Alpha-substituted-alkylarylketals particularly useful for preparing alpha-arylalkanoic acids
AssigneeZambon S.p.A.
InventorsGraziano Castaldi, Claudio Giordano
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Abstract
Alpha substituted alkylarylketals of formula: ##STR1## wherein Ar is an aromatic radical having from 3 to 20 C atoms, X is halogen, OR.sub.3 (wherein R.sub.3 is H, acyl or aroyl), OSO.sub.2 CH.sub.3 or OSO.sub.2 C.sub.6 H.sub.4 --CH.sub.3, R is H or alkyl having from 1 to 3 C atoms, Y is --CH.sub.2 --C(R.sub.1).dbd.C(R.sub.2)--CH.sub.2 --(wherein, in turn, R.sub.1 and R.sub.2 are H or methyl). The products of formula I are useful for preparing alpha-aryl-alkanoic acids.
Claims2
A compound of formula ##STR5## wherein Ar is a phenyl ring substituted by one or two substituents selected from halogen, 1-6 C alkyl, 1-4 C alkoxy, 2-4 C alkenyloxy or a naphthyl ring substituted by one or two substituents selected from halogen and 1-4 C alkoxy;
- X is OR.sub.3 in which R.sub.3 is H, acyl or aroyl, OSO.sub.2 --CH.sub.3 or OSO.sub.2 --C.sub.6 H.sub.4 --CH.sub.3 ;
- R is H or an alkyl having from 1to 3 C atoms;
- and Y is --CH.sub.2 --C(R.sub.1).dbd.C(R.sub.2)--CH.sub.2 -- in which R.sub.1 and R.sub.2 are H or CH.sub.3.
A compound of formula ##STR6## wherein Ar is a phenyl ring substituted by one or two substituents selected from halogen, 1-6 C alkyl, 1-4 C alkoxy, 2-4 C alkenyloxy, phenyl, phenoxy, dichlorophenoxy, dichloroanilino, benzoyl, or a naphthyl ring substituted by one or two substituents selected from halogen and 1-4 C alkoxy;
- X is OR.sub.3 in which R.sub.3 is H, acyl or aroyl, OSO.sub.2 --CH.sub.3 or OSO.sub.2 --C.sub.6 H.sub.4 --CH.sub.3 ;
- R is H or an alkyl having from 1 to 3 C atoms;
- and Y is --CH.sub.2 --C(R.sub.1).dbd.C(R.sub.2)--CH.sub.2 -- in which R.sub.1 and R.sub.2 are H or CH.sub.3.
Dependencies are inferred from the claim text.