Reduction of dixanthylidene with potassium or lithium resulted in formation of the antiaromatic dianion in high yield. Attempts to form the dianion by excited-state deprotonation of dixanthene with n-butyllithium/TMEDA resulted in formation of the tetraanion from deprotonation ortho to the oxygen. Orientation of the sp3 hydrogens presumably allows preferential deprotonation of the xanthene rings.
Die aus Aldehyden und Chloroform in Gegenwart von Alkali oder durch Grignardreaktion mit Chloral gewonnenen Addukte (I) werden mit Anisol (II) in die Methoxychlor‐Analoga (III) übergeführt.
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