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Formal 2+2 and 3+2 cycloaddition reactions of 2H-chromenes with 2-alkoxy-1,4-benzoquinones: regioselective synthesis of substituted pterocarpansENGLER, T. A; REDDY, J. P; COMBRINK, K. D et al.Journal of organic chemistry. 1990, Vol 55, Num 4, pp 1248-1254, issn 0022-3263Article