557794-38-4Relevant articles and documents
A stable isotope labeling dapsone synthetic method
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Paragraph 0189; 0195; 0196, (2017/04/19)
The invention relates to a synthetic method of stable isotope labeled aminophenylsulfone. The method comprises the following steps: by taking stable isotope labeled p-nitro halogeno benzene as a raw material, carrying out nucleophilic substitution to generate stable isotope labeled 4, 4'-dinitro phenyl sulfide; oxidizing to obtain stable isotope labeled 4, 4'-dinitro diphenyl sulfone; and finally carrying out reaction with a reducing agent to obtain the stable isotope labeled aminophenylsulfone. Compared with the prior art, according to the stable isotope labeled aminophenylsulfone prepared by the invention simply separated and purified, the chemical purity reaches over 99% and the isotope abundance is 99%, so that the demand of aminophenylsulfone detection of forbidden sulfonamides in the field of food safety can be fully satisfied.
Deuterated Polyimides and Derivatives Thereof
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Page/Page column 18, (2010/11/30)
The object of the present invention is to provide a polyimide compound useful as a raw material of a polymer for an optical waveguide that has excellent transparency and heat resistance, low moisture absorption, a small optical transmission loss, a high r