Peresters . •<?<? peroxyesters

Polymers ndResins. / fZ-Butyl peroxyneopentanoate and other peroxyesters of neopentanoic acid can be used as free-radical initiators for the polymeri2ation of vinyl chloride [75-01-4] (38) or of ethylene [74-85-1]. These peresters have also been used in the preparation of ethylene—vinyl acetate copolymers [24937-78-8] (39), modified polyester granules (40), graft polymers of arninoalkyl acrylates with vinyl chloride resins (41), and copolymers of A/-vinyl-pyrrohdinone [88-12-0] and vinyl acetate [108-05-4] (42). They can also be used as curing agents for unsaturated polyesters (43). 

Copper salts are usually the superior reagents for this reaction. Reaction (88) is analogous to the peroxyester reaction,673 b 97 100 101 110,111 in which a variety of organic substrates are selectively oxidized by tert-butyl peresters in the presence of catalytic amounts of transition metal salts, particularly copper complexes ... 

The decomposition of a peroxyester by a stannous salt involves 2 mol of perester since the oxidation of stannous ion to stannic is a two-electron transfer, that is. 

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