Mass spectrometric studies of cyclopropanes with electronegative substituents. Indication of methoxy group randomization in (±) dimethyl 2-methoxy-3,3-dimethylcyclopropane-1,1-dicarboxylate
摘要:
Abstract(±) 2‐Methoxy‐3,3‐dimethylcyclopropane‐1,1‐carboxylate was studied by electron impact and chemical ionization mass spectrometry. By using selective deuteration of the methyl groups, it was established that extensive randomization of the methoxy groups takes place prior to the decomposition of the molecular ion.
Nonproductive Events in Ring-Closing Metathesis Using Ruthenium Catalysts
作者:Ian C. Stewart、Benjamin K. Keitz、Kevin M. Kuhn、Renee M. Thomas、Robert H. Grubbs
DOI:10.1021/ja1029045
日期:2010.6.30
and nonproductive metathesis reactions of diethyl diallylmalonate are compared for eight different ruthenium-based catalysts. Nonproductive cross metathesis is proposed to involve a chain-carrying ruthenium methylidene. A second more-challenging substrate (dimethyl allylmethylallylmalonate) that forms a trisubstituted olefin product is used to further delineate the effect of catalyst structure on the
A Convenient One-Step Synthesis of Ethyl 2-[<i>N</i>-(Diethoxycarbonyl)(ethoxy)-methyl]amino-4-nitrobenzoate and Analogues by Rearrangement of 2,4-Dinitrobenzylidenemalonates
作者:Stefan Kinastowski、Stanisław Wnuk
DOI:10.1055/s-1983-30462
日期:——
KINASTOWSKI, S.;WNUK, S., SYNTHESIS, BRD, 1983, N 8, 654-659