自由基从双环[2.2.0]己烷中的桥位和桥头位都提取氢(4)。通过epr光谱法观察到双环[2.2.0]己烷-1-基。双环[2.2.0]己-2-基通过立体电子禁止的β-断裂重排,得到环己-3-烯基。与其他环丁烷不同,化合物(4)与溴原子进行S H 2反应。自由基夺取氢仅从C的亚甲基基团5环双环[3.2.0]庚烷(15A)。通过epr光谱法观察到双环[3.2.0]庚-2-基,以及通过立体电子允许的β-断裂将其重排为2-(环戊-2-烯基)乙基。溴原子从(15a)提取氢,未检测到S H 2反应。使用半经验MINDO / 3和MNDO方法研究了自由基及其重排。
作者:Kenneth B. Wiberg、Michael G. Matturro、Paul J. Okarma、Mark E. Jason、William P. Dailey、George J. Burgmaier、William F. Bailey、Philip Warner
DOI:10.1016/s0040-4020(01)87609-2
日期:——
The preparation of bicyclo [2.2.0]hex- 1(4)-ene (1) via ring expansion of a cyclopropylcarbene or the dehalogenation of 1-bromo-4-chlorobicyclo[2.2.0]hexane is described. It is one of the most reactive of the alkenes which may be observed at room temperature. Its reactions, including dimerization and cycloaddition reactions, are described. The latter lead to convenient preparations of [m.2.2]propellanes
Radical rearrangements of bicyclo[2.2.0]hexane: homolytic substitution of a cyclobutane ring
作者:John C. Walton
DOI:10.1039/c39870001252
日期:——
Bromine atoms react with bicyclo[2.2.0]hexane in an SH2 reaction at the bridgehead carbon atoms; the bicyclo[2.2.0]hex-2-yl radical rearranges by β-scission of the inter-ring bond.
溴原子在桥头碳原子上以S H 2反应与双环[2.2.0]己烷反应;双环[2.2.0] hex-2-yl自由基通过环间键的β断裂而重排。
Homolytic rearrangements of bicyclo[2.2.0]hexane and bicyclo[3.2.0]heptane
作者:John C. Walton
DOI:10.1039/p29880001371
日期:——
methylene groups of the C5 ring in bicyclo[3.2.0]heptane (15a). The bicyclo[3.2.0]heptan-2-yl radicals were observed by e.p.r. spectroscopy, as was their rearrangement, by stereoelectronically allowed β-scission, to 2-(cyclopent-2-enyl)ethyl radicals. Bromine atoms abstract hydrogen from (15a) and no SH2 reaction was detected. The radicals and their rearrangements were studied by semi-empirical MINDO/3
自由基从双环[2.2.0]己烷中的桥位和桥头位都提取氢(4)。通过epr光谱法观察到双环[2.2.0]己烷-1-基。双环[2.2.0]己-2-基通过立体电子禁止的β-断裂重排,得到环己-3-烯基。与其他环丁烷不同,化合物(4)与溴原子进行S H 2反应。自由基夺取氢仅从C的亚甲基基团5环双环[3.2.0]庚烷(15A)。通过epr光谱法观察到双环[3.2.0]庚-2-基,以及通过立体电子允许的β-断裂将其重排为2-(环戊-2-烯基)乙基。溴原子从(15a)提取氢,未检测到S H 2反应。使用半经验MINDO / 3和MNDO方法研究了自由基及其重排。
Accuracy of Calculations of Heats of Reduction/Hydrogenation: Application to Some Small Ring Systems
作者:Kenneth B. Wiberg
DOI:10.1021/jo302118b
日期:2012.11.16
satisfactory than the others. Large basis sets are usually needed in order to reproduce experiments. Some C–C bond hydrogenolysis reactions also have been examined including those of bicycloalkanes and propellanes. In addition, the dimerization of the remarkably strained bicyclo[2.2.0]hex(1,4)ene was studied. The reaction forming a pentacyclic propellane was calculated to have ΔH = −57 kcal/mol, and the cleavage