Treatment of 2,2-dimethyl-2H-chromene derivatives (precocenes)(1) with benzeneselenenyl chloride in methylene dichloride solution affords a mixture of unusual phenylselenenylation products (7), (8), and (9) instead of the expected addition derivatives (3). In the case of 6-unsubstituted chromenes (1a,d,e), C-6 aromatic substitution (phenylselenenylation) takes place also.
P. Wagner, H. Duddeck, T. Tímár, É. Csuhai and J. Cs. Jászberényi, J. Chem. Soc., Perkin Trans. 1, 1989, 2128 DOI: 10.1039/P19890002128
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