139483-63-9Relevant articles and documents
Process for the preparation of 2,2-dimethyl-5-(2,5-dimethyl-phenoxy)-pentanoic acid, intermediates for preparing this compound and process for preparing the intermediates
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, (2008/06/13)
The invention relates to an improved process for the preparation of 2,2-dimethyl-5-(2,5-dimethylphenoxy)-pentanoic acid of Formula (I) STR1 which comprises reacting an ester of the general Formula (X) STR2 wherein X represents halogen and Z stands for a straight or branched chain C1-8 alkylene group optionally substituted by one or two 2,2-dimethyl-5-halopentanoyloxy group(s), wherein halo represents chlorine or bromine, and in which alkylene group one or two methylene group(s) may be optionally replaced either by hetero atom(s) or by a bivalent heterocyclic group--with an alkali salt of 2,5-dimethylphenol of Formula (II) STR3 or with an ester of the latter formed with a lower alkanoic acid, and hydrolizing the aryloxy-substituted ester of the general Formula (XI) thus obtained. Furthermore the invention relates to intermediate compounds of the general Formula (X), wherein X and Z are as stated above, and to a process for the preparation thereof.
