title: Planar subporphyrin borenium cations.
abstract: Subporphyrin borenium cations with a carborane counterion have been prepared by treatment of B-methoxy subporphyrins with the silylium reagent Et(3)Si(CH(6)B(11)Br(6)). In contrast to the distinctly domed subphthalocyanine borenium cation, a nearly planar structure with sp(2) hybridized boron is found in the X-ray structure of the triphenylsubporphyrin borenium cation. The cations exhibit absorption and fluorescence spectra that are quite similar to those of B-methoxy subporphyrins. B-phenyl subporphyrins were prepared in good yield by reaction of subporphyrin borenium cations with phenyllithium.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Tsurumaki
authors.forename: Shin-ya
authors.initials: SY
authors.lastname: Hayashi
authors.forename: Fook S
authors.initials: FS
authors.lastname: Tham
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Reed
authors.forename: Atsuhiro
authors.initials: A
authors.lastname: Osuka