A chelation-assisted palladium-catalyzed C═Cbond cleavage of α, β-unsaturated ketone to form alkenyl nitrile in the presence of nitrile is disclosed on the basis of a formal group-exchange reaction formulated as C1═C2 + C3 → C1═C3 + C2, differing from normal alkene oxidative cleavage and metathesis type. The isolated key active Pd(II) complex as well as deuterium-labeled experiment revealed the necessity
α的螯合辅助钯催化的C = C键的断裂,β不饱和酮向腈的存在形式烯腈,公开了一种正式基交换反应的配制为C的基础上,1 = C 2 + C 3 →C 1 = C 3 + C 2,从正常烯烃氧化裂解和复分解型不同。分离出的关键活性 Pd(II) 配合物以及氘标记实验揭示了螯合基团的必要性,并提出了一条合理的催化途径。
Catalytic Electronic Activation: Indirect “Wittig” Reaction of Alcohols
作者:Michael G. Edwards、Jonathan M. J. Williams
DOI:10.1002/anie.200290034
日期:2002.12.16
Barium Hydroxide as Catalyst in Organic Reactions; V. Application in the Horner Reaction under Solid-Liquid Phase-Transfer Conditions
作者:J. V. Sinisterra、Z. Mouloungui、M. Delmas、A. Gaset
DOI:10.1055/s-1985-31438
日期:——
A new application of a barium hydroxide catalyst for the Horner reaction is described. The scope of the synthetic method is shown; furthermore, the yields are higher and the reaction times shorter than those previously reported for similar experimental conditions (solid-liquid). Ethyl 3-(1′-pyrenyl)-acrylate and the 3-(1′-pyrenyl)-acrylonitrile are described for the first time.
The fluorescence properties of some pyrenylethylene derivatives capable of exhibiting twisted intramolecular charge transfer phenomenon havebeen studied as a function of solvent polarity. The solvent polarity dependent change in the fluorescence quantum yield has been interpreted in terms of intramolecular retational relaxations. The trans → cis photoisomerization data of the compounds indicate that