Reaction of alkali-metal tetraphenylborates with amines in the presence of CO2: a new easy way to aliphatic and aromatic alkali-metal carbamates

A new method of synthesis of both aliphatic and aromatic alkali-metal carbamates and anhydrous alkylammonium tetraphenylborates by reaction, at room temperature, of amines with alkali-metal tetraphenylborates in the presence of CO2(0.1 MPa) has been determined. This reaction represents the first step of a new very selective synthetic route to alkali-metal carbamates from amines, carbon dioxide and alkali-metal hydroxides at room temperature and pressure. It is also the first example of the isolation of aromatic amine alkali-metal carbamates through a non-isocyanate route.