Other practical initiator systems based on hydrogen abstraction

1 Other practical initiator systems based on hydrogen abstraction 

Addition of small amounts of tertiary amines to benzophenone-type initiators was reported by Sander et al. to produce dramatic enhancement of initiating efficiency. This effect was determined to be caused not only by the good hydrogen bonding properties of the alkyl groups in the alpha position to nitrogen, but also by 

Ledwith, G. Ndaalio, and A.R. Taylor, Polmerization of methyl methacrylate photoinitiated by anthraquinone and 2 ten butylanthraquinone, Macromolecules 8, 1 (1975). 

Sander, C.L. Osborne, and D.J. Trecker, Benzophenone/triethylamine photoinitiated poly merization of methyl acrylate, J. Polym. Sci, Part A 1 10, 3173 (1972). 

Michler s ketone, also called 4,4 -bis(dimethylamino)benzophenone (XXXVI), is an aromatic ketone as well as a tertiary amine, and is by itself a complete initiating system. It undergoes H abstraction on irradiation and is a useful photoinitia- 

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