82221-14-5Relevant articles and documents
Water-binding solid scintillators: Synthesis, emission properties, and tests in 3H and 14C counting
Meyer, Hans-Joachim,Wolff, Thomas
, p. 2809 - 2817 (2000)
Spectral and time-resolved fluorescence properties as well as relative fluorescence quantum yields of carbodiimide derivatives of 2,5-diphenyloxazole (PPO) (prepared by H2S elimination from the corresponding thioureas), of some intermediates in the preparation, and of several other PPO derivatives were investigated in solution and in the solid state to test their suitability as solid scintillators. The carbodiimides reacted slowly with water under acidic conditions to yield ureas. These systems were compared with solid mixtures of other PPO derivatives with sodium sulfate as a drying agent, as chemically water-binding solid scintillators in 3H and 14C counting. Both the chemically and the absorptive water-binding scintillators proved capable of counting 3H and 14C decay, and open a way to the counting of aqueous samples by solid scintillators without a drying step.
Synthesis of α-Amidoketones through the Cascade Reaction of Carboxylic Acids with Vinyl Azides under Catalyst-Free Conditions
Gao, Cai,Zhou, Qianting,Yang, Li,Zhang, Xinying,Fan, Xuesen
, p. 13710 - 13720 (2020/11/13)
An efficient synthesis of α-amidoketone derivatives through the cascade reactions of carboxylic acids with vinyl azides is presented. Compared with literature protocols, notable features of this new method include catalyst-free conditions, broad substrate scope, good tolerance of a wide range of functional groups, and high efficiency. In addition, the synthetic potential of this method as a tool for late-stage modification was convincingly manifested by its application in the structural elaborations of a number of carboxylic acid drug molecules.
13C-NMR AND 1H-NMR SPECTRA OF 2,5-DIARYLOXAZOLES AND THEIR VINYLOGUES
Schiketanz, Iosif,Racoveanu-Schiketanz, Ana,Gheorghiu, Mircea D.,Balaban, Alexandru T.
, p. 1315 - 1324 (2007/10/03)
The title NMR spectra are reported for nineteen 2,5-diaryl-oxazoles and for two vinylogues, together with the corresponding assignments. The 13C-NMR spectral assignments were considerably assisted by substitution with fluorine in the 2-aryl group: five pa