Some acyl derivatives of 2,6-dimethoxyanthracene
Abstract
Two-step acylation of 2,6-dimethoxyanthracene with acetyl chloride followed by crotonoyl chloride leads successively to the corresponding 1-acetyl- and 1-acetyl-5-crotonoyl derivatives. Acylation at the 9-position requires an indirect procedure; e.g., 9-formylation is effected by the action of dimethylformamide on the corresponding lithio-derivative. 2,6-Dimethoxy-9-anthraldehyde, so obtained, is relatively unstable and readily converted into 2,6-dimethoxyanthraquinone.