Flash vacuum pyrolysis of 2a, 7b-dihydrocyclobuta[b]-1-benzometalloles (6a-e), prepared from the corresponding 1-benzometalloles (3) containing Si, Ge, P, or As via three steps, resulted in valence isomerization with ring-opening to give 1, 1-dimethyl-1-benzosilepine (7a), 1-methyl-1-phenyl-1-benzosilepine (7b), 1, 1-dimethyl-1-benzogermepine (7c), 1-phenyl-1-benzophosphepine 1-oxide (7d), and 1-phenyl-1-benzarsepine 1-oxide (7e). The oxides (7d, e), on treatment with trichlorosilane, underwent deoxygenation to afford 1-phenyl-1-benzophosphepine (7f) and 1-phenyl-1-benzarsepine (7g). The 1-benzometallepines (7a-g) thus obtained are hitherto unknown heterocyclic ring compounds, and their thermal stabilities and several reactions were examined.
采用快速真空热解法处理由
硅、
锗、
磷或
砷的1-苯并
金属烯(3)经三步反应制备的2a, 7b-二氢环丁并[b]-1-苯并
金属烯(6a-e),导致价态异构化及环的开裂,得到1, 1-二甲基-1-苯并
硅宾烯(7a)、1-甲基-1-苯基-1-苯并
硅宾烯(7b)、1, 1-二甲基-1-苯并
锗宾烯(7c)、1-苯基-1-苯并膦宾烯1-氧化物(7d)和1-苯基-1-苯并
砷宾烯1-氧化物(7e)。这些氧化物(7d, e)在三
氯硅烷处理后,经历脱氧过程,产生1-苯基-1-苯并膦宾烯(7f)和1-苯基-1-苯并
砷宾烯(7g)。获得的1-苯并
金属烯(7a-g)是迄今为止未知的
杂环化合物,且研究了它们的热稳定性和若干反应。