The salt [P(C6H5)3CH3*][B2H7"] was isolated from the reaction of B2H6 with [P(C6HS)3CH3+][BH4"]. Variable-temperature pmr spectra (-80 to +110°) of [P(C6HS)3CH3+][B2H7~] demonstrate intramolecular exchange of bridge and terminal hydrogens at temperatures above 50°. Spin coupling of bridge and terminal hydrogens was observed near -35°. The compound is stable in a closed system to nearly 100°but rapidly loses diborane at 100°under dynamic vacuum.The B2 H," ion is apparently unaffected by tetrahydrofuran. With (CH3)2S the reaction CH2C12 (CH3)2S + b2h7-< (CH3)2SBH3 + bh4is observed. The equilibrium constant as a function of temperature was determined from boron-11 nmr spectra. With N(CH3)3 the corresponding reaction is apparently complete.
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