Contributions to the Chemistry of Twofold-Coordinated Group 15/14 Element Heterocycles (A Personal Account)

摘要

Synthesis, properties, and reactivity towards metal compounds of benzo- and pyrido-anellated 1,3-azaphospholes and 1,3,2λ~2-diazaelement-2-ylidenes are described. They present heterocycles bearing a twofold-coordinated (σ~2) groupl5 element in 3- or a σ~2-group14 element in 2-position. Migration of substituents between the 2- and 3-position that would make them isomers was so far not obserυed. Nevertheless, they are relatiυes with respect to stabilization of the twofold-coordinated element by inclusion into a cyclodelocalized 10π-electron system and by weak donor but notable π-acceptor properties.