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- W2142061091 abstract "Abstract A potentially useful simple method is proposed to determine whether the N-phenyl rings in the analgesic drug, antipyrine (and analogs), preferentially exist in a conformation which is approximately coplanar with, or is perpendicular to, the five-membered heterocyclic rings. The method is based on the magnitude of “spectral dispersion,” that is, the degree of NMR chemical shift differences for the proton and the protonated carbon signals of the N-phenyl. A narrow range of chemical shifts is considered suggestive of a preferred perpendicular conformation, which reduces mesomeric effects of conjugation and minimizes steric hindrance with nearby groups. Representative chemical shift data for model compounds are presented." @default.
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- W2142061091 date "1997-12-01" @default.
- W2142061091 modified "2023-09-27" @default.
- W2142061091 title "NMR Studies of Drugs: Antipyrine and Analogs. II.1H and13C Chemical Shift Dispersion as Conformation Indicator for theN-Phenyl Ring." @default.
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- W2142061091 doi "https://doi.org/10.1080/00387019708006752" @default.
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