A direct synthetic route to B-trifluoroborazines

B-Tris(alkylamino)-N-trialkyl-borazines and B-tris(arylamino)-N-triaryl-borazines may be prepared almost quantitatively by employing the appropriate stoichiometry in the reaction between boron trichloride and an alkyl- or aryl-amine. The borazines so formed react with boron trifluoride or boron trifluoride etherate to give good yields of the B-trifluoro-N-trialkyl- and B-trifluoro-N-triaryl-borazines. Using this methods, (CH₃NBF)₃, (p-ClC₆H₄NBF)₃ and (C₆F₅NBF)₃ have been prepared. The analogous reaction using (C₆F₅)₃B as a route to B-tris(pentafluorophenyl)borazines was unsuccesful.