Unusual borane addition to conjugated dienylphosphanes under frustrated Lewis pair conditions
作者:Sergei Krupski、Gerald Kehr、Constantin G. Daniliuc、Gerhard Erker
DOI:10.1039/c5dt03879k
日期:——
Dimesitylphosphinoisoprene reacts with a series of R-B(C6F5)2 boron Lewis acids by isomerization and subsequent 1,4-P/B addition to give the corresponding heterocyclic phosphonium/borate zwitterionic products.
Borata-Wittig olefination reactions of ketones, carboxylic esters and amides with bis(pentafluorophenyl)borata-alkene reagents
作者:Tongdao Wang、Sonja Kohrt、Constantin G. Daniliuc、Gerald Kehr、Gerhard Erker
DOI:10.1039/c7ob01591g
日期:——
PhCH2CH2–). They underwent “non-classical” borata-Wittig olefination reactions with ethylformate to give the respective enolether carbonylation products, or their C1-elongated aldehydes (after hydrolysis). The borata-alkene [Ph–(CH2)2–CHB(C6F5)2−] [Li+HTMP] (16a) gave the respective “non-classical” borata-Wittig olefination products, the enolethers 25a,b and 27, respectively, upon treatment with methyl- or ethyl