N ‐Nitrosodecahydroquinolines 3 ‐Nitrogen‐15 Nuclear Magnetic Resonance Spectra

15 N Chemical shifts of N ‐nitroso‐ trans ‐decahydroquinoline, N ‐nitroso‐ cis ‐decahydroquinoline, of 12 methyl‐or t ‐butyl‐substituted N ‐nitrosodecahydroquinolines and of N ‐nitroso‐ trans‐syn‐trans ‐perhydroacridine are reported. Shift effects for N ‐nitrosation were calculated by comparison with the parent amines. Shift effects for ring substitution, obtained by comparison with the data of N ‐nitrosopiperidine, are of similar direction and magnitude as in the parent amines for the ring nitrogens (N‐1). Methyl substitution nearly always causes deshielding for the nitroso nitrogens (N‐2), with a very large deshielding if the planarity of the (C‐α) 2 NNO region is disturbed.