In this paper, we present mass spectroscopic evidence for the dehydrogenati
on reaction from a dihydrogen bonded complex between phenol and borane-trim
ethylamine following resonance enhanced multiphoton ionization in the gas p
hase. The evidence presented herein is based on observed fragmentation patt
ern of the complex cation having high internal energy. To the best of our k
nowledge, it is the first report of such observation.