¹³C¹³C coupling constants and substituent effects on ¹³C chemical shifts in ¹³C labelled pyrene and pyrene derivatives

Long range inter‐ring 13 C 13 C couplings are found to be effective in the title compounds, and the magnitudes of coupling constants and of substituent effects on 13 C chemical shifts, as well as the signs of the latter, alternate with respect to the number of connecting bonds.