Synthesis of aldehydes by a one-carbon homologation of ketones and aldehydes via α,β-unsaturated isocyanides
作者:Janusz Moskal、Albert M. van Leusen
DOI:10.1002/recl.19871060501
日期:——
Ketones and aldehydes react via a Wittig-Horner-Emmons reaction using diethyl (isocyanomethyl)phosphonate to form α,β-unsaturated isocyanides (4), which are either hydrolyzed as such, under acid conditions, or hydrolyzed after oxidation to α,β-unsaturated isocyanides (6) to give aldehydes containing one additional carbon atom. The scope of the reaction is demonstrated by 20 examples.
A unique and highly remarkable boron Trifluoride catalyzed rearrangement Of 2,2-di-t-butyloxirane into 2,2,3,3,4,4-hexamethyltetrahydrofuran
作者:Norbert De Kimpe、Laurent De Buyck、Roland Verhé、Niceas Schamp
DOI:10.1016/0040-4020(84)85013-9
日期:1984.1
-The borontrifluoridecatalyzedrearrangement of 2,2-di-t-butyloxirane, involving competitive reactions of transient carbenium ions, could be selectively directed towards either 2,2,3,3,4,4- hexamethyltetrahydrofuran or 2-t-butyl-2,3-dimethyl-3-buten-1-ol. Hydride shift to afford 2,2-di-t-butylacetaldehyde was only observed to a minor extent.
Acyl radicals: the relationship between electron spin resonance spectra, structure, and stability in a family of σ-radicals
作者:Alwyn G. Davies、Roger Sutcliffe
DOI:10.1039/p29800000819
日期:——
and unsaturated acylradicals, RĊO, have been generated in fluid solution, principally by the photolysis of di-t-butyl peroxide in the presence of the corresponding aldehyde. Most of the acylradicals show well-resolved hyperfine splittings, and the values of a(Hβ) correlate with the n.m.r. coupling constants 3J(CHCHO) in the parent aldehyde. It is concluded that the acylradicals and the corresponding