PMR investigation of organic cations—I: Trithienyl methyl carbonium ions

✍ Scribed by F. Taddei; P. Spagnolo; M. Tiecco

• Book ID: 102524387
• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 307 KB
• Volume: 2
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.1270020208

✦ Synopsis

Abstract

PMR spectral parameters are reported for the isomeric trithienyl carbonium ions. The low field shifts, relative to the corresponding carbinols, are discussed in relation to the delocalization of the positive charge into the thiophene ring bonded in position 2 or 3. A linear correlation is found between chemical shifts and π‐charge densities and the proportionality constant is higher than that previously found for benzene derivatives. Vicinal coupling constants in these systems are satisfactorily in agreement with the corresponding calculated π‐bond order.