Hmamouchi, Mohammed published the artcileSynthesis and polymerization of racemic and optically active substituted β-propiolactones. V. α-Methyl-β-propiolactone, Application In Synthesis of 56970-78-6, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (1988), 26(6), 1593-607, database is CAplus.
R(+) And S(-) enantiomers of α-methyl-β-propiolactone (I) were synthesized from the corresponding α-Me β-hydroxymethylpropionates and racemic I from Me methacrylate. The corresponding racemic and optically active polylactones (II) were prepared by anionic polymerization, in bulk and in solution, as well as II of intermediate optical purities. Racemic II was amorphous whereas optically active II was semicrystalline for optical purities >51%. Melting temperatures and enthalpies of fusion of the semicrystalline II varied with optical purity whereas glass transition temperatures remained invariant for all polymers, at about -28°.
Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 56970-78-6. 56970-78-6 belongs to bromides-buliding-blocks, auxiliary class Bromide,Carboxylic acid,Aliphatic hydrocarbon chain,Inhibitor, name is 3-Bromo-2-methylpropanoic acid, and the molecular formula is C4H7BrO2, Application In Synthesis of 56970-78-6.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary