Allenes. Part XI. The preparation of 3-alkyl- and 3,3-dialkyl-1-bromoallenes
作者:S. R. Landor、A. N. Patel、P. F. Whiter、P. M. Greaves
DOI:10.1039/j39660001223
日期:——
3-Alkyl- and 3,3-dialkyl-1-bromoallenes are prepared in excellent yield by the action of hydrobromic acid (45–50%) on secondary or tertiary acetylenic carbinols. They show an exceptionally intense band in the infrared region, a small maximum in the ultraviolet region above 210 mµ, and the expected n.m.r. long range spin–spin coupling.
通过氢溴酸(45%至50%)对仲或叔炔醇的作用,可以以极好的收率制备3-烷基和3,3-二烷基-1-溴代烯丙基。它们在红外区域显示出异常强烈的谱带,在210 m µ以上的紫外区域显示出很小的最大值,并且具有预期的nmr长程自旋-自旋耦合。
Novel insertion reactions of vinylidene-carbenes into carbon–hydrogen and silicon–hydrogen bonds
作者:J. Cymerman Craig、Charles D. Beard
DOI:10.1039/c29710000692
日期:——
n-Alkylvinylidene-carbenes generated from 1-bromo-1,2-dienes and KOBut insert into the Si–H bond of triethylsilane, into the C–H bond α to oxygen in 2,5-dimethyltetrahydrofuran, and into the C–H bond α to hydroxy in primary alcohols.
Reactions of 3-alkyl- and 3,3-dialkyl-1-bromoallenes with organocuprates: Effects of the nature of the cuprate reagent on the regio- and stereoselectivity
作者:Anna Maria Caporusso、Carmela Polizzi、Luciano Lardicci
DOI:10.1016/s0040-4039(00)96867-9
日期:1987.1
Organocuprates induce 1,3- and direct substitution in 3-alkyl- and 3,3-dialkyl-1-bromo-1,2-dienes leading respectively to either terminal acetylenes or allenic hydrocarbons. The nature of the cuprate exerts a prominent role in determining both the regio- and the stereochemistry of these reactions.
Allenes. Part XX. The preparation of 3-alkyl- and 3,3-dialkylallenenitriles
作者:P. M. Greaves、S. R. Landor、D. R. J. Laws
DOI:10.1039/j39680000291
日期:——
3-Alkyl- and 3,3-dialkylallenecarbonitriles are conveniently prepared in good yield from 1-alkyl and 1,1-dialkyl-3-bromoallenes by the action of cuprous cyanide in NN-dimethylformamide at 35–60° for 2 hours. Tertiary acetylenic alcohols may be directly converted into 3,3-dialkylallenecarbonitriles by stirring for 3 days with potassium cyanide, cuprous cyanide, and hydrobromic acid. The same mixture
Allenes. Part XXVII. Reaction of dialkyl(lithio)copper reagents with 1-bromoallenes, 1-iodoallenes, and 3-chloroalk-1-ynes
作者:Michael Kalli、Phyllis D. Landor、Stephen R. Landor
DOI:10.1039/p19730001347
日期:——
Allenichydrocarbons are obtained in high yield by the reaction of 1-halogenoallenes or 3-chloroalk-1-ynes with dialkyl(lithio)copper reagents at low temperature.