Fluorogenic probes for aldol reactions: tuning of fluorescence using π-conjugation systems
作者:Isamu Katsuyama、Pandurang V. Chouthaiwale、Hiroyuki Akama、Hai-Lei Cui、Fujie Tanaka
DOI:10.1016/j.tetlet.2013.10.122
日期:2014.1
Fluorogenic aldehydes or probes for monitoring of the progress of aldol reactions have been developed. Fluorescence of benzaldehydes conjugated with aryl groups via a double or triple bond and of their aldol products was evaluated in aqueous solutions. Based on the fluorescence, fluorogenic aldol reaction substrates and retro-aldol reaction substrates were identified. Use of the probe system with optimal fluorescence properties for aldol reactions was demonstrated in assays with purified protein catalysts and with overproduced crude protein catalysts in cell lysates. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis and non-linear properties of disubstituted diphenylacetylene and related compounds
作者:Koichi Kondo、Takumi Fujitani、Noriaki Ohnishi
DOI:10.1039/a606915k
日期:——
A variety of disubstituted diphenylacetylenes and related compounds
have been synthesized by a modified Horner–Emmons reaction, and
their second harmonic generation (SHG) has been evaluated by the Kurtz
powder method. The diphenylacetylenes with weak electron-donating and
-withdrawing groups are found to be efficient for SHG, as well as having
the lowest cut-off wavelength.
Twelve imidazole based Y-shaped push–pullchromophores have been designed, synthesised and fully characterised featuring 4,5-bis(N,N-dimethylanilino)imidazole as a donor moiety, a systematically enlarged π-linker and nitro and cyano groups as acceptors. The synthesised push–pull systems have been studied by electrochemistry, UV/Vis and IR spectroscopy and nonlinearoptical properties have been calculated