Photochemical bromination of methyl (E)-2-methylbut-2-enoate with N-bromosuccinimide: formation of 4-bromo-2-methylbut-2-en-4-olide - Ishii, Hisashi; Ishige, Marie; Matsushima, Yoko; Tohojoh, Toshiaki; Ishikawa, Tsutomu; Kawanabe, Eri (Journal of the Chemical Society, Perkin Transactions 1, 1985)