18499-89-3Relevant articles and documents
DICHLORO QUINONES AS DIENOPHILES; SYNTHESIS OF ALIZARIN DERIVATIVES
Camerom, Donald W.,Feutrill, Geoffrey I.,Keep, Philip L. C.
, p. 5173 - 5176 (2007/10/02)
2,3-Dichloro quinonoid dienophiles react with 1,3-dioxy butadienes to give cycloadducts, which aromatise with uptake of external nucleophile to give 1,2-disubstitution in the newly formed aromatic ring.With oxy nucleophiles this has led to synthesis of natural alizarin derivatives.