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Two sources of the decrease of aromaticity: Bond length alternation and bond elongation. Part II. An analysis based on geometry of the singlet and triplet states of 4nπ annulenes: C4H4, C5H5+, C6H62+, C7H7−, C8H8, C9H9+

✍ Scribed by Tadeusz M. Krygowski; Michal K. Cyrański

Book ID
108379432
Publisher
Elsevier Science
Year
1999
Tongue
French
Weight
265 KB
Volume
55
Category
Article
ISSN
0040-4020

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✍ I. Czerski; K. Kamieńska-Trela; W. Koźmiński; T. Ratajczyk; S. Szymański; J. Wój 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 154 KB

## Abstract 1,2,3,4‐tetrachloro‐5,6,7,8‐tetrafluoro‐9‐methyltriptycene was studied in NMR spectra at low temperatures where the methyl group dynamics is frozen. Values of ^5^__J__(^19^F,^1^H), ^1^__J__(^13^C,^1^H), and ^2^__J__(^1^H,^1^H) for the individual methyl protons were measured. They are in