The complete assignment of the 1H and 13C NMR spectra of eight thienyl-substituted chromenes was achieved by the concerted application of homonuclear (gs-COSY), 1H-detected heteronuclear one-bond (gs-HMQC) and long-range (gs-HMBC) gradientselected correlation experiments.
The 1H and 13C chemical shifts for some tetrakis(para-substituted phenyl)ethylenes
✍ Scribed by William B. Smith
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 174 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The proton and carbon chemical shifts for a series of tetrakis(p‐substituted phenyl)ethylenes are described. Assignments followed routine substituent chemical shift trends. Both proton and carbon chemical shifts ortho to the varying substituent follow the empirical parameter, Q. The ethylene carbon chemical shifts are proportional to those at the position para to the varying substituent.
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