Ly. Ukhin et al., THE UNUSUAL TRANSFORMATION OF 2-HYDROXY-1-NAPHTHALDEHYDE IN REACTIONSWITH MORPHOLINE, Mendeleev communications, (4), 1997, pp. 153-154
The reaction of 2-hydroxy-1-naphthaldehyde 1 with morpholine yields 4-
N-morpholino-1,2-naphthoquinone 2 (in air) or 9H-dibenzo[a,j]-9-(2-hyd
roxynaphth-1-yl)xanthene 3 (in argon).