New 2,2 ', 6,6' - tetra alkyl - 2,2 ', 6,6' - tetramethyl- - 4,4 '- bipiperidyliden - derivatives

摘要

1489849 4,4SP1 /SP- Bipiperylidene derivatives SANKYO CO Ltd 12 July 1976 [8 Aug 1975] 33228/75 Heading C2C [Also in Division C3] Novel 4,4SP1/SP-bipiperylidene derivatives of the formula wherein: each of the symbols Z represents a hydrogen atom or an alkyl group; and X and Y are the same or different and each represents a hydrogen atom, an oxyl group, a hydroxy group, an alkyl group, an alkenyl group, an alkoxyalkyl group, a cyanoalkyl group, an aliphatic acyl group, a 2,3-epoxypropyl group, an unsubstituted aralkyl group, an aralkyl group which is substituted in its aryl moiety, a group of formula -CH 2 CH(RSP1/SP)ORSP2/SP (wherein RSP1/SP represents a hydrogen atom, a methyl group or a phenyl group; and RSP2/SP represents a hydrogen atom, or an aliphatic, aromatic, araliphatic or alicyclic acyl group), a group of the formula -CH 2 COORSP3/SP (where RSP3/SP represents an alkyl group, an alkenyl group, a phenyl group, an aralkyl group or a cyclohexyl group), or a group of the formula -COORSP4/SP (wherein RSP4/SP represents an alkyl group, a benzyl group, a phenyl group or a cyclohexyl group, and acid addition salts thereof, are prepared by several methods. The novel compounds are useful as stabilizers for polymeric compounds.