References
- Hayakawa , K. , Yamaguchi , Y. and Kanematsu , K. 1985 . Tetrahedron Lett. , 26 : 2689
- 4-Hydroxyphthalaldehyde (3b): 1H-NMR (CDCl3): σ 2.00 (br. s, 1H), 7.20 (dd, 1H, J = 2.4, 8.4 Hz), 7.43 (d, 1H, J = 2.4 Hz), 7.87 (d, 1H, J = 8.4 Hz), 10.28 (s, 1H), 10.59 (s, 1H). 13C NMR (CDCl3): σ 117.0, 120.0, 128.6, 134.9, 138.6, 161.9, 191.4, 192.6
- Greco , C. V. and Pellegrini , F. C. 1971 . Synth. Commun. , 1 : 307