2,11-Dithia[3.3]metacyclophane-9-carboxylic acid tert-butyl ester
✍ Scribed by Albert, B. ;Jansen, M. ;Güther, R. ;Vögtle, F.
- Book ID
- 114510347
- Publisher
- International Union of Crystallography
- Year
- 1993
- Tongue
- English
- Weight
- 201 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0108-2701
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The preparation, 1 Hmr spectra and stereochemistry of 1E ,3E,2F, 3F and 2G are described. The stereochemistry of 3E is supported by an X-ray structure determination. The synthesis and stereochemical aspects of cyclophanes have been of particular interest over the last two decades. 2,3 However, recen
Carboxylic acids were activated in the presence of DMAP with tert-butyl carbonates (BOC-OX) 1, which were prepared in situ by reaction of X-OH and di-tert-butyl dicarbonate (BOC 2 O). The most efficient active carbonate proved to be tert-butyl 3-(3,4-dihydrobenzotriazine-4-on)yl carbonate 1a, leadin