Hideo Kise

Properties of water in hexadecyltrimethylammonium bromidechloroform system

Abstract The properties of water in the hexadecyltrimethylammonium bromide (HTAB) chloroform reversed micellar system were investigated. In this system, two types of water are discriminated from measurements of near-infrared spectra and NMR spectra. A sharp band at 1899 nm is assigned to the water dispersed in the bulk organic phase and a broad band around about 1950 nm is assigned to that solubilized in the micellar cores. NMR spectra are split into the contributions of the two types of water. The water in micellar cores has a shorter relaxation time and a lower-field chemical shift than the water in organic phase. Further, the water in the micellar cores is divided into two types: one is strongly interacting with the polar head groups of HTAB and the other is more free but interacting with the water around the head groups of HTAB.

Phase transfer catalysis of modified dextran anion exchangers

Abstract Dextran anion exchangers with lipophilic substituents have been synthesized, which were found to be useful as phase transfer catalysts for displacement and hydrogenation reactions under triphase conditions.

Cationic Telomerization of Isoprene with Phenyl Chloride

イソプレン (IP) と塩化プレニル (PC) とのカチオソテロメル化反応を行ない, 溶媒 ,触媒, 反応率, 反応試剤の比率等の変化によるテロマーの重合度や構造の変化を検討した。テロマーのうち, テローゲンとタクソーゲンの1対1付加物 (C10 テロマー) を蒸留で分離し, 加水分解したのち薄層クロマトグラフィーで同定した。その結果, ゲラニオール, リナロールが主生成物であることを確認した。触媒として, 塩化メチレン溶媒中では塩化第ニスズのアルコール付加物を, またエーテル中では塩化第二鉄を用いた。これらは反応の制御が容易で再現性も良い。生成テロマーの平均重合度は反応率の増加と共に増大するが, PC/IP 比にはそれほど影響されない。これは PC の重合およびテロマーの分枝に起因すると考えられた。