Cycloaddition of cyclic vinyl ethers to an isoquinolinium salt: application to the preparation of a model C-naphtylgycoside
作者:Richard W. Franck、Ram B. Gupta
DOI:10.1039/c39840000761
日期:——
The cycloaddition of cyclic enol ethers, including sugar glycals, to 2-(2,4-dinitrophenyl)isoquinolinium chloride leads to new substituted naphthaldehydes in useful yields.
1,2-Bis(trifluoromethyl)ethene-1,2-dicarbonitrile: Enol Ethers and Ketene Acetals as Cycloaddition Partners
作者:Rolf Huisgen、Gonzalo Urrutia Desmaison
DOI:10.1002/hlca.201200217
日期:2012.7
19F‐NMR data served the structural assignment and the quantitative analysis. The mechanistic discussion is based on rotations and ring closures of the assumed 1,4‐zwitterionic intermediates. Dimethylketene dimethyl acetal, methylketene dimethyl acetal, and ketene diethyl acetal show an increasing rate in their reactions with BTE as well as in the equilibration of the cycloadducts.
Reaction of vinyl- and propenyl-ethers with tert-butoxyl radicals - an ESR study
作者:Hans-Gert Korth、Reiner Sustmann
DOI:10.1016/s0040-4039(00)98834-8
日期:1985.1
Photolytically generated tert-butoxyl radicals react with vinyl- and propenyl ethers by hydrogen abstraction and addition to the double bond; the abstraction/addition ratio and the regioselectivity of addition are interpreted in terms of predominant steric interactions.
Double-bond migration of allylicalcohols and allylic alkyl ethers was catalytically effected with trans-Mo(N2)2(dpe)2(dpe = Ph2PCH2CH2PPh2). Decarbonylation occurred simultaneously in the case of allyl alcohol. Diallyl ether and allyl phenol ether gave the fragmentation products presumably through initial oxidative addition of the allylO bond. Allylamine was converted to N-propylideneallylamine and
of 1-methylcyclohexyl acetate-2,2,6,6-d4, the deuterium isotope effect for the acetate pyrolysis reaction has been determined to be 1·7 at 500° and 1·9 at 400°. These values are to be compared with the theoretical maximum values of 2·1 and 2·3 respectively. By carrying out competitive pyrolyses it has been possible to determine some relative rates of pyrolysis which show that no appreciable positive