Benzopyran-2-carboxylic acids in the prevention of asthmatic symptoms
申请人:Fisons Limited
公开号:US03952104A1
公开(公告)日:1976-04-20
There are described certain mono-chromone-2-carboxylic acids of formula, ##SPC1## Having one substituent in the 5 or 6 position or having 2 or more substituents in the 5,6,7 or 8 positions. There are also described processes for making the compounds and pharmacetuical compositions, for the treatment of asthma, containing the compounds.
The use of a paramagnetic shift reagent for the structural determination of ethyl 4-oxo-4H-1-benzopyran-2-carboxylates
作者:H. Cairns、D. Hunter、J. King、N.H. Rogers
DOI:10.1016/s0040-4020(01)97220-5
日期:1974.1
The effect of a paramagneticshiftreagent on the PMR of ethyl 4-oxo-4H-1-benzopyran-2-carboxylates is described. Displacements of proton signals are discussed in terms of preferred co-ordination sites in the substrate molecules. The technique is shown to be particularly useful in distinguishing between structural isomers.
描述了顺磁性转移试剂对4-氧代-4 H -1-苯并吡喃-2-甲酸乙酯的PMR的影响。根据底物分子中优选的配位位点讨论了质子信号的位移。已表明该技术在区分结构异构体方面特别有用。