A 5-carbaphosphatrane and a 6-carbaphosphatrane were synthesized by utilizing triarylmethyl-type tetradentate ligands. Their structures were determined by X-ray crystallographic analysis to reveal that they have nealy ideal trigonal bipyramidal structures with a perfectly anti-apicophilic arrangement. (1)J(PH) and (1)J(PC) values of carbaphosphatranes were shown to be extraordinarily large as an apical coupling constant. The reactivities of carbaphosphatranes based on the tautomerization with their corresponding phosphonites were demonstrated in some reactions.
5-Carbaphosphatranes: The First Main Group Atrane Bearing a 1−5 Covalent Bond
作者:Junji Kobayashi、Kei Goto、Takayuki Kawashima
DOI:10.1021/ja0056264
日期:2001.4.1
Reactions of 1-Hydro-5-carbaphosphatrane: Tautomerization between Five-Coordinate and Three-Coordinate Species
作者:Junji Kobayashi、Kei Goto、Takayuki Kawashima
DOI:10.1080/10426500212207
日期:2002.6.1
Oxidation, sulfurization, and selenation of a 1-hydro-5-carbaphosphatrane afforded the corresponding cyclic phosphonate, cyclic phosphonothioate, and cyclic phosphonoselenoate, respectively. These results indicate the existence of the tautomerization between the five-coordinate 5-carbaphosphatrane and the three-coordinate cyclic phosphonite.