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process for the preparation of 1,2 - difluoro - 1,1,2,2tetracloroetano substantially devoid of isomer 1,1 - difluoro 1,2,2,2 tetracloro ethane
process for the preparation of 1,2 - difluoro - 1,1,2,2tetracloroetano substantially devoid of isomer 1,1 - difluoro 1,2,2,2 tetracloro ethane