ISSN:
0749-1581
Schlagwort(e):
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
13C NMR shifts for ethyl (E)-(α-cyano)cinnamates, (E)-(α-cyano)cinnamamides and ethyl (α-ethoxycarbonyl)cinnamates of general formula XC6H4CH=CR1R2 (R1 = CN, R2 = COOEt; R1 = CN, R2 = CONH2; R1 = R2 = COOEt; X =p-NMe2, p-OH, p-OMe, p-Me, H, p-Br, p-Cl, p-NO2, m-Cl, m-NO2, o-OMe, o-CI, o-NO2) in DMSO-d6 solution are reported. Substituent chemical shift considerations allow the assignment of the aromatic carbons in the disubstituted rings. The effect of substituents on the aromatic, ethylenic, cyano and carbonyl chemical shifts is discussed in relation to that of other arylethylenes. The J(CCCH) long-range coupling values provide evidence in favour of the E configuration for both series of cyano derivatives.
Zusätzliches Material:
3 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260240108
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