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The interactions of   t  -   C  4    H  9  +    ions from neopentane with some simple polar molecules have been investigated in a high pressure photoionization mass spectrometer at thermal kinetic energies. Proton transfer was found to occur from   t  -   C  4    H  9  +    to acetone, ammonia, and the various methylamines, but not to molecules having estimated proton affinities &lt; 195 kcal/mol (815 kJ/mol). Macroscopic thermal rate coefficients are reported for the various proton transfer reactions, all of which are on the order of 10 -9 cm 3 /molecule · second. The reaction    t    -C   4    H  9  +   +  2    CH   3   OH  →(CH   3   OH   )    2    H  +   +   C  4    H  8was found to occur, but not the analogous reaction with H 2 O. On the basis of supplementary experiments, new limits are reported for the proton affinity of acetone. These are 203±2 kcal/mol &lt; proton affinity of acetone &lt; 207 kcal/mol.

Kinetic mass spectrometric investigation of the reactions of t-C4H9+ ions with some simple polar molecules at thermal energies