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13 CC 13 coupling constants in dimethyl phthalate and phthalic anhydride. Determination of signs—III
Author(s) -
Hansen P. E.,
Berg A.
Publication year - 1976
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270081114
Subject(s) - phthalic anhydride , dimethyl phthalate , phthalic acid , substituent , ring (chemistry) , phthalate , chemistry , coupling constant , medicinal chemistry , polymer chemistry , photochemistry , organic chemistry , catalysis , physics , particle physics
Relative signs of 13 C 13 C coupling constants between ring carbons and carbonyl carbons in dimethyl phthalate and phthalic anhydride, 13 C‐labelled in both carbonyl groups, have been determined. The two‐and three‐bond coupling constants are shown to be positive, whereas four‐bond coupling constants are negative. Substituent effects on carbon‐carbon couplings due to a carboxyl group have been determined and effects of 5‐membered ring formation in phthalic anhydride have been observed.