The photochemistry of cycloheptatrienes - directive effect on ring closure of a 1-electron withdrawing substituent

✍ Scribed by A.R. Brember; A.A. Gorman; J.B. Sheridan

• Publisher: Elsevier Science
• Year: 1971
• Tongue: French
• Weight: 193 KB
• Volume: 12
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)96521-9

✦ Synopsis

The light induced ring closure of cycloheptatrienes to bicycle-[3,2,0]-hepta-2,6-dienes is generally directionally specific in those cases where theoretically two bicyclic products may be formed (1). We have recently rationalised this fact in terms of the effect of eubstituents on the dirdction of polarieation in the excited state (l), which according to our analysis must be as shown in 1 for cycloheptatriene itself.