Studies on heterocycles carbon-13 magnetic resonance spectroscopy. XI. Nitrogen heterocycles. 1. 6-Substituted quinoline and quinoxaline derivatives.

The assignment of 13C nuclear magnetic resonance chemical shifts of 6-substituted quinoline and quinoxaline series were confirmed, and the additivity rules of 13C chemical shifts of 2-substituted naphthalene derivatives were approved for both 6-substituted quinoline and quinoxaline derivatives. The correlation coefficient of meta-like position is promoted by the linear combination of chemical shifts at corresponding meta position of 2-substituted naphthalene derivatives and substituent constants σπ.