Efficient condensation of p -substituted phenols, p -thiocresol and 2,7-dihydroxynaphthalene with malonaldehyde tetramethyl acetal in trifluoroacetic acid
作者:Ahmad Banihashemi、Ali Rahmatpour
DOI:10.1016/s0040-4020(99)00353-1
日期:1999.6
Condensation reactions of malonaldehyde tetramethyl acetal with p-substituted phenol derivatives and p-thiocresol have been carried out in trifluoroacetic acid and the corresponding methano-dibenzo[1,3]-dioxocins and dithiocin type compounds were obtained in good to excellent yields. In the case of condensation of 2,7-dihydroxynaphthalene with malonaldehyde tetramethyl acetal 8,16-methano-16H-dinaphtho[2
Regioselective synthesis of di-aromatic ring-fused 2,8-dioxa/dithia bicyclo[3,3,1]nonane derivatives via recyclable polymeric Brønsted acid-catalyzed one-pot tandem formation of multiple chemical C–C/C–O and C–C/C–S bonds
diverse symmetrical substituted di-aromatic-fused 2,8-dioxa/dithiabicyclo[3,3,1]nonane derivatives containing methylene-bridged bicyclic framework via reusable cross-linked polystyrene-supported p-toluenesulfonic acid-catalyzed tandem reactions of substituted phenols/selected thiophenol with 1,1,3,3-tetramethoxypropane under neat conditions has been reported in which four new chemical bonds (two C–C/two C–O)-(two
NOVEL PHOSPHINE-BASED CATALYSTS USEFUL FOR THE TELOMERIZATION OF BUTADIENE
申请人:Leeuwen Petrus Van
公开号:US20130123516A1
公开(公告)日:2013-05-16
A phosphine-based catalyst composition suitable for the telomerization of butadiene to produce 1-octene includes palladium and one of a class of novel phosphine ligands characterized by two potentially functionalized phenyl rings and a third phenyl group having an alkoxy functionality on one of the ortho-positions, which is part of a 5- or 6-membered ring between this ortho position and the adjacent meta position, this ring not being part of a second aryl group. The catalysts including this class of phosphine ligands may exhibit higher catalytic activity and selectivity, and may be used at lower temperatures, than many other phosphine ligand catalysts, reducing costs. Palladium precipitation may also be reduced.