Gabbutt, Christopher D., Hepworth, John D. and Heron, B. Mark (1995) Reactions of some 2H-Chromenes and 2H-Thiochromenes with triazolinediones. Tetrahedron, 51 (48). pp. 13277-13290. ISSN 0040-4020
Abstract

Simple 2H-chromenes and 2H-thiochromenes form the [2+2]-adducts, tetrahydro[1]benzo(thio)pyrano[3,4-c] [1,2]diazeto[1,2-a][1,2,4]triazoles, with triazolinediones, whereas their 3- and 4-bromo and the corresponding cycloalkylamino derivatives undergo an overall etectrophilic substitution sequence.

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