Methyl group migration in the reactions of alkynyltrialkylborates
作者:Andrew Pelter、Robert A. Drake
DOI:10.1016/s0040-4039(00)80450-5
日期:1988.1
It is shown that the methyl group cannot be used as a cheap, non-migrating group in the reactions of alkynyltrialkylborates with electrophiles. However, trimethylborane can be used as a methylboronating agent for alkynes, given the right choice of solvent, and this may be of use in terpene synthesis.
Rearrangement of trisubstituted epoxides has been effected under the influence of various Lewis acids. Among these, methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR) can be selectively rearranged from trisubstituted epoxides to aldehydes, while antimony pentafluoride is employable for selective rearrangement to ketones under mild conditions.
Atom transfer carbonylation using ionic liquids as reaction media
作者:Takahide Fukuyama、Takaya Inouye、Ilhyong Ryu
DOI:10.1016/j.jorganchem.2006.08.072
日期:2007.1
Photo-induced ATC reactions of RI, CO, and amines to produce amides, were examined using ionic liquids, such as [bmim]PF6 and [bmim]NTf2, as reaction media in the presence of a catalytic amount of a Pd-carbene complex. When the primary alkyl iodide was used, the yield of the amide was lowered due to competing S(N)2 reactions between RI and amines, whereas the reaction of the tertiary alkyl iodides was dependent on the structure of the substrates. ATC reactions of a wide variety of secondary RI proceeded smoothly when ionic liquids were used as reaction media. The Pd-catalyst and ionic liquid could also be recycled. (c) 2006 Elsevier B.V. All rights reserved.
Church; Whitmore; McGrew, Journal of the American Chemical Society, 1934, vol. 56, p. 180,183
作者:Church、Whitmore、McGrew
DOI:——
日期:——
Metallophthalocyanine complex, Cr(TBPC)OTf: an efficient, recyclable Lewis acid catalyst in the regio- and stereoselective rearrangement of epoxides to aldehydes
The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewisacidcatalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.