Flash photolysis of lignin: II—Oxidative photodegradation of dioxane-lignin

Abstract

The flash photolysis of a low molecular weight dioxane-lignin in the presence of oxygen showed the same transient spectrum as de-aerated solutions. Experiments performed in the presence of DABCO (1,4-diazabicyclo(2,2,2)octane) (a singlet oxygen scavenger) and ascorbic acid (a radical scavenger) showed that ground state oxygen is the main species participating in these processes. Singlet oxygen, sensitized by species other than carbonyls, may play a role in later stages of the reaction.