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ABSTRACT Detailed computational studies have been carried out to explain the unexpected differing reactions that occur between dimethylamine and the difluorophosphines, CX3PF2 (X = F, Cl). The reaction affords the thermodynamically controlled product chloroform in the case of X = Cl, whereas when X = F the analogous reaction pathway leading to fluoroform is hindered by a substantial reaction barrier in the gas phase, where the reaction should take place due to the volatility of the reactant. While the gas‐phase reaction energy gap is somewhat reduced when X = Cl, due to the stability of the migrating CCl3− moiety, the still substantial barrier does not account for the chloroform formation. Polarizable continuum model (PCM) calculations indicate a reduction of the barrier, facilitating the liquid‐phase reaction. The alternative gas‐phase reaction path, resulting in the aminolysis of a P—F bond is reversible and is shifted toward the product by capturing HF as the dimethylamino salt of the (CF3PF4H)− anion.
Heteroatom Chemistry – Wiley
Published: Jul 1, 2015
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