| abstract |
Amide or 3-alkylation of 2,2,5,5-tetra-substituted imidazolidin-4-ones, using either monofunctional or polyfunctional cyclic ethers as alkylating agents, under basic conditions, or an ethylene carbonate. The cyclic ether reactants may be aldehydes or ketones having a single carbon atom in the ring. The alcohols obtained from ether addition to the 2,2,5,5-tetrasubstituted imidazolidin-4-ones may be converted to esterified derivatives by treatment with carboxylic acids or esters. Representative esters from mono- or polyalkylated imidazolidinones possess superior light stabilizing activity. Also embraces new compounds that are useful as light stabilizers for synthetic polymers. |