aluminium trichloride in dimethyl-ether byproducts: MeCl; condensation of B-compd. and Me2O on AlCl3 under N2, warming mixt. in a closed glass tube to 80°C for 30 to 45 min; fractionated condensation at -196°C (MeCl) and -78°C (product), elem. anal.;

in not given byproducts: MeOBCl2; reaction of B-compd. with BCl3 under N2;

aluminium trichloride byproducts: MeCl; warming B-compd. with AlCl3 in a closed tube to 80°C for 30-60 min under N2; monitoring by (11)B-NMR, fractionated condensation at 20°C, -78°C and -196°C, elem. anal.;