| 摘要 |
<p>A compound of the formula I wherein R1 are same and stand for hydrogen or alkyl having from 1 to 6 carbon atoms, R2 is hydrogen, alkyl having 1 to 12 carbon atoms, alkenyl having 3 to 4 carbon atoms, propargyl, benzyl, alkyl substituted benzyl, aliphatic acyl having 1-4 carbon atoms, C2-C21 alkoxyalkyl or oxyl, R3 is straight-chain alkenylene of 2 to 4 carbon atoms, 1,2-cycloalkylene or 1,2-cycloalkenylene having 4 to 6 carbon atoms, 2,3-bicycloalkylene or 2,3-bicycloal-kenylene having 7 or 8 carbon atoms or 1,2-, 1,3-, or 1,4phenylene or straight-chain alkylene of 1 to 4 carbon atoms substituted by alkyl or alkenyl of 1 to 18 carbon atoms, provided that said straight-chain alkylene substituted by alkyl has in total more than 10 carbon atoms, M is hydrogen or a metal selected from the group consisting of barium, nickel, manganese, calcium, copper, zinc, magnesium, sodium, potassium, cobalt, tin, and dialkyl tin z has a valve of from 1 to 4, the value of z being the same as the available valence of M. The compounds I are useful as light stabilizers for synthetic polymers. - 1a</p> |
