Carbene-stabilized diphosphorus: bidentate complexation of BH2+Electronic supplementary information (ESI) available: Full details of the syntheses, computations, and X-ray crystal determination, including cif files. CCDC 828167. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c1cc13224eSelected experimental, spectral, and X-ray data: [L:P(μ-BH2)P:L]+[B2H7]−2. 1.0 M BH3·THF in THF (3.60 mL, 3.60 mmol) was added into a Schlenk tube containing 1(0.600 g, 0.715 mmol) in 15 mL of THF at ambient temperature. After the mixture was stirred over night, the solvent was removed. The resulting solid was rinsed using 70 mL toluene and then filtered. The residue was vacuumed, giving the raw product of 2as off-white powder (0.51 g, 85.0% yield). X-ray quality single crystals of 2were obtained by recrystallization of 2in THF. Mp: melt and decomposed at 174 °C. 1H NMR (THF-d8): δ1.00 [d, 12H, CH(CH3)2], 1.01 [d, 12H, CH(CH3)2], 1.06 [d, 12H, CH(CH3)2], 1.27 [d, 12H,

Reaction of carbene-stabilized diphosphorus, L:P–P:L (L: = :C{N(2,6-Pri2C6H3)CH}2, 1), with excess BH3·THF affords the boronium salt [L:P(μ-BH2)P:L]+[B2H7]−, 2, which contains a three-membered P2B ring. When 2is dissolved in THF, compounds 1and 2exist in a dynamic solution equilibrium. [ABSTRACT FROM AUTHOR]