Photoinduced oxidation of propan-2-ol by acid chromate
The photoinduced oxidation of propan-2-ol by acid chromate has been studied (i) by flash photolysis, (ii) by quantum yield measurements at low light intensity, (iii) by e.s.r. measurements during photolysis of solutions containing a spin trap, and (iv) by e.s.r. measurements of glassy samples photolysed at –165°C. It was found that CrIV is formed in the primary processes, the most efficient of which involves the ester of acid chromate. The rate of formation of the ester was measured. A mechanism for the subsequent reactions of CrIV is given. In general the reactions of CrIV with another CrIV or with CrV are fast compared with the reaction of CrIV with propan-2-ol in the formation of 2-hydroxypropyl radicals. The reaction of CrIV with CrVI is immeasurably slow.