55488-36-3Relevant academic research and scientific papers
4-Alkyl-1,4-diaza-5-oxo-cycloheptanes and their 1-oxyls
-
, (2008/06/13)
2,2,7,7-Tetraalkyl- and 2,7-dispiroalkylene-5-oxo-1,4-diazacycloheptanes substituted in 4-position by mono- or tetravalent radicals are powerful light-stabilizers for organic polymers. They possess higher compatibility than their 4-unsubstituted homologues, from which they may synthesized by reactions known for N-alkylation. Preferred substituents in 4-position are alkyl, alkylene, alkenyl, aralkyl and esteralkyl groups. The 1-nitroxyls derived from the imidazolidines by oxydation with hydrogen peroxide or percarboxylic acids too are good light stabilizers.
