Effect of co-adsorbed water on photodimerization and photooxygenation of 4-methoxystyrene included in NaY

✍ Scribed by Chie Matsubara; Masanobu Kojima

• Book ID: 104261294
• Publisher: Elsevier Science
• Year: 1999
• Tongue: French
• Weight: 242 KB
• Volume: 40
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(99)00510-9

✦ Synopsis

Irradiation of 4-methoxystyrene (1) in zeolite NaY under vacuum, dry oxygen, and wet air yielded dimers and oxygenation products dependent on the atmosphere and co-adsorbed water. Head-to-head c/s-and trans-cyclobutane dimers of I were produced at the isomer ratio of 91/9 under vacuum through excimer of 1 and 38/62 under wet air through cation radical of 1, respectively. However, 4-methoxybenzaldehyde was a primary product under dry oxygen at the expense of production of the dimers (clt ---81/19). These results show significant differences in the photochemical behavior of 1 in solution and in NaY.