title: Synthesis and structure of a 1-phospha-2-boraacenaphthene derivative and its chalcogenation reactions.
abstract: The first stable 1-phospha-2-boraacenaphthene 1 was synthesized by the reduction of 1-dimesitylboryl-8-dichlorophosphinonaphthalene (2a) with elemental magnesium, and it was fully characterized. The chalcogenation reaction of 1 with elemental sulfur or selenium afforded the unique heterocycles, 2-thia- and 2-selena-1-phospha-3-boraphenalenes 9S and 9Se, respectively, through the insertion of the chalcogen atom into a P-B bond of 1. Further chalcogenation of 9 afforded the corresponding phosphine chalcogenides. These newly obtained chalcogenated compounds have been characterized. The unique dynamic behavior of 2-chalcogena-1-phospha-3-boraphenalene-1-chalcogenides 10 in solution has also been described.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tsurusaki
authors.forename: Takahiro
authors.initials: T
authors.lastname: Sasamori
authors.forename: Norihiro
authors.initials: N
authors.lastname: Tokitoh