Les (triméthylsilyl)bicyclo[n.1.0]-alcènes, nouveaux silylcyclopropanes bicycliques fonctionnels
作者:M. Grignon-Dubois、J. Dunoguès、M. Ahra
DOI:10.1002/recl.19881070322
日期:——
Nous proposons une méthode de synthèse de bicyclo[n.1.0]-alcènes siliciés originaux, de mise en œuvre simple et rapide. Elle permet d'accéder dans de bonnes conditions aus deux isomères endo et exo monosiliciés ainsi qu'aux analogues gem-disiliciés.
双环[n.1.0]-硅酮合成的原理和方法,从简单到快速。Elle permet d'accéderdans de bonnes条件是aus deuxisomèresendo et exomonosiliciésainsi qu'aux类似物gem- disiliciés。
Studies in the cycloproparene series: 2-halocyclopropabenzenes1
作者:Brian Halton、Clifford J. Randall
DOI:10.1016/s0040-4039(00)85903-1
日期:1982.1
Labelling studies show that dehydrohalogenation of the tetrahalobicycloheptane (8b,c) yields the title compounds (5a,b) both with and without skeletal rearrangement. 2-Chlorocyclopropabenzene (5b) is the major product and the expected 2-bromo derivative (5a) the minor product of reaction from the ‘mixed’ tetrahalide (8c).
The reactive bicyclo[n.1.0]alk-1(omega)-enes (n = 3-6) 9a-d are formed by dehydrochlorination of 8a-d and trapped by diphenylisobenzofuran as exo Diels-Alder adducts 10a-d. With 8c the major adduct, 18 results not from interception of 9c but from diene 16 that is formed by dehydrochlorination/rearrangement sequences. Attempted interception of cyclopropenes 9a-d by furan provides a [4 + 2] product 19 from 9b (n = 4) only. Under the conditions employed, 9a (n = 3) ring expands to carbene prior to furan trapping while homologues 9c and 9d (n > 4) rearrange and lose HCl to give 17 and 20, respectively, without intervention of furan. 7-Chlorobicyclo[4.1.0]hepta-1(7),3-diene is likewise captured by diphenylisobenzofuran as 13.
Banwell, Martin G.; Halton, Brian, Australian Journal of Chemistry, 1980, vol. 33, # 10, p. 2277 - 2290
作者:Banwell, Martin G.、Halton, Brian
DOI:——
日期:——
Hashem, Md. Abul, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 424 - 429