The pyridinium-betaine of squaric acid
✍ Scribed by Kolev, Tsonko ;Yancheva, Denitsa ;Shivachev, Boris ;Petrova, Rosica
- Publisher
- International Union of Crystallography
- Year
- 2007
- Tongue
- English
- Weight
- 808 KB
- Volume
- 63
- Category
- Article
- ISSN
- 1600-5368
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Single-crystal X-ray study T = 293 K Mean '(C±C) = 0.003 A Ê R factor = 0.044 wR factor = 0.107 Data-to-parameter ratio = 10.9 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.
Single-crystal X-ray study T = 293 K Mean (C-C) = 0.003 A R factor = 0.043 wR factor = 0.112 Data-to-parameter ratio = 12.2 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.
## Abstract A series of substituted pyridinium betaines of squaric acid have been prepared by quaternization reaction of 3‐ and 4‐substituted pyridines with squaric acid. The products were characterized by means of elemental analysis, melting points, and their UV‐vis and IR spectra. The UV‐vis spec
A., owing to the variation possible in conformational preference. The carbonyl oxygen distance from the center of the triple bond ranges from 3.1-4.2 A. An allowed pattern of atoms can thus be drawn for oxotremorine, Fig. . This calculated energy-allowed pattern clearly mirrors the muscarinic patte