| 摘要 |
<p>PCT No. PCT/GB97/02015 Sec. 371 Date Feb. 16, 1999 Sec. 102(e) Date Feb. 16, 1999 PCT Filed Jul. 25, 1997 PCT Pub. No. WO98/07707 PCT Pub. Date Feb. 26, 1998A process for preparing agrochemical intermediates of formula (I), wherein W is (CH3O)2CH.CHCO2CH3 or CH3O.CH=CCO2CH3; Z1 is a halogen atom; and R1, R2, R3 and R4 are independently hydrogen, halogen, C1-4 alky, C alkoxy, acetoxy or acyl; the process comprising the steps of: (a) reacting a compound of formula (II), wherein X, R1, R2, R3 and R4 are as defined above, with a compound of formula ROCH3, wherein R is a metal; and, (b) reacting the product of (a) with a compound of formula (III), wherein Z1 and Z2 are halogen atoms. A process for the preparation of compounds of formula (II) and compounds of formula (II) themselves. A process for obtaining, in substantially pure form, a compound of formula (11) and compounds of formula (II) themselves. A process for obtaining, in substantially pure form, a compound of formula (11) wherein R1, R2, R3 and R4 are all hydrogen.</p> |
