Patent ID: 7919635

Claim:
A process for preparing a compound according to formula (Ia): comprising reacting a compound of formula (Ia-A) with chlorine (Cl 2 ) and an alkali metal fluoride; in which: R 1a and R 1b are independently a hydrogen atom; a primary or secondary alkyl group having from one to eight carbon atoms; or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage; R 2a′ and R 2b′ are independently a hydrogen atom or a halogen atom; and R 3 is a hydrogen atom; a primary, secondary, or tertiary alkyl group having from one to eight carbon atoms; or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage; wherein when R 3 is a hydrogen atom, R 1a and R 1b are independently a primary or secondary alkyl group having from one to eight carbon atoms or at least one of R 1a and R 1b is a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage, and wherein, when R 3 is a primary alkyl group having one to eight carbon atoms, at least one of R 1a and R 1b is a primary or secondary alkyl group having from one to eight carbon atoms or a primary, secondary, or tertiary alkyl group having two to eight carbon atoms and at least one ether linkage.