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13 C, 13 C coupling constants in anthracene, 9,10‐dihydroanthracene and phthalic acid derivatives. Determination of signs by the symmetrical double labelling (SDL) method V
Author(s) -
Hansen P. E.,
Berg A.
Publication year - 1979
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.1270120111
Subject(s) - anthracene , naphthalene , phthalic anhydride , chemistry , pyrene , ring (chemistry) , medicinal chemistry , benzene , double bond , phthalimide , coupling constant , organic chemistry , photochemistry , physics , particle physics , catalysis
Carbon‐13, carbon‐13 one‐bound and long‐range coupling constants are determined for anthracene and 9,10‐dihydroanthracene labelled in the 9,10‐positions, and for thiophthalic anhydride and phthalimide, labelled in both carbonyl groups. Relative signs are determined by the SDL method. Signs in naphthalene, anthracene and pyrene derivatives are discussed. The general trends observed in many aromatic compounds, 3 J |>| 2 J |>| 4 J | and 2 J positive, 3 J positive, 4 J negative are mostly confirmed. However, evidence suggests that two‐bond couplings between carbon atoms in the same ring in aromatic hydrocarbons are negative.