Dihydro-dibenzophenanthrene derivatives 1a (1b) were synthesised in order to obtain the NMR shielding parameters for naphthalene ring. The 1H NMR assignment of 1a and substituent-induced shifts (SIS) from the corresponding androstanone ethylene ketal (2) are presented. A simple sum of the magnetic shielding of benzene rings can satisfactorily reproduced the observed SIS values due to the naphthalene ring of 1. © 2001 Elsevier Science Ltd.
Iwamoto, H., Kawatani, T., & Fukazawa, Y. (2001). Estimation of magnetic anisotropy in polycyclic aromatics. Tetrahedron Letters, 42(8), 1551–1553. https://doi.org/10.1016/S0040-4039(00)02283-8