Polymerization Reactions with Organotin Compounds

Co irradiation, butyl lithium or potassium-naphthalene, dialkylaltaninum hydride triphenyl phosphite. 

Brucella, Sarcina, Staphylococcus aureus (1327) (1) Styrene-maleic anhydride.  

thermogravlmetrlc anal. Prop., copolymer vlth (a)- BuLl 

MesSnOR + (1) R - H, Ac, CH2CI IIIB Prop., activity as microbiocide 1328 

and degradation Struct, and IR spectrum White powder, m. 5OO (00) 

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Table 267. Polymerization Reactions with Organotin Compounds... 

The applications of the strong affinity to oxygen of organotin compounds are as catalysts. Organotin compounds are used for the polymerization of polyurethanes, polymerization of silicones and esterifications as the catalysts [62,63,65]. The catalysts for reactions of phenylisocyanate with butanol as a basic reaction of polyurethane formation reaction are shown in Table 10.5 [78]. The reaction rate with dialkyItin compounds are 30000-80000 times faster compared with the reaction without a catalyst. The urethane is considered to be formed via the following four center mechanism [79]. 

Use of dihydrides introduces the possibility of formation of cyclic or polymeric organotin compounds by appropriate choice of bifunctional reaction partners. The first example of cyclic compound formation was reported by Henry and Noltes 58), who carried out the reaction shown in Eq. 20, with M being silicon or germanium. The same reaction involving diphenyldivinyltin yielded... 

Table 26 gives a short stnmnary of polymerization reactions reported with unsaturated and functionally substituted organotin compounds. The following scheme serves as a key to Polymerization Systems. 

Polymerization in such systems is based on the reaction of isocyanate with hydroxyl groups to form the urethane linkage-OrganometaI Iic compounds (especially organotin) are often used to catalyze this reaction in commercial applications such as Reaction Injection Molding. Formation of elastomers with good mechanical properties is dependent on both reaction kinetics and development of two phase morphology. 

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