Tethers of 8 and 14 carbons in length give yields comparable to those obtained from an intermolecular control reaction while shorter tethers give reduced yields of product. However, the use of mixed tethered diesters and a crossover experiment between two different tethered substrates provides a ...
In 1977, Stetter and Dämbkes reported the first nonenzyme catalyzed cross-acyloin reaction between a range of aryl and aliphatic aldehydes.41 The conditions developed by Stetter involve treatment of an aromatic aldehyde with a threefold excess of an aliphatic aldehyde in the presence of thiazolium...
condensation reaction缩合反应 condensation region凝聚区 condensation tube冷凝管 cyclic condensation环状缩合 gravitational condensation引力凝聚 相似单词 acyloinn. [化]偶姻 condensationn. 1.[U] 凝结的水珠 2.[U](气体)冷凝;凝结 3.[U,C](书等的)简缩 ...
The transition-states of rearrangement reaction of the stable structure of F 2CCLiBr have been determined, and the potential barriers of rearrangement reactions have been obtained at B3LYP/6-31G(d,p) level. 对稳定的平衡结构 ,找到了其可能的重排反应过渡态 ,根据计算得到的重排反应势垒 ,解释了氟...
17.coupled reaction偶联反应,偶合反应 18.Pride and Prejudice --An Epitome of Jane Austen s Views of Marriage;《傲慢与偏见》——简·奥斯丁婚姻观的缩影 相关短句/例句 coupling[英]['k?pl??][美]['k?pl??]偶联,偶合 3)asymmetric benzoin condensation偶姻缩合 1.This paper is intended to delineate...
dihydro-2,3-diphenyl-1,4-dioxene and 5,6-dihydro-2,3-diphenyl-1,4-oxathiin were synthesized by the reaction of benzoin with ethylene glycol or 2-mercaptoethanol under microwave irradiation. 用微波辐照方法研究了苯偶姻与乙二醇或巯基乙醇在酸催化下的缩合反应 。 3. Dry oxidation of benzoin wi...
Both dimethylphenyl- and methyldiphenylsilyllithium were found to be effective, the latter providing greater stereocontrol. The reaction is believed to proceed via Brook rearrangement assisted by expulsion of the adjacent leaving group. A number of acyclic acyloin derivatives were reacted to form the ...
After reaction course, catalyst can be recycled and reused without any apparent loss of activity which makes this process cost effective and hence ecofriendly. Synthesized benzoins and acyloins by this method have been characterized on the basis of melting point and 1 H-NMR spectral studies....
It also can efficiently shift the reaction equilibrium during the coupled reaction as observed in our previous report when the fluorination enzyme, FlA, from Streptomyces cattleya, was investigated for a chlorination reaction [18]. Addition of LAAO into the aforementioned enzyme system led to the ...
Protonation then gives an acyloin, an α-hydroxy ketone, in which two atoms which were originally the carbon atoms of the ester carbonyl groups are joined by a new single carbon–carbon bond. This coupling reaction, in both its intermolecular mode (Scheme 1) and, particularly, in its ...