An ordinary photochlorination of 1, 1-dichloroethane gave 1, 1, 1-trichloroethane and 1, 1, 2-trichloroethane in a yield of 75% and 22%, respectively.In the present study, it was found that the selectivity for 1, 1, 1-trichloroethane was markedly improved when carbon disulfide was bresent. Such effects of carbon disulfide varied depending on its concentration and the reaction temperatures. When 1, 1-dichloroethane was photochlorinated in the presence of 8 mol/1 carbon disulfide, 1, 1, 1-trichloroethane was obtained with a selectivity of 85-90% over a temperature range from 18°C to 45°C. The rate of the reaction decreased in the presence of carbon disulfide.
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