bridge adducts; these, on relatively mild thermolysis, yield dihydrosemibullvalene derivatives by a novel sequence including cheletropic loss of carbon monoxide, electrocyclic ring opening of the immmediate substituted bicyclo[4,2,0] octadienes, and intramolecular [π4a +π2a]cycloaddition of the derived cyclooctatrienes. Other pericyclic reactions of compounds related to those of the title compounds
Synthesis and rearrangement of alkylaryl- and aryl-substituted dihydrosemibullvalenes by thermolysis of 7,8-fused cyclo-octa-1,3,5-triene derivatives
作者:Simon Greenfield、Kenneth Mackenzie
DOI:10.1039/p29860001651
日期:——
provide useful models for investigation of equilibria between the electrocyclic valence tautomers, the scope and mechanism for thermal cross-cyclisations in, for example, unsymmetrically substituted cyclo-octatrienes, and the thermal vinyl–cyclopropane (1,3-allylic shift) isomerisation and/or H-atom transfer disproportionation of the resulting arylated and alkylaryldihydrosemibullvalenes. The results best
已经系统地研究了环丁二烯亲二烯(1)与环戊二烯酮的热环加成;立体异构体加合物可通过脱羰作用方便地获得各种四芳基-,甲基三苯基-,三苯基-,三叔丁基-和二甲基二苯基-环辛-1,3,5-三烯衍生物异戊二烯桥键合的价互变异构初级产物的开环,即。双环[4.2.0]辛二烯。这些化合物为研究电价互变异构体之间的平衡,热交联的范围和机理(例如不对称取代的环辛烯和热乙烯基-环丙烷(1,3-烯丙基转移)的异构化)提供了有用的模型。和/或所得芳基化的和烷基芳基二氢半bullvalenes的H原子转移歧化。该结果与环辛三烯-二氢半双戊烯转化和随后的重排的双自由基途径最相符。还报道了有用的13 C和1 H nmr结构相关性以及环戊二烯酮的新实例。
The thermal rearrangement of tetra-arylated dihydrosemibullvalene derivatives, and 1H/13C NMR-structure correlations
作者:S. Greenfield、K. Mackenzie
DOI:10.1016/s0040-4039(01)80226-4
日期:1984.1
A systematic study of the thermal cyclisation of isomeric di-p-anisyl-diphenylcyclooctatriene derivatives, and of the facile isomerisation of the resulting dihydrosemibullvalenes, with 1H/13C nmr-structure correlations, supports earlier proposals for rearrangement mechanism.
异构二-对-茴香基-二苯基环辛三烯衍生物的热环化以及所形成的具有1 H / 13 C nmr-结构相关性的二氢半bullvalene的容易异构化的系统研究,支持了较早提出的重排机理的建议。