Patent ID: 6605747
Filing Date: 2003-08-12
Classification: C09K

Abstract:
A process for producing a difluoromethyl ether derivative represented by Formula (1d): wherein R1 and R2 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 20 carbon atoms, in which at least one â€”CH2â€” may be substituted with â€”Oâ€”, â€”Sâ€”, â€”CH&boxH;CHâ€” or â€”Câ‰¡Câ€” but â€”Oâ€” is not adjacent to another â€”Oâ€”, and in which any hydrogen may be substituted with fluorine;rings A1, A2, A3 and A4 each independently represent a 1,4-cyclohexylene group in which at least one â€”CH2â€” may be substituted with â€”Oâ€” or â€”Sâ€”, or a 1,4-phenylene group in which at least one &boxH;CHâ€” may be substituted with &boxH;Nâ€” 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;Z1, Z2, Z3 and Z4 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms, in which at least one â€”CH2â€” may be substituted with â€”Oâ€”, â€”Sâ€”, â€”CH&boxH;CHâ€” or â€”Câ‰¡Câ€” but â€”Oâ€” is not adjacent to another â€”Oâ€”, and in which any hydrogen may be substituted with fluorine;Y1, Y2, Y3 and Y4 each independently represent hydrogen, halogen, a cyano group or an alkyl group having 1 to 10 carbon atoms; andk, l, m and n each independently represent 0 or 1; which comprises using an &agr;,&agr;-difluorocyclohexylidene derivative represented by Formula (1a): wherein R1, rings A1, and A2, Z1, Z2, k and l have the same meanings as defined above; as a starting material.