Patent ID: 6864397

Claim:
A process for producing a difluoromethyl ether derivative represented by Formula (1d′): wherein R 1 and R 2 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 20 carbon atoms, in which at least one —CH 2 — may be substituted with —O—, —S—, —CH═CH— or —C≡C— but —O— is not adjacent to another —O—, and in which any hydrogen may be substituted with fluorine; rings A 1 , A 2 , A 3 , A 4 and A 5 each independently represent a 1,4-cyclohexylene group in which at least one —CH 2 — may be substituted with —O— or —S—, or a 1,4-phenylene group in which at least one ═CH— may be substituted with ═N— and at least one hydrogen on the ring may be substituted with fluorine, a cyano group or an alkyl group having 1 to 10 carbon atoms; Z 1 , Z 2 , Z 3 and Z 4 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms, in which at least one —CH 2 — may be substituted with —O—, —S—, —CH═CH— or —C≡C— but —O— is not adjacent to another —O—, and in which any hydrogen may be substituted with fluorine; Y 1 , Y 2 , Y 3 and Y 4 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 10 carbon atoms; k, l, m and n each independently represent 0 or 1; and o represents an integer of 1-10; which comprises using an 1,1-difluorovinyl derivative represented by Formula (1a′): wherein R 1 , rings A 1 , A 2 and A 5 , Z 1 , Z 2 , k, l and o have the same meanings as defined above; as a starting material.