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Abstract:The effect of several surfactants on peroxyoxalate chemiluminescence (PO-CL) using oligophenylenevinylene fluorophores was investigated. Among several oligophenylenevinylenes consisting of some stilbene units, linearly conjugated ones, such as distyrylbenzene and distyrylstilbene, effectively enhanced PO-CL efficiency. Various effects of anionic, cationic, amphoteric and non-ionic surfactants on the CL efficiency of PO-CL were determined using three oxalates and the distyrylbenzene fluorophore. Anionic and non-ionic surfactants effectively enhanced CL efficiency, in contrast to the negative effect of cationic and amphoteric surfactants.Non-ionic surfactants were also effective in CL reactions of oxalates bearing dodecyl ester groups by the hydrophobic interaction between their alkyl chains. Considering these results, the surfactants not only increase the concentrations of water-insoluble interacting species in the hydrophobic micelle cores, but also control rapid degradation of the oxalates by alkaline hydrolysis.

Amino acids U 0400Asymmetric Alkylation of Glycine Imine Esters Using Solid Supports Preloaded with Base. -Based on recent investigations, the factors affecting the enantioselectivity and the rate of the title reaction are determined. Optimized conditions for the alkylation of Schiff base (III) are applied to the reaction with alkyl halides. In the presence of residual water on the support, the reactions are dramatically accelerated to be complete within a few minutes. -(YU, H.; TAKIGAWA, S.; KOSHIMA*, H.; Tetrahedron 60 (2004) 38, 8405-8410; Dep. Appl. Chem., Fac. Eng., Ehime Univ., Matsuyama, Ehime 790, Japan; Eng.) -Klein 01-164