Electrophilicity Parameters of 5-Benzylidene-2,2-dimethyl[1,3]dioxane-4,6-diones (Benzylidene Meldrum's Acids)
作者:Oliver Kaumanns、Herbert Mayr
DOI:10.1021/jo702590s
日期:2008.4.1
electrophilicity parameters for various β,β-acceptor substituted styrenes and thus to predict a large number of absoluterate constants for a manifold of Michael additions. The reactions of primary and secondary amines are approximately 2 orders of magnitude faster than predicted by the correlation (1), supporting transition states which are stabilized by hydrogen bridges from NH to the carbonyl groups of
A novel general method for the synthesis of nitrones by reaction of nitroso compounds with anions of aliphatic nitro compounds
作者:I. M. Lyapkalo、S. L. Ioffe、Yu. A. Strelenko、V. A. Tartakovsky
DOI:10.1007/bf01431312
日期:1996.4
Anions of aliphaticnitrocompounds R1R2C=NO2− react with nitroso compounds RNO to give nitrones R1R2C=N(O)R. Salts of nitrocompounds with metals and Et3N, as well as trimethylsilyl nitronates in the presence of F−, can serve as the sources of the anions. The structure of the nitrones was established by NMR spectroscopy. 1,3-Dipolar cycloaddition of a series of the nitrones obtained to olefins was