[摘要]：1-Alkenyl-3,4,5-triaryl-1,2-diphosphacyclopenta-2,4-dienes obtained by alkylation of sodium 3,4,5-triaryl-1,2-diphosphacyclopentadienide with Br(CH(2))(n)CH=CH(2) undergo, depending on the n value, either an intermolecular Diels-Alder reaction leading to polymeric compounds (n = 1, 4) or intra-molecular cycloaddition reactions to give tricyclic cage phosphanes with high regio- and stereoselectivity (n = 2, 3). The structures and conformational behavior of these new tricyclic phosphanes are discussed.
