A Novel Synthesis of Cyclic Polythioethers Using Liquid-Liquid Phase-Transfer Catalysis
作者:Toshio Takido、Masaharu Toriyama、Kazuhiro Ogura、Haruo Kamijo、Shigeyasu Motohashi、Manabu Seno
DOI:10.1080/10426500307887
日期:2003.6
The synthesis of cyclic polythioethers has been achieved by the reactions of dithiols with alkyl dihalides. Thiols are not only hard to handle owing to their unpleasant smell, but also they are easily oxidizable, thus it is not easy to obtain various dithiols. However, we have developed a procedure for the preparation cyclic polythioethers by the reaction of dithioiminium salts with alkyl dihalides
(EN) 1,4-Diazabicyclo AD2.2.2 BDoctane (DABCO) has been shown to extend the lifetime of several organic laser dyes in nitrogen laser pumped and flashlamp pumped dye lasers. With 0.010M DABCO, average power output in coumarin dye lasers remains at better than 90% of initial power at least three times longer than without DABCO. (FR) On a démontré que le 1,4-diazabicyclo AD2.2.2 BDoctane (DABCO) étend la durée de vie de plusieurs colorants organiques de lasers dans des lasers à colorants organiques à pompage par laser à azote et à pompage par lampe éclair. Avec 0,010 M de DABCO, la puissance de sortie moyenne dans les lasers à colorants de coumarine demeure à des valeurs supérieures à 90 % de la puissance initiale au moins trois fois plus longtemps que sans DABCO.