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4 - chloro - 4 - alkoxy 1,1,1-trich - trifluoro - 2 - butanoner, their manufacture and their use in the preparation of 4 - alkoxy 1,1,1-trich - trifluoro - 3 - butene - 2;
4 - chloro - 4 - alkoxy 1,1,1-trich - trifluoro - 2 - butanoner, their manufacture and their use in the preparation of 4 - alkoxy 1,1,1-trich - trifluoro - 3 - butene - 2;