Tandem reactions of Friedel–Crafts/aldehyde cyclotrimerization catalyzed by an organotungsten Lewis acid
摘要:
The tris(2-pyridyl)phosphine complex [P(2-py)(3)W(CO)(NO)(2)](BF4)(2) acts as a Lewis acid catalyst precursor for the tandem reactions of Friedel-Crafts/aldehyde cyclotrimerization, which lead to the formation of a series of hyper-branched star polymers. (C) 2002 Elsevier Science Ltd. All rights reserved.
[EN] NITRILE COMPOUND AND ITS USE IN PEST CONTROL<br/>[FR] COMPOSE NITRILE ET SON UTILISATION POUR LE CONTROLE DES INSECTES ET ANIMAUX NUISIBLES
申请人:SUMITOMO CHEMICAL CO
公开号:WO2005063694A1
公开(公告)日:2005-07-14
The present invention provides a nitrile compound represented by the formula (I): wherein R represents C1-C4 fluoroalkyl, Q represents halogen, C1-C11 alkyl optionally substituted with halogen, C2-C6 alkenyl group optionally substituted with halogen, C2-C6 alkynyl optionally substituted with halogen, C3-C7 cycloalkyl optionally substituted with halogen or (C3-C7 cycloalkyl optionally substituted with halogen)C1-C4 alkyl, which has excellent control effect against pests.
The reactions of diphenyllithioarsine and diphenylarsine with aldehydes
作者:P.J. Busse、C-P. Hrung、K.J. Irgolic、D.H. O'Brien、F.L. Kolar、Omar A. El Seoud
DOI:10.1016/s0022-328x(00)94398-5
日期:1980.1
Diphenyllithioarsine reacts with aldehydes (RCHO, R CH2CH3, CH(CH3)2, and Ph) to form lithium salts of α-hydroxyalkylarsines. Protonation of the lithium salts gives α-hydroxyalkylarsines. Diphenylarsine reacts with aldehydes below room temperature in the absence of solvents to produce white solids. The reactions are rapid in the presence of acid catalysts. Proton and carbon-13 NMR, infrared and Raman
the direct aldol addition with high degrees of regioselectivity at the sterically more encumbered α-side of unsymmetrical ketones. The formation of quaternary stereocenters is described. Oxygen-containing ene components can also be used as starting material in these reactions. When used with aliphaticaldehydes, acetals 18 or acetals of aldol adducts 20 were observed. As few as 0.2 mol % loadings with
Acetonyltriphenylphosphonium bromide in organic synthesis: a useful catalyst in the cyclotrimerization of aldehydes
作者:Yung-Son Hon、Chia-Fu Lee
DOI:10.1016/s0040-4020(01)00588-9
日期:2001.7
Acetonyltriphenylphosphonium bromide (ATPB) is a useful catalyst for the cyclotrimerization of the aliphatic aldehydes under solvent-free condition. The aldehydes tethered with a variety of functionality such as olefin, ether, ester, bromide, azide and diester could also be cyclotrimerized under the catalysis of ATPB.
Reactions of Trimethylsilyl Isothiocyanate with Aldehydes and Acetals. Synthesis of Symmetrically and Unsymmetrically Isothiocyanato-Substituted Ethers
作者:Kozaburo Nishiyama、Makoto Oba
DOI:10.1246/bcsj.60.2289
日期:1987.6
The reactions of trimethylsilyl isothiocyanate (TMSTC) with aldehydescatalyzed by Lewis acid gave α,α′-diisothiocyanato ethers in good to excellent yields. Similarly, unsymmetrical α-isothiocyanato ethers were obtained from the reactions of TMSTC with acetals in appropriate yields.