Muneer, M. ; Ajayagosh, A. ; Das, S. ; George, M. V. (1995) Phototransformations of di-O-ethyl S,S-terephthaloyl dixanthate and terephthaloic bis(piperidinedithiocarbamic anhydride) Journal of Photochemistry and Photobiology A: Chemistry, 86 (1-3). pp. 155-159. ISSN 1010-6030
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/101060...
Related URL: http://dx.doi.org/10.1016/1010-6030(94)03935-N
Abstract
The phototransformations of di-O-ethyl S,S-terephthaloyl dixanthate (3a) and terephthaloic bis(piperidinethiocarbamic anhydride) (3b) were investigated by steady state and nanosecond laser flash photolysis. Irradiation of 3a and 3b in benzene resulted in the formation of terephthalic acid in good yields on work-up. The 308 nm laser pulse excitation of these substrates in benzene gave rise to transient species, identified as radical intermediates, produced via C(=O)-S bond scission. These decayed by second-order kinetics and were quenched by free radical quenchers, such as oxygen, 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) and 4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl (HTEMPO). Based on these studies, a reasonable pathway has been suggested for the phototransformations of 3a and 3b.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Phototransformation; S, S-terephthaloyl Dixanthate; Terephthaloic Bis(piperidinedithiocarbamic Anhydride) |
| ID Code: | 12665 |
| Deposited On: | 12 Nov 2010 15:34 |
| Last Modified: | 31 May 2011 07:13 |
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