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The anions derived from the seven-membered 2-methyl-diketone (3) and the enolether (4) were alkylated resp. acylated to the 2-methyl-4-phenyl-l-benzothiepins (6), (7) resp. (8). Compound 4 could also be obtained by C-methylation of the enolether (2). The thermal decomposition of the 2-methyl-4-phenyl-l-benzothiepins yielded exclusively sulphur and the corresponding I-methyl-3-phenyl-naphthalenes (9), (10) resp. (11).

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Heterocyclische Siebenring-Verbindungen, XXIII [1] Synthese und Thermolyseverhalten von 2-Methyl-4-phenyl-l-benzothiepinen / Heterocyclic Seven-Membered Ring Compounds, XXIII [1] Synthesisand Thermolytic Behaviourof 2-Methyl-4-phenyl-1-benzothiepins