Abstract
The adducts of BI3 and BBr3 with various tertiary phosphines and their chalcogenide derivatives are described. The proton and boron-11 NMR spectra of many of these compounds are reported for the first time. Although the methyl proton-phosphorus-31 coupling constants are nearly identical in the (CH 3) 3PB X 3 ( X = F, Cl, Br, I) series, the boron-phosphorus coupling constant, J BP, is anomalously low for (CH 3) 3PBI 3 (116 Hz) relative to other members of the series. The phosphine adducts of BBr 3 and BI 3 are white, air and water insensitive solids, whereas the phosphine chalcogenide adducts are quite moisture sensitive. The BI 3 adducts with phosphine chalcogenides lose iodine fairly readily to form intractable material.
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