The room-temperature reaction of equimolar quantities of phosphaalkyne RC≡P (2a; R = tBu; 2b, R = adamantyl) with the decaborane(12)-Lewis base adduct B10H12·2CH3CN (3) resulted in the formation of new phosphaborane compounds (phosphine-methylene ylides), nido-RC(H)PB10H13 (4a, R = tBu; 4b, R = adamantyl), in good yield (approximately 50% each). These slightly air-sensitive compounds were fully characterized by 1H, 11B, 13C, and 31P NMR, 2D 11B-11B COSY NMR, FT-IR, and mass spectroscopic analyses. The structures of 4a and 4b are proposed to consist of a nido-PB10 framework formally based upon a 26-skeletal-electron nido-[B11H11]- parent compound. Only the phosphorus atom was observed to be incorporated into the polyhedral framework with an exopolyhedral C(H)R group doubly bound to the cage phosphorus atom. Two related mechanisms are proposed to account for the observed products from these reactions.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry