H atom scavengers

An example of such a third competing step is the reaction of the intermediate aryl radical with H-atom donors present in the reaction medium, possibly the solvent itself. Indeed, aryl radicals are good H-atom scavengers and reduction of aryl halides is often carried out in organic solvents such as acetonitrile (ACN), lV,Af-dimethylformamide (DMF), dimethyl sulphoxide (DMSO), and ethers, that are good H-atom donors... 

Ung (984) has used 02 as an H atom scavenger in the 1470 A photolysis of H20. The ratio of H2 with 02 present to the overall H2 yield without 02 is 23%. From this information Ung estimates that the primary yield of H2 production is 8%. 

H atom scavengers—i.e., alcohols, were added. However at neutral pH, hydrogen evolution according to... 

A mechanism involving reactions 22-26 requires the quantum yield of H2( h2) anc t ie quantum yield of CO(primary quantum yields, and were deduced, although addi-... 

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