No abstract

SynopsisA series of novel photosensitive urethane oligomers was synthesized in which methacryloyl group was contained in the hard segment. The hard segment was prepared by reacting 4,4'-diphenylmethane diisocyanate with glycerine mono methacrylate, which was successively reacted with three kinds of glycols involving l,4-poly(butadiene glycol), poly(propy1ene glycol), and poly(capro1actone diol). The mechanical properties of synthesized urethane oligomers after irradiating with ultraviolet light were evaluated to elucidate the effect of the molecular structure and the content of the hard segment on the mechanical property.

Addition reactionsAddition reactions O 0060 1,4-Addition Reaction of Ethyl Bromodifluoroacetate to Michael Acceptors in the Presence of Copper Powder Improvement of the Reaction Using TMEDA as an Additive. -Reaction of ethyl bromodifluoroacetate (II) with a variety of Michael acceptors of type (I) or (IV) is considerably improved by the addition of TMEDA. -(SATO, K.; NAKAZATO, S.; ENKO, H.; TSUJITA, H.; FUJITA, K.; YAMAMOTO, T.; OMOTE, M.; ANDO, A.; KUMADAKI*, I.; J. Fluorine Chem. 121 (2003) 1, 105-107; Fac. Pharm. Sci., Setsunan Univ., Hirakata, Osaka 573-01, Japan; Eng.) -M. Bohle 32-033