2‐Bromo‐3‐substituted‐inden‐1‐ones 2 reacted with L‐cysteine or 2‐aminobenzenethiol to produce 2,3‐dihydro‐5‐phenylindeno[2,1‐b][1,4]thiazine in moderate yield or 6‐substituted‐indeno[2,1‐b][1,4]benzothiazines in good yield. The debrominated oxime and the phenylhydrazone of 2 were separated into their respective E‐ and Z‐conformers by column chromatography and their E‐ and Z‐configurations were obtained from the 1H nmr spectra.
Die Silane (I) reagieren mit Azidoameisensäure‐äthylester (II) unter Eliminierung von Stickstoff und Nitren‐Insertion zu Urethanen (III), die beim Erhitzen in Isocyanate (IV) und Äthoxysilane (V) disproportionieren.
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