An unusual Beckmann rearrangement was discovered in the reaction of 3,4-bis(2,5-dimethyl-3-thienyl)cyclobut-3-ene-1,2-dione with hydroxylamine hydrochloride to give esters of 2,3-bis(2,5-dimethyl-3-thienyl)-3-cyanoacrylic acid.
Synthesis of photochromic 2,3-bis(2,5-dimethyl-3-thienyl)-3-cyanoacrylates by the Beckmann rearrangement of a cyclobutenedione derivative
V. Z. Shirinian, M. M. Krayushkin, V. A. Barachevskii, L. I. Belen'kii, A. A. Shimkin and Y. P. Strokach, Mendeleev Commun., 2004, 14, 202 DOI: 10.1070/MC2004v014n05ABEH001916
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