Trimethylamine-monochloroborane

The addition compound of trimethylamine and monochloro-borane was first synthesized by the reaction of gaseous hydrogen chloride with trimethylamine-borane at low temperature in a vacuum line. Although boron trichloride4 or mereury(II) chloride5 can be used, the first method can easily be modified for large-scale runs by using aqueous concentrated hydrochloric acid.5 No special precautions for the exclusion of air or water are necessary. 

Synthesis can be accomplished more rapidly, but in lower yield, with aqueous HC1. In an Erlenmeyer flask, 2.78 g. 

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