T=135°C; 18 h; Inert atmosphere;

boron trichloride in n-heptane; 1,2-dichloro-ethane T=140°C; 72 h; Inert atmosphereSealed tube;

in toluene byproducts: HgCl2; addn. of 3 equiv BCl3 to soln. of diphenyle nedimercury at -78°C, heating under reflux for some h; cooling, HgCl2 filtered off, toluene removed, subl. in vac. at 140°C;

1: anhydrous iron chloride; N,N,N',N,-tetramethylethylenediamine; diisobutylaluminium hydride; magnesium / tetrahydrofuran / -10 °C / Inert atmosphere 2: boron trichloride / n-heptane; 1,2-dichloro-ethane / 72 h / 140 °C / Inert atmosphere; Sealed tube View Scheme

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; inert atmosphere, reflux; sublimation;

in hexane; pentane inert atmosphere, addn. of hexane soln. of BCl3 to pentane soln. of stannyl compound at -40°C with stirring; separation of precipitate (-40°C), removement of solvent (vacuum), not separated, spectroscopic yield: chlorodimethylstannylbenzene/dichloroborylbenzene/diboraanthracene 65 mol-65/percent45percent mol-percent/10percent mol-percent;

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

boron trichloride

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