[C:1]([O-:6])(=[O:5])[C:2]([CH3:4])=[CH2:3].[CH2:7]([Sn+:11]([CH2:16][CH2:17][CH2:18][CH3:19])[CH2:12][CH2:13][CH2:14][CH3:15])[CH2:8][CH2:9][CH3:10].[C:20]([O:25][CH3:26])(=[O:24])[C:21]([CH3:23])=[CH2:22].C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C1C=CC=CC=1>[C:1]([O-:6])(=[O:5])[C:2]([CH3:4])=[CH2:3].[CH2:16]([Sn+:11]([CH2:7][CH2:8][CH2:9][CH3:10])[CH2:12][CH2:13][CH2:14][CH3:15])[CH2:17][CH2:18][CH3:19].[C:20]([O:25][CH3:26])(=[O:24])[C:21]([CH3:23])=[CH2:22]The polymerization of P43 was similar to that of P30. The same monomers, tri-n-butyltin methacrylate (174.4 grams, 0.444 mole) and uninhibited methyl methacrylate (40.0 grams, 0.444 mole) were copolymerized in equimolar quantities. The initiator for this solution polymerization was benzoyl peroxide (1% weight). P43 was a colorless, transparent copolymer that could be cast as a film from the benzene solution.
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