Large CC spin–spin coupling constants across double bonds. Validity of the multiplicative approach

✍ Scribed by Krystyna Kamieńska-Trela; Zenobia Biedrzycka; Andrzej Da̧browski

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 422 KB
• Volume: 29
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1260291210

✦ Synopsis

Abstract

^13^C^13^C spin–spin coupling constants have been measured for a series of variously substituted ethenes. The largest ^1^J(CC) value, 172 Hz, was found in chlorotrifluoroethene and the smallest, 45.3 Hz, in tris(trimethylsilyl)ethene, which covers a range of 127 Hz for the ^1^J(CC) values. An analysis of the data revealed a large discrepancy between the experimental ^1^J values and those estimated by the commonly used additive increment scheme. Good agreement was found, however, between the experimental values and those calculated by means of a multiplicative scheme.