Umsetzung von Methoxy‐sila‐cyclohexadienen (I) mit Natriumpulver in Tetrahydrofuran führt zu den ′l‐Silacyclohexadienylanionen (II), die durch Trimethylchlorosi‐ Ian (III) regioselektiv in α‐Stellung zu den Produkten (IV) silyliert werden.
Die 2,5‐Diaryl‐ und 2,5‐Dialkyl‐l ‐phenylarsole (III) werden durch basenkatalysierte cyclische Addition von Phenylarsan (II) an 1,3‐Diine (‐I) dargestellt.
250ChemInform Abstract The mesoionic heterocycles (I) and (IV) react with tris(trimethylsilyl)phosphine (II) to give the azaphospholes (III) or the thiaphospholes (V). The silyl ethers (III) are hydrolyzed to give the hydroxyl compounds (VI). (VIa) is converted to the carboxylates (VII). (Intermediates, 1H-, 13C-, 31P-NMR-, UV-data).
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