Angela Sandulache, Artur M. S. Silva, and José A. S. Cavaleiro
Diels–Alder reactions of chromone-3-carboxaldehydes with ortho-benzoquinodimethane. New synthesis of benzoxanthones
Tetrahedron Volume 58, Issue 1 Pages 105-114
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http://dx.doi.org/10.1016/S0040-4020(01)01131-0Спасибо!
