Tert-Butylacrylate

The availability of a general procedure to prepare 4-alkyl-2-(trifluoromethyl)-5(2F0-oxazolones 12 from a-amino acids and TFAA, and taking into account the tautomerization process, has led to many efforts to direct the alkylation reaction toward C-2 or C-4. For example, in the presence of triethylamine, Michael addition of 12 occurs at C-2 when tert-butylacrylate is used as electrophile. The resulting... 

The activation of benzene by 171 has also been reported in the presence of tert-butylacrylate, in this case affording Tp Rh(C6H5)(CH2CH2C02 Bu) (326), believed to arise from alkene insertion into the intermediate rhodium hydride Tp RhH(C6H5)(f/ -CH2 = CHC02 Bu). It is also reported that irradiation of 173 in ether/P(OMe)3 yields Tp RhH(OEt) P(OMe)3) (327), presumed to result from P(OMe)3 intercepting the initial photoproduct Tp Rh , with subsequent oxidative addition of an ethereal C-O bond and loss of ethylene. ... 

COD) (171) in the presence of tert-butylacrylate results in insertion of the acrylate into the Rh-H bond of the undetected intermediate Tp RhH(C6H5) (f/ -CH2 = CHCO2 Bu), thereby affording Tp Rh(C6H5)(CH2CH2C02 Bu) (326). Photochemical activation of diisopropylamine has been observed upon irradiation of pentane solutions of Tp Rh(CO)2 (469) with excess of the amine, resulting in formation of the novel metallacycle 470. This reaction is reported to proceed diastereoselectively, but efforts to develop the chemistry of 470 were fruitless, and it has not been further studied. 

Combination of anionic polymerization and post polymerization reactions has been used for the synthesis of poly(acrylic acid-b-N,N-diethylacrylamide) (PAA-PDEA) copolymers [9]. Initially the synthesis of a precursor poly(tert-butylacrylate-b- N,N-diethylacrylamide) (PtBMA-PDEAAm) block copolymer was realized via sequential anionic polymerization of the tert-butyl acrylate and diethylacrylamide monomers. However, an amount of PtBMA homopolymer was detected in the crude reaction product. In order to remove the vast majority of the homopolymer, the authors proposed the precipitation of the crude product in hexane, where the homopolymer is highly soluble, in contrast to the block copolymer. The piuified block copolymer was subjected to deprotection of the tert-butyl group in acidic media, leading to the desirable DHBC. The final block copolymer showed pH and thermosensitive solution aggregation. 

Finally, composition gradients from two different polymer chains have also been used to study wettability effects. A polystyrene poly(2-vinylpyridine) gradient allows a switchable wettability if submitted to a selective solvent treatment. In the selective solvent, one of the two chains collapses and the properties of the surface are determined by mainly the other component. The same effect can be exploited when submitting a polyelectrolyte gradient (poly(tert-butylacrylate) vs. poly(2-vinylpyridine)) to a pH change, Fig. 19. 

Hautekeer, J.R, Varshney, S.K., Fayt, R., Jacobs, G., JerOme, R. and Teyssi, Ph. (1990) Anionic polymerization of acrylic monomers. Synthesis, characterization and modification of polystyrene-poly(tert-butylacrylate) di- and triblock copolymers. Macromolecules, 23,... 

V-y R = -C(CH,), rPE-g-poly(tert-butylacrylate) PE-g-poly(acrylic acid)... 

Poly(A -isopropylacrylamide-co-A -tert-butylacryl- amide) water 1987PRI... 

Durmaz, H., Kaiatas, F., Tunca, U., and Hizal, G. (2(X)6b) Preparation of ABC miktoarm star terpolymer containing polyfethylene glycol), polystyrene, and poly(tert-butylacrylate) arms by combining Diels-Alder reaction, atom transfer radical, and stable free radical polymerization routes. Journal of Polymer Science Part A-Polymer Chemistry, 44,499. 

In the approach of Goti and Cardona to (-l-)-hyacinthacine Ai and its analogs, o-ribofuranose-derived nitrone 150 was subjected to a 1,3-dipolar cycloaddition with tert-butylacrylate which provided a mixture of diastereomeric oxazolidines 151 and 152 dr= 1.5 1 Scheme 32). ... 

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