作者:Elena Cabianca、Florence Chéry、Patrick Rollin、Sergio Cossu、Ottorino De Lucchi
DOI:10.1055/s-2001-18757
日期:——
Addition-elimination of an alcohol to 1,2-bis(phenylsulfonyl)ethylene afforded β-alkoxyvinyl sulfones which were submitted to reductive elimination with 6% sodium amalgam to produce the corresponding ethenyl ethers in high yields and purity.
<i>N</i>,<i>N</i>-Dimethylformamide-stabilised palladium nanoparticles combined with bathophenanthroline as catalyst for transfer vinylation of alcohols from vinyl ether
We report N,N-dimethylformamide-stabilised Pd nanoparticle (Pd NP)-catalysed transfervinylation of alcohols fromvinyl ether. Pd NPs combined with bathophenanthroline exhibited high catalytic activity. This reaction proceeded with low catalyst loading and the catalyst remained effective even after many rounds of recycling. The observation of the catalyst using transmission electron microscopy and
for the preparation of 1-acyl-4-alkoxy- or 1-acyl-4-alkylsulfanylnaphthalenes has been developed by the PtCl 2 -catalyzed reaction of O-ethynylbenzoates or benzothioates with vinyl ethers. Treatment of O-alkynylbenzoate derivatives with PtCl 2 generated the platinum(II)-containing carbonyl ylides as a key reactive intermediate and these species reacted with vinyl ethers to give substituted naphthalenes
Benzyl vinylethers have selectively been arylated at either α or β position by fine-tuned Heck-type palladium catalyses. In contrast to previous protocols, no excess of arylating reagent or substrate chelation is necessary. For achieving good yields and high α/β-selectivities various factors determining the catalytic system had to be optimized. The results of DFT computational studies correlate selectivity