐p‐tolyl‐1H‐1,2,3‐triazol‐4‐yl)‐1‐ (4‐phenylthiazol‐2‐yl)pyrazoles.
Authors: Dong Wang‐Jun , Cui Fu‐Hong , Gao Zhong‐Lian , Li Rong‐Shan , Shen Guo‐Liang , Dong Heng‐Shan 
Published: January 2012

AbstractAll products are purified by recrystallization from ethanol.
ChemInform Abstract: Generation of Diverse 2‐Pyrones via Palladium‐Catalyzed Site‐Selective Suzuki—Miyaura Couplings of 3‐Bromo‐4‐tosyloxy‐2‐pyrone.
Authors: Lei Xiaoli , Gao Liang , Ding Qiuping , Peng Yiyuan , Wu Jie 
Published: January 2012

AbstractThe title method is based on the different reactivity of the halide and pseudohalide substituents at pyrone (I).
ChemInform Abstract: Synthesis of Heterocyclic Derivatives of Alkyl 2‐(Cyanomethyl)‐4‐methyl‐3‐quinolinecarboxylates.
Authors: Degtyarenko Alexey S. , Tolmachev Andrey A. , Volovenko Yulian M. 
Published: January 2012

AbstractMost of the products are purified by recrystallization.
ChemInform Abstract: Direct Enantioselective Access to 4‐Substituted Tetrahydroquinolines by Catalytic Asymmetric Transfer Hydrogenation of Quinolines.
Authors: Rueping Magnus , Theissmann Thomas , Stoeckel Mirjam , Antonchick Andrey P. 
Published: January 2012

AbstractThe applied hydrogenation protocol offers convenient access to a broad range of chiral 4‐substituted tetrahydroquinolines with high enantioselectivity under mild and metal‐free reaction conditions.
ChemInform Abstract: Tandem Palladium/Charcoal‐Copper(I) Iodide (Pd/C—CuI) Catalyzed Sonogashira Coupling and Intramolecular Cyclization from 2‐Bromonicotinic Acid (= 2‐Bromopyridine‐3‐carboxylic Acid) and Ethynylarenes to 4‐Azaphthalides (= Furo[3,4‐b]pyridin‐5(7H)‐ones) and 5‐Azaisocoumarins (= 5H‐Pyrano[4,3‐b]pyridin‐5‐ones).
Authors: Begouin Agathe , Queiroz Maria‐Joao R. P. 
Published: January 2012

AbstractThe tandem Sonogashira coupling—cyclization of bromonicotinic acid (I) with (het)arylethynes (II) and (V) provides access to a mixture of azaphthalides (III), (VI) and azacoumarins (IV), (VII), resp., due to competing 5‐exo‐dig and 6‐endo‐dig cyclization pathways.
ChemInform Abstract: Highly Efficient, Chemoselective Syntheses of 2‐Methoxy‐4‐substituted Pyrimidines.
Authors: Xu Chunyan , Cheng Chuanjie , Liu Hongtao , Liu Bo 
Published: January 2012

AbstractThe compound (I) can be easily prepared from commercially available 2,4‐dichloropyrimidine.
ChemInform Abstract: Unprecedented Intramolecular [3 + 2] Cycloadditions of Azido‐Ketenimines and Azido‐Carbodiimides. Synthesis of Indolo[1,2‐a]quinazolines and Tetrazolo[5,1‐b]quinazolines.
Authors: Alajarin Mateo , Bonillo Baltasar , Ortin Maria‐Mar , Orenes Raul‐Angel , Vidal Angel 
Published: January 2012

AbstractA series of azido‐ketenimines (V) and azido‐carbodiimines (XII) is prepared.
ChemInform Abstract: Highly Diastereoselective Vinylogous Mukaiyama Aldol Reaction of α‐Keto Phosphonates with 2‐(Trimethylsilyloxy)furan Catalyzed by Cu(OTf)2.
Authors: Yu Jipan , Zhao Xiaona , Miao Zhiwei , Chen Ruyu 
Published: January 2012

AbstractA wide range of stereoselective novel functionalized tertiary α‐hydroxy phosphonates are obtained in high yields with good to excellent diastereoselectivities.
ChemInform Abstract: Reactions of Imidoyl Isoselenocyanates with Aromatic 2‐Amino N‐Heterocycles and 1‐Methyl‐1H‐imidazole.
Authors: Zhou Yuehui , Linden Anthony , Heimgartner Heinz 
Published: January 2012

AbstractNew Se‐containing heterocycles are synthesized by reaction of isoselenocyanates with various amidine‐like molecules.
ChemInform Abstract: Fuscoside E: A Strong Antiinflammatory Diterpene from Caribbean Octocoral Eunicea fusca.
Authors: Reina Eduardo , Puentes Carlos , Rojas Juan , Garcia Josue , Ramos Freddy A. , Castellanos Leonardo , Aragon Marcela , Ospina Luis F. 
Published: January 2012

AbstractA new diterpene, fuscoside E (I), is isolated along with two known fuscosides, (+)‐germacrene and a mixture of six known sterols from the Caribbean octocoral Eunicea fusca. The new diterpene (I) and one of the known fuscosides show strong anti‐inflammatory activity.
ChemInform Abstract: Pimarane Diterpenes from the Endophytic Fungus Eutypella sp. BCC 13199.
Authors: Isaka Masahiko , Palasarn Somporn , Prathumpai Wai , Laksanacharoen Pattiyaa 
Published: January 2012

AbstractTwo new pimarane‐type diterpenes named eutypellones A (I) and B (II) are isolated from the endophytic fungus Eutypella sp.
ChemInform Abstract: (+)‐Flavipucine (I), the Missing Member of the Pyridione Epoxide Family of Fungal Antibiotics
Authors: Loesgen Sandra , Bruhn Torsten , Meindl Kathrin , Dix Ina , Schulz Barbara , Zeeck Axel , Bringmann Gerhard 
Published: January 2012

Abstractisolation, structure elucidation, and screening of antimicrobial activity
ChemInform Abstract: Synthesis and Evaluation of Antioxidant, Antiinflammatory and Antiulcer Activity of Conjugates of Amino Acids with Nifedipine.
Authors: Subudhi Bharat Bhusan , Sahoo Shakti Prasanna 
Published: January 2012

Abstract10 Compounds of type (I) are prepared and evaluated for their in vitro antioxidant, anti‐inflammatory and antiulcer activities.
ChemInform Abstract: Discovery of PF‐184563, a Potent and Selective V1a Antagonist for the Treatment of Dysmenorrhoea. The Influence of Compound Flexibility on Microsomal Stability.
Authors: Ryckmans Thomas , et al. et al. 
Published: January 2012

AbstractVarying a known but highly lipophilic and metabolically unstable lead, a series of derivatives with a reduced number of rotable bonds are synthesized in order to decrease cytochrome P450‐mediated metabolism.
Comprehensive Photophysical Behaviour of Ethynyl Fluorenes and Ethynyl Anthracenes Investigated by Fast and Ultrafast Time‐Resolved Spectroscopy
Authors: Carlotti Benedetta , Flamini Rebecca , Spalletti Anna , Marrocchi Assunta , Elisei Fausto 
Published: January 2012

AbstractDetailed investigations by time‐resolved transient absorption and fluorescence spectroscopies with nano‐ and femtosecond time resolutions are carried out with the aim of characterising the lowest excited singlet and triplet states of three ethynyl fluorenes (1–3) and three ethynyl anthracenes (4–6) in solvents of different polarity. The solvent is found to modify the deactivation pathways of the lowest excited singlet state of compounds 1–4, thus changing their fluorescence, intersystem crossing and internal conversion efficiencies. The fluorescence and triplet yields gradually decrease, while the internal conversion quantum yield increases upon increasing the solvent dielectric constant. These experimental results, coupled with the marked fluorosolvatochromic effect, point to the involvement of an emitting state with a charge‐transfer (CT) character, strongly stabilised by polar solvents. This is proved by ultrafast spectroscopic studies in which two transients, distinguished by characteristic spectral shapes assigned to locally excited (LE) and CT states, are detected, the CT state being the longer lived and fluorescent one in highly polar solvents. The intramolecular LE→CT process, operative in highly polar media, becomes particularly fast (up to ≈300 fs) in the case of the NO2 derivative 1. No push–pull character is found for 5 and 6, which exhibit different photophysical behaviour; indeed, the solvent polarity does not modify significantly the dynamics of the lowest excited singlet states. Quantum mechanical calculations at the TDDFT level are also used to determine the state order and nature of the lowest excited singlet and triplet states and to rationalise the different photophysical behaviour of fluorine and anthracene derivatives, particularly concerning the intersystem crossing process.
Properties of Oligothiophene Dendrimers as a Function of Molecular Architecture and Generation Number
Authors: Córdova‐Mateo Esther , Rodríguez‐Ropero Francisco , Bertran Oscar , Alemán Carlos 
Published: January 2012

AbstractDensity functional and time‐dependent density functional calculations using the B3LYP method combined with the 6‐31G(d) and 6‐311++G(d,p) basis sets are performed on symmetric and unsymmetric all‐thiophene dendrimers containing up to 45 thiophene rings. Calculations consider both the neutral and the oxidized states of each dendrimer. The results are used to examine the molecular geometry, the ionization potential, the lowest π–π* transition energy, and the shape of the frontier orbitals. The molecular and electronic properties of these systems depend not only on the number of thiophene rings, as typically occurs for linear oligothiophenes, but also on their symmetric/unsymmetric molecular architecture. Two mathematical models developed to predict the lowest π–π* transition energy of all‐thiophene dendrimers that are inaccessible to quantum mechanical calculations are tested on a dendrimer with 90 thiophene rings.
In Situ Formation of One‐Dimensional Assemblies of Gold Nanoparticles in Confined Media
Authors: Carballido‐Landeira Jorge , Goy‐López Sonia , Muñuzuri Alberto P. , Taboada Pablo , Mosquera Víctor 
Published: January 2012

AbstractThe spontaneous in situ formation of one‐dimensional (1D) assemblies of gold nanoparticles (NP) in oleylamine/bis(2‐ethylhexyl) sulfosuccinate sodium salt/water/octane (OAm/AOT/w/o) microemulsions by exploiting both the aurophilic bonding between OAm and gold salt, and the interactions between OAm and AOT surfactant is presented. Control on the structure of the resulting assemblies is achieved by changing in the solvent quality, the [Au]/[AOT] molar ratio and the presence of different cosolutes. A possible mechanism of the formation of the 1D parallel Au NP arrays is proposed.
Adaptive packet scheduling for the uplink traffic in IEEE 802.16e networks
Authors: Teixeira Marcio Andrey , Guardieiro Paulo Roberto 
Published: January 2012

SUMMARYIEEE 802.16e is a telecommunication standard technology designed to support a wide variety of multimedia applications. It defines five service classes, each one with its respective QoS requirements, but does not define the scheduling algorithm for these service classes. In this paper, an adaptive packet scheduling algorithm for the uplink traffic in IEEE 802.16e networks is proposed. This algorithm is designed to be completely dynamic, mainly in networks that use various modulation and coding schemes (MCSs). The algorithm is applied directly to the bandwidth request queues in the base station (BS) and aims at supporting the real‐time and non‐real‐time applications. Using a cross‐layer approach and the states of the bandwidth request queues in the BS, a new deadlines based scheme was defined, aiming at limiting the maximum delay to the real‐time applications. Moreover, this algorithm interacts with the polling management mechanisms of the BS and controls the periodicity of sending unicast polling to the real‐time and non‐real‐time service connections, in accordance with the QoS requirements of the applications. The proposed algorithm was evaluated by means of modeling and simulation in environments where various MCSs were used and also in environments where only one type of modulation was used. The simulations showed satisfactory results in both environments. Copyright © 2012 John Wiley & Sons, Ltd.
Syntheses and Structural Study of Novel Tetranuclear Bis(phenoxido)‐Bridged CuII Metal–Organic Macrocycles
Authors: Riisiö Antti , Hänninen Mikko M. , Sillanpää Reijo 
Published: January 2012

AbstractSix new tetranuclear copper(II) complexes were prepared exploiting novel ditopic alkylenediamine‐N,N,N′,N′‐tetraphenolate ligands. The geometrical parameters of the compounds can be varied by introducing different solvents of crystallization into the lattice. The structures of all six complexes were determined from single‐crystal X‐ray diffraction analyses and the magnetic properties of the complexes were estimated by computational DFT calculations. The relationship between the magnetic exchange coupling constant (J) and the Cu–O–Cu angle (θ) in these bis(phenoxido)‐bridged complexes was investigated and a magnetostructural correlation was established between J and the θ angle. All studied complexes showed strong antiferromagnetic behaviour.
The Oxy‐Cope Rearrangement of Aldol Products. A Combined Experimental and Theoretical Study
Authors: Weise Christian F. , Immel Stefan , Richter Frank , Schneider Christoph 
Published: January 2012

AbstractThe oxy‐Cope rearrangement of aldol products has been studied both experimentally and theoretically to gain insight into the aspects that are responsible for the exceptional rate and diastereoselectivity of this process. Kinetic studies as well as DFT calculations convincingly show that the activation barrier of this process is mainly dependent on the electronic nature of the oxy‐substituent, with electron‐withdrawing O‐substituents raising this barrier. The diastereoselectivity, however, remains uniformly high for all derivatives investigated and steric factors are proposed to account for the selectivity to a large extent. The poor diastereoselectivity in the case of the anti‐aldols was also found in our calculations and it appears to result from unfavorable gauche interactions between the oxy and carboximide groups in the transition state.