Structural Parameters and Electronic Interactions in Substituted 1,1-Diethynylcyclopropanes − An Experimental Study
作者:Armin de Meijere、Sergei I. Kozhushkov、Roland Boese、Thomas Haumann、Dmitrii S. Yufit、Judith A. K. Howard、Leonid S. Khaikin、Marit Trætteberg
DOI:10.1002/1099-0690(20022)2002:3<485::aid-ejoc485>3.0.co;2-7
日期:2002.2
either compounds 4 and 5, as the bond lengths in the C≡C−C−C≡C fragments were exactly the same in both molecules and very close to those in unsubstituted 1,1-diethynylcyclopropane (3). A gas-phase electron-diffraction structure analysis of 4 revealed triple bonds significantly longer [1.240(1) Å] than those found by crystal structure analysis [1.205(2) Å]. The observed shortening of the triple bonds
通过使已知的1-(溴乙炔基)-1甲硅烷基化制备1,1-双(三甲基甲硅烷基乙炔基)环丙烷(4)和3,3'-(1,1-环丙二基)双(2-丙酸酯)二甲基(5)。 - (三甲基硅乙炔)环丙烷(7),通过1,1- diethynylcyclopropane(双羧3在91分别再进行酯化反应),和74%的总产率,。由乙二螺[2.0.2.1]庚烷-7-羧酸酯(9)以十步法合成了7,7-二乙炔基二螺[2.0.2.1]庚烷(6),总收率为41%。在紫外线照射下,二乙炔4进行乙烯挤出,然后将得到的双(三甲基甲硅烷基乙炔基)卡宾经电子重组二聚,得到1,4,8-三(三甲基甲硅烷基)-3-(三甲基甲硅烷基乙炔基)oct-3-ene-1,5,7-三炔(20) (24%产率)。X射线晶体结构分析的4,5,和6揭示了乙炔片段和环丙烷环,但任一化合物的相同环丙烷环上的两个乙炔片段之间没有homoconjugative效果之间