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Stereochemistry of Seven-Membered Heterocycles: XLI. Stereoselective Synthesis of 3-R-1,5-Dihydro-2,4-benzothiepine 2-Oxides

✍ Scribed by P. A. Kikilo; B. I. Khairutdinov; R. A. Shaikhutdinov; Yu. G. Shtyrlin; V. V. Klochkov; E. N. Klimovitskii

Book ID: 110311491
Publisher: Springer
Year: 2001
Tongue: English
Weight: 57 KB
Volume: 71
Category: Article
ISSN: 1070-3632
DOI: 10.1023/a:1012304123411

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## Abstract α‐Aryl‐__o__‐xylyl dibromides **1** reacted with thioureas to give the mono‐isothiouronium salts **2**, bis‐isothiouronium salts **4** being formed as by‐products in some cases. Compounds **2**, which readily reacted with water or alcohols to form **3**, were cyclized with Na~2~CO~3~ in