triethylamine in benzene byproducts: NEt4Cl; B-compd. dissolved in benzene, cooled in ice bath, i-butylamine dissolved in benzene added dropwise with stirring, mixt. allowed to attain roomtemp., triethylamine added to resulted complex, mixt. refluxed for 3 h; NEt4Cl filtered, solvent removed from the filtrate, residue vac. distd.; elem. anal.;