Dibenzoyl peroxide photochemical

Other compounds prepared by halolactamization of alkenes (and preceding the above woik ) include (64),(65), (66),2 (67), (bS), (69) and (70). Note that related sulfeno-, seleno- and tellu-ro-cyclizations have been discussed earlier (Section 3.5.5). Finally, related products may be obtained by radical reactions of N-haloamides, giving the following (71-73) representative products in reactions promoted thermally (71),photochemically (72 and 73),279.2so dibenzoyl peroxide (73) ° or chro-mous chloride (73). ... 

Bromination of 2-methylquinoxaline using l,3-dibromo-5,5-dimethylhydantoin in the presence of dibenzoyl peroxide (DBPO) under photochemical reaction conditions gives 2-bro-momethylquinoxaline which is a useful synthon for the synthesis of L-quinoxal-2-yiaianine. - ... 

Radical-catalyzed chlorination and bromination occur readily on alkanes and substituted alkanes, both in the gas phase and in solution. Both thermal and photochemical generation of the halogen atoms are employed for chlorinations, sulfuryl chloride in the presence of an initiator such as dibenzoyl peroxide is also used (Scheme 4.17). 

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