Reference

Chain scission in the oxidation of polyisoprene

Chain scission in the oxidation of polyisoprene. Morand, J. L. (Inst. Rech. Caoutch., Paris, Fr.). Rubber Chem. Technol., 50(2), 373-96 (English) 1977. CODEN: RCTEA4. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) Exclusion of water from the trapped mixt. from the oxidn. of polyisoprenes caused the appearance of four addnl. gas chromatog. peaks for components which could arise from chain scission to isoprene units, due to a .beta.-scission process of an alkoxy radical. These peaks were identified as 4-methyl-4-vinylbutyrolactone [1073-11-6], 4-hydroxy-2-butanone [590-90-9], and probably 4-hydroxy-4-methyl-5-hexen-2-one [63406-14-4] and 5-hydroxy-6-methyl-6-hepten-2-one [63406-15-5].

Catalytic synthesis of methyl vinyl ketone using alkaline anion-exchange resins

Catalytic synthesis of methyl vinyl ketone using alkaline anion-exchange resins. Hu, Wei; Lao, Xue-jun; Zhang, Jian; Song, Su-li (Xinchang Pharmaceutical Factory, Zhejiang Medicine Co. Ltd., Xinchang 312500, Peop. Rep. China). Jiangsu Huagong, 31(2), 47-48,60 (Chinese) 2003 Jiangsusheng Huagong Xinxi Zhongxin. CODEN: JHIUAC. 78-94-4 and 590-90-9 are cas registry numbers of chemicals which are used as reagents here. ISSN: 1002-1116. DOCUMENT TYPE: Journal CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) Section cross-reference(s): 67 The prepn. of 4-hydroxy-2-butanone, a precursor to Me vinyl ketone, by condensing acetone with HCHO over anion exchange resin catalysts is reported. The high yield and selectivity has great industrial value. .