Cationic Iron Aminocarbene Complexes as Dienophiles in Diels‐Alder Reaction with Cyclopentadiene
作者:Karola Rück‐Braun、Jörg Köuhn
DOI:10.1002/cber.19961290913
日期:1996.9
The cationic iron (alkynyl)aminocarbene complexes [Cp(CO)2Fe(C(NHR)CCSiMe3][PF6], (R C6H5, p-CH3C6H4) 1 derived from aromatic amines smoothly react with cyclopentadiene in dichloromethane to yield the cycloadducts 2. No reaction was observed for complexes derived from sterically demanding aliphatic amines, like L-alanine tert-butyl ester. For comparison, the alkynyl-substituted acyl iron compounds
源自芳族胺的阳离子铁(炔基)氨基卡宾络合物[Cp(CO)2 Fe(C(NHR)CCSiMe 3 ] [PF 6 ],(RC 6 H 5,p -CH 3 C 6 H 4)1平稳反应用环戊二烯在二氯甲烷中生成环加合物2,未观察到由空间上需要的脂族胺(如L-丙氨酸叔丁酯)衍生的配合物,作为比较,炔基取代的酰基铁化合物Cp(CO)2 Fe(CO )CC̊(R SiMe 3,C 6 H 5)3,需要TiCl 4催化进行环加成反应。通过X射线晶体学确定环加合物4的结构。