Allenes. Part XXI. The preparation of 1,1-dialkyl-3-iodoallenes and 1,1-dihalogenoallenes
作者:P. M. Greaves、M. Kalli、Phyllis D. Landor、S. R. Landor
DOI:10.1039/j39710000667
日期:——
1,1-Dialkyl-3-iodoallenes were prepared in good yield from 1,1-dialkylprop-2-yn-1-ols and 45% hydriodic acid in the presence of copper(I) iodide. Several 1-bromo- and 1-chloro-alk-1-yn-3-ols were converted by hydrogen bromide–copper(I) bromide or thionyl chloride into the corresponding 1,1-dibromo-, 1-bromo-1-chloro- or 1,1-dichloro-allenes. The mechanism of the reaction is discussed and the spectroscopic
Copper(I) complexes from 1-bromopropyn-3-ols, dimethylformamide and copper(I) cyanide and their conversion to hydroxyacetylenic nitriles and hexadiynediols
作者:Stephen R. Landor、Basil Demetriou、Roman Grzeskowiak、Douglas F. Pavey
DOI:10.1016/s0022-328x(00)94152-4
日期:1975.7
Copper(I) complexes of approximate composition (CuCN)4·(DMF)2·RR′C(OH)CCBr have been isolated from copper(I) cyanide and 1-bromopropyn-3-ols in dry dimethylformamide (DMF). Decomposition of thes complexes with aqueous DMF gives 4-hydroxybutynenitriles in about 60% yield. For preparative purposes it is not necessary to isolate the complex, similar yields being obtained in a one step process. Decomposition
Cs<sub>2</sub>CO<sub>3</sub>-Promoted reaction of tertiary bromopropargylic alcohols and phenols in DMF: a novel approach to α-phenoxyketones
作者:Ol'ga G Volostnykh、Olesya A Shemyakina、Anton V Stepanov、Igor' A Ushakov
DOI:10.3762/bjoc.18.44
日期:——
The reaction of bromopropargylic alcohols with phenols in the presence of Cs2CO3/DMF affords α-phenoxy-α’-hydroxyketones (1:1 adducts) and α,α-diphenoxyketones (1:2 adducts) in up to 92% and 24% yields, respectively. Both products are formed via ring opening of the same intermediates, 1,3-dioxolan-2-ones, generated in situ from bromopropargylic alcohols and Cs2CO3.
在 Cs 2 CO 3 /DMF存在下溴代炔丙醇与酚类的反应产生高达 92% 的 α-苯氧基-α'-羟基酮(1:1 加合物)和 α,α-二苯氧基酮(1:2 加合物)和收益率分别为 24%。两种产品都是通过相同的中间体 1,3-二氧戊环-2-酮的开环形成的,该中间体由溴炔丙醇和 Cs 2 CO 3原位生成。
Straus; Kollek; Heyn, Chemische Berichte, 1930, vol. 63, p. 1875
作者:Straus、Kollek、Heyn
DOI:——
日期:——
Nagibina, Zhurnal Obshchei Khimii, 1940, vol. 10, p. 431,432