0 to-10'is slow, apparently requiring several days to reach equilibrium, and the equilibrium is not very favorable. Some formation of polymeric by-products occurs, and there is considerable loss each time the product is distilled. Higher temperatures increase the amount of by-product formation. By equilibrating a sample of 1 with about 20 mol of boron trichloride, distilling the product mixture, and repeating this procedure a total of 12 times, a ...