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The combination of the borane B(p-C(6)F(4)H)(3) and (o-C(6)H(4)Me)(3)P activates H(2) to give (o-C(6)H(4)Me)(3)PHHB(p-C(6)F(4)H)(3). This salt when placed under vacuum releases H(2) at room temperature.
Ullrich et al. (Fri,) studied this question.