Process for the preparation of optically active alpha-arylalkanoic acids and novel intermediates thereof

Abstract From the Canadian patent

The invention provides optically active esters of alpha arylalkanoic acids of formula, (C), in which Ar represents a monocyclic polycyclic, or orthocon-, densed polycyclic aromatic or heteroaromatic group having up to 12 carbon atoms in the aromatic system which group may be substituted by one or more halogen atoms C1-C4 alkyls, C3-C6, cycloalkyls, benzyl hydroxyl, alkali metal oxygen, C1-C4 alkoxy C1-C4 alkylthio, C1-C4 haloalkyl, C1-C4 haloalkoxy phenoxy, thienylcarbonyl and benzoyl; R represents a linear or branched C1-C4 alkyl radical; R1 and R2, which can be equal or different represent a hydorxy, O-M+, OR3 or NR4R5 wherein R3 is C1-C24, alkyl, C3-C6 cycloalkyl phenyl or benzyl; M+ is …