Additions and Corrections: Synthesis of Cyclobutenes by the Novel Photochemical Ring Contraction of 4-Substituted 2-amino-3,5-dicyano-6-phenyl-4H-pyrans (The Journal of Organic Chemistry (1989) 54(13) (3069–3072) (10.1021/jo00274a021))

1. Armesto, D.
2. Horspoo, W.M.
3. Martin, N.
4. Ana, R.
5. Carlos, S.