Chemical process
AssigneeImperial Chemical Industries PLC
InventorGlynn Mitchell
Life of this patent
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Abstract
Process for the preparation of herbicidally active substituted cyclohexan-1,3,5-triones which comprises either (a) reacting a compound of formula (II) ##STR1## wherein R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are, for example, hydrogen or C.sub.1 -C.sub.4 alkyl with a compound of formula (III): R.sup.1 COCN (III) wherein R.sup.1 is optionally substituted aryl in the presence of a base and a Lewis acid; or (b) reacting a compound of formula (VI) ##STR2## with a compound of formula (X) ##STR3## in the presence of a Lewis acid; or (c) where R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same, reacting a compound of formula (XI) ##STR4## with a compound of formula R.sup.3 X' in the presence of a base, wherein X' is a leaving group.
Claims6
A process for preparing a compound of formula (I) ##STR26## or a salt, acylate or sulphonate derivative thereof;
- wherein R' is an optionally substituted aryl group, in which the optional substitution is up to three groups selected from halogen;
- C.sub.1-4 alkyl;
- C.sub.1-4 alkoxy;
- halo (C.sub.1-4) alkoxy;
- cyano;
- nitro;
- C.sub.1-4 haloalkyl;
- R.sup.7 SO.sub.n where n is 0 1 or 2 and R.sup.7 is C.sub.1-4 alkyl or C.sub.1-4 alkyl substituted with halogen or cyano, phenyl or benzyl;
- NH.sup.8 R.sup.9 where R.sup.8 and R.sup.9 are independently hydrogen or C.sub.1-4 alkyl;
- R.sup.10 CO-- where R.sup.10 is C.sub.1-4 alkyl or C.sub.1-4 alkoxy;
- or SO.sub.2 NR.sup.8 R.sup.9 where R.sup.8 and R.sup.9 are as defined above, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are C.sub.1-4 alkyl, which process comprises reacting a compound of formula (XI) ##STR27## with a compound of formula R.sup.2 X' in the presence of a base, wherein X' is a leaving group;
- and thereafter if desired forming a salt, or sulphonate derivative.
Dependencies are inferred from the claim text.