Methyl aciylate

It would appear that a similar mechanism probably applies to the many aziiidinations of alkenes with lead tetraacetate and a wide variety of other A -aminoheterocycles. In any case, such reactions are now thought unlikely to occur via a nitrene in competition eiqieriments, A -aminqphthalimide/lead tetraacetate reacts with styrene in preference to methyl aciylate (1.5 1), whereas with the supposed genuine nitrene (27) (whose nature is also in doubt " ) prepared by pyrolysis (Scheme 32), the ratio is reversed (1 3). Other sources of supposed (27) by pyrolysis include (28) and (29). Very recently, strong... 

Fig. 8. The effect of SDDS concentration (% in aqueous phase) on the monodispersity coefficient oT latex particles obtained by polymerization of (1) styrene (2) methyl methyacrylate aud (3) methyl aciylate. Ammonium persulfate, 0.05/i in aqueous phase T, 80°C phase ratio, 1 10.

Early fundamental studies of gas transport in polymers were almost entirely confined to hydrocarbon materials above their glass transition temperatures. The essentially nonpolar structures of the elastomers led to a number of reasonably successful attempts to correlate gas transport parameters with various physical characteristics of the gases and the polymers. These have been summarized and discussed in a number of papers In addition to studies with hydrocarbon elastomers a few studies of other amorphous polymers above their glass transition temperatures have dealt with polyvinyl acetate silicones and fluorocarbon polymers Recent studies have also dealt with poly(methyl aciylate) poly-(vinyl methyl ether) and poly(vinyl methyl ketone) With these more... 

Pasto and colleagues studied the stereochemical features of the [2 -b 2] cycloadditions of chiral allenes. The formation of a diradical intermediate in the cycloadditions of enan-tiomerically enriched 1,3-dimethylallene (10) with aciylonitrile (Ila) and methyl aciylate (11b) (equation 4) was shown to be irreversible. 1,3-Dimethylallene recovered from the reaction mixture was shown to have the same ee as the starting material. Interestingly,... 

Furthermore, regioselectivities as weU as the diastereofacial selectivities - may be increased in the presence of Lewis acids (Table 8). For instance, AICI3 OEt2 improves the endb-selectivity of the reaction of cyclopentadiene and methyl aciylate from 82% to 98%. The astonishing rate accelerations, the improved yields and higher selectivities make the Lewis acid catalysed Diels-Alder reaction one of the most important organic reactions. 

Polyparaphenylenevinylene based macro-initiator 2 was used for NMRP of various monomers (styrene, methyl aciylate, butyl acrylate). From this compound various well defined rod-coil blocks copolymers with polystyrene and polyaciylate based coil blocks have been obtained. Furthermore, in each case, it is possible to random copolymeiize a second monomer for instance chloromethylstiyrene. The first monomer determines mechanical properties and phase transitions of the coil block, for example, bytulacrylate based coils have low Tg and can provide easy processabihty towards thin films. The second monomer (between 5% and 10% in molar ratio) provides the introduction of functional moieties which are necessary for a further modification in order to tune the electronic properties of the copolymer. NMRP from DEH-PPV macroinitiator 2 is schematically presented in Figure 2. 

Other functionalized monomers that were polymerized by ATRP are shown in Table HI. Using ATRP, N-vinylpyrrolidone and hydroxypropyl methacrylamide were successfully homopolymerized when a cyclam was used as the ligand instead of bipy. Methyl aciylate and vinyl acetate were copolymerized and a random copolymer with narrow molecular weight distribution was obtained. Copolymerization of isobuter and acrylonitrile monomers was also successful to prepare alternating copolymers. M alternating copolymer was also obtained when styrene and N-(cyclohexyl)maleimide... 

Poly(aciylonitrile-co-methyl aciylate-co-itaconic acid) ... 

H. A. Pelsynski, Batch and semicontinuous copolymoization of vinyl acetate and methyl aciylate, MS Report, Lehigh University, 1987 J. Delgado and M. S. El-Aasser, Makromol. Chem., Macromol. Sjmp-, 31, 63 (1990)... 

ME1 Meilchen, M.A., Hasch, B.M., Lee, S.-H., and McHugh, M.A., Poly(ethylene-co-methyl aciylate)-solvent-cosolvent phase behaviour at high pressures, Po/y/wer, 33, 1922, 1992. 

Butyl acrylate/methyl aciylate/methyl methacrylate copolymer... 

Synthesis of Aliphatic Polycarbonates and Poly(Methyl Aciylate) Derivatives... 

Poly(methyl aciylate-Z)-styrene) Poly(2-methyl-2-oxazoline-co-2-phenyl-2-oxazohne)... 

Hexyl aciylate-co-methyl aciylate Single Tg I had 5-23.7 voI% vinyl acetate II had 15-88 voI% hexyl acrylate miscibility depended on compositions of I and II Jin etal. (1992)... 

Synthesis of Poly(methyl aciylate) Grafted onto Silica Particles by Z-supported RAFT Polymerization... 

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