Hydrogenfluoride is a basic fluorinating reagent, but handling it is difficult. For this reason, some modified fluorinating reagents such as HF-pyridine, Et3N-HF, and poly(hydrogenfluoride) complex have been developed. Those reagents, however, still require aqueous work-up procedures which generate hydrogenfluoride. Recently, ionic liquids have received much attention because of the ease in handling
Catalytic activities of dicyanoketene acetals in alcoholysis of epoxides.
作者:Tsuyoshi MIURA、Yukio MASAKI
DOI:10.1248/cpb.43.523
日期:——
The catalytic activity of various types of capto-dative ethylenes has been investigated on alcoholysis of epoxides, and dicyanoketene dimethyl acetal (DCKDMA) and dicyanoketene ethylene acetal (DCKEA) are found to be efficient and mild catalysts.
Substrate-Specific Rearrangement and Acetonidation of Epoxy-Ethers Catalyzed by Tetracyanoethylene
作者:Yukio Masaki、Tsuyoshi Miura、Masahito Ochiai
DOI:10.1246/cl.1993.17
日期:1993.1
providing carbonyl compounds was catalyzed by tetracyanoethylene (TCNE) in acetonitrile under the preferential anchimetric assistance of intramolecular etheric oxygen function in the 5-exo mode for the 1,2-disubstituted epoxide unit and in the quaternary 5-exo, 5-endo, and 6-endo mode for the trisubstituted type. In acetone, epoxy-ethers favored by neighboringgroupparticipation were led to carbonyl compounds
Unusual reactivity of selenoboranes towards epoxides: new selective routes to b-hydroxyselenides and allylalcohols
作者:A. Cravador、A. Krief
DOI:10.1016/s0040-4039(01)92941-7
日期:1981.1
Preparation of epoxides by oxidative decarboxylation of .beta.-hydroxy acids. Stereo- and regiochemistry of oxidative elimination of secondary radicals with cupric acetate