Propynal Equivalents and Diazopropyne: Synthesis of All Mono-<sup>13</sup>C Isotopomers
作者:Randal A. Seburg、Jonathan A. Hodges、Robert J. McMahon
DOI:10.1002/hlca.200800446
日期:2009.8
Mechanistic and spectroscopic investigations of reactive C3H2 hydrocarbons necessitated the preparation of diazopropyne isotopomers bearing mono‐13C substitution at each of the three unique positions. The diazo compounds and their tosylhydrazone precursors were prepared from the mono‐13C isotopomers of propynal (in the form of either the aldehyde or the diethyl acetal). The introduction of 13C‐labeling
对反应性C 3 H 2烃的力学和光谱研究使得必须制备在三个独特位置均带有单13 C取代基的重氮丙炔异位异构体。重氮化合物及其甲苯磺酰zone前体是由丙炔的单13 C异构体(以醛或二乙缩醛的形式)制得的。在丙炔的任一炔烃位置引入13 C标记,利用Corey - Fuchs程序进行链同源。
Reaction of halogens with some α,β-unsaturated aldehydes and ketones
作者:Victor L. Heasley、Dale F. Shellhamer、Tom L. Carter、Daphne E. Gipe、Robert K. Gipe、Richard C. Green、John Hordeen、Terry D. Rempel、Dan H. Spaite、Gene E. Heasley
DOI:10.1016/s0040-4039(01)92934-x
日期:1981.1
Mechanisms are proposed to account for evidence indicating that some simple α,β-unsaturated aldehydes and ketones do not react with halogens by the expected attack on the CC bond.
提出了机制以解释表明某些简单的α,β-不饱和醛和酮不会因预期的对CC键的攻击而与卤素反应的证据。
An Economical and Convenient Synthesis of Vinyl Sulfones
A general process for the efficient synthesis of vinylsulfones has been developed using commercially available sulfinic acid sodium salts and dibromides. A variety of phenyl and methyl vinylsulfones have been formed in good yields, in the absence of any catalyst.
The direct regioselectivesynthesis of 3,5-disubstituted isoxazoles was achieved in one reaction vessel through a sequence of reactions involving the net bromination of an electron-deficient alkene, in situ generation of a nitrile oxide, 1,3-dipolar cycloaddition, and loss of HBr from an intermediate 5,5-disubstituted bromoisoxazoline. This one-pot process enables the synthesis of 3,5-disubstituted