| 摘要 |
1393617 Piperidine-spiro-hydantoins SANKYO CO Ltd 3 July 1972 [2 July 1971] 30942/72 Headings C2C and C2P [Also in Division C3] The invention comprises compounds of the formula in which X represents an oxygen or sulphur atom; n is an integer of from 1 to 4; and R represents, when n is 1, an alkenyl group (which may be halogen-substituted), an alkynyl group (which may be phenyl-substituted), an aralkyl group (which may be substituted with halogen, alkyl containing from 1 to 4 carbon atoms or halomethyl), a hydroxyalkyl group, an alkoxyalkyl group, an alkenyloxyalkyl group, an aryloxyalkyl group, an alkylthioalkyl group, an acyloxyalkyl group, an epoxyalkyl group, an N- alkyl-substituted aminoalkyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, an aliphatic acyl group, an alkoxycarbonyl group, a phenoxy or alkoxy substituted phosphino group or a phenoxy or alkoxy substituted phosphinyl group, when n is 2, an alkenylene group containing from 4 to 18 carbon atoms, a dialkyleneether group, an aralkylene group, a bis-(acyloxyalkylene) group or an alkylene-bis-(oxycarbonylalkyl) group, when n is 3, a tris-(acyloxyalkylene) group, an alkanetris-(oxycarbonylalkyl) group or a group of formula in which each p is 1-8, or, when n is 4, a tetrakis-(acyloxyalkylene) group. These compounds may be prepared by the process where X 1 is halogen. The starting material above in which X is S is prepared by reacting 4-amino-4-cyano-2,2,6,6- tetramethylpiperidine with CS 2 and S in an organic solvent. The compounds of the invention are polymer stabilizers. |
