Benzyne, cyclohexyne, and 3-azacyclohexyne and the problem of cycloalkyne versus cycloalkylideneketene genesis
作者:Curt. Wentrup、Rodney. Blanch、Horst. Briehl、Gerhard. Gross
DOI:10.1021/ja00214a034
日期:1988.3
Benzyne, cyclohexyne, and 3-azacyclohexyne have been obtained by flash vacuum pyrolysis of phthalic anhydride, 4-cyclopentylidene-3-methylisoxazol-5(4H)-one (34), and 3-methyl-4-(2-pyrrolidinylidene)isoxazol-5(4H)-one (37), respectively, isolated at 77 K and observed by IR spectroscopy. Trapping and fragmentation reactions are described, and the implications for the mechanism of benzyne formation from
苯、环己炔和 3-氮杂环己炔已通过邻苯二甲酸酐、4-环戊基-3-甲基异恶唑-5(4H)-酮 (34) 和 3-甲基-4-(2-吡咯烷亚基)异恶唑的快速真空热解获得-5(4H)-one (37) 分别在 77 K 下分离并通过红外光谱观察。描述了捕集和断裂反应,并讨论了邻苯二甲酸酐通过环戊二烯亚基乙烯酮 (9) 形成苄的机理。