boron trichloride in n-heptane; 1,2-dichloro-ethane T=100°C; 120 h;

in hexane; pentane byproducts: (CH3)3SnCl, (CH3)2SnCl2; inert atmosphere, addn. of hexane soln. of BCl3 (large excess) to pentane soln. of stannyl compound at -40°C with stirring; separation of precipitate (-40°C), removement of volatiles, distillation (vacuum);

in dichloromethane dropwise addn. of the Sn compd. in CH2Cl2 to BCl3 in CH2Cl2 (under N2 or Ar) at -78°C, react. for 2 h at this temp., warming to room temp.; evapn. and fractional distn. (vac.);

in dichloromethane heating in a glass ampoule for 12 h ( under N2 or Ar) at 95°C; evapn. and distn. (vac.);

in dichloromethane byproducts: (CH3)3SnCl, (CH3)2SnCl2; inert atmosphere;

in 1,1,2,3,4,4-hexachloro-1,3-butadiene byproducts: BCl3; thermolysis in hexachlorobutadiene (16 h, 125°C);

in n-heptane byproducts: (CH3)BCl2, BCl3; inert atmosphere, reflux; sublimation;