Chiroptical detection during liquid chromatography, part 5: On-line measurement of circular dichroism spectra ??(?) during stops of chromatographic flow
摘要:
A procedure is described which serves to measure circular dichrograms DELTAepsilon (lambda) on line during stops of flow in liquid chromatography. Since the concentration of substrate in the spectrometer cell during the stop is not known, the differential absorption coefficients DELTAepsilon are calculated from the experimental differential absorbances DELTAA by means of UV absorption (i.e. photomultiplier voltage) data. Verifications of the procedure are obtained by its application to three substrates (Table 1), the DELTAepsilon (lambda) spectra of which were known. The present on-line technique is compared with a corresponding off-line method.The N,N-dimethylthiobenzamides 1 and 2 as well as the 9,10-phenanthrenequinone 7 consist of interconvertible enantiomers because their planar states are destabilized by steric overcrowding of groups. The unknown dichrograms DELTAepsilon (lambda) of 1, 2 and 7 are obtained (Figs. 2 and 4) and discussed with reference to the helicities of these molecules.
申请人:The United States of America, as Represented by the Secretary, Dept. of Health & Human Services
公开号:US20150119426A1
公开(公告)日:2015-04-30
Disclosed are modulators of the human relaxin receptor 1, for example, of formula (I), wherein A, R
1
, and R
2
are as defined herein, that are useful in treating mammalian relaxin receptor 1 mediated facets of human health, e.g., cardiovascular disease. Also disclosed is a composition comprising a pharmaceutically suitable carrier and at least one compound of the disclosure, and a method for therapeutic intervention in a facet of mammalian health that is mediated by a human relaxin receptor 1.
General method for nucleophilic aromatic substitution of aryl fluorides and chlorides with dimethylamine using hydroxide-assisted decomposition of N,N-dimethylforamide
作者:Juana Garcia、Jacob Sorrentino、Emily J. Diller、Daniel Chapman、Zachary R. Woydziak
DOI:10.1080/00397911.2016.1147051
日期:2016.3.3
and convenient procedure for the nucleophilic aromatic substitution of aryl fluorides and chlorides with dimethylamine was developed using a hydroxide-assisted thermal decomposition of N,N-dimethylforamide. These conditions are tolerant of nitro, nitrile, aldehyde, ketone, and amide groups but will undergo acyl substitution to form amides for methyl esters and acyl chlorides. Isolated yields of the products