Studies with Stable Carbonium Ions

✍ Scribed by Doz. Dr. H. Volz

• Book ID: 101544159
• Publisher: John Wiley and Sons
• Year: 1968
• Tongue: English
• Weight: 141 KB
• Volume: 7
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196802341

✦ Synopsis

According to HMO calculations the cyclopentadienyl cation in the ground state should have an open molecular shell and triplet character. If the Jahn-Teller effect intervenes, the character of the open molecular shell is retained but the ground state should show singlet character. ESR studies of pentaphenylcyclopentadienyl hexachloroantimonate [I] indicate that the molecule has singlet character in the ground state. An open molecular shell is also obtained by HMO calculation for the indenyl and the fluorenyl cations [*I, whose thermodynamic stabilities are accordingly appreciably less than those of the isoelectronic diarylrnethyl and triarylmethyl