Journal of Organic Chemistry p. 89 - 92 (1990)
Update date:2022-08-03
Topics:
Netto-Ferreira, J.C.
Avellar, I.G.J.
Scaiano, J.C.
The photochemistry of a series of 10 α-(aryloxy)acetophenones has been examined by quantum yield, product studies, and laser flash photolysis techniques.Triplet decay involves a competition of β-cleavage with intramolecular quenching by the β-aryl group, the latter being favored in all systems.Typical triplet lifetimes at room temperature range from 60 to 260 ps and are rather insensitive to the substitution pattern. β-Cleavage rate constants range between 1*107 and 3*109 s-1 and are strongly favored by electron releasing substituents, such as 4-methoxy.The determination of true quantum yields of β-cleavage requires the addition of thiophenol as a radical trap to prevent the efficient back reaction that takes place otherwise; under these conditions quantum yields range from 10-3 to 0.14, the highest value being obtained for the 4-methoxy and 4-hydroxy derivatives.
View Morewebsite:http://www.tcfinechem.com/
Contact:18681346930
Address:baifu town,whou district
YanCheng LongShen Chemical Co.,Ltd.
Contact:+86-515-86668866
Address:No.13,Weiyi Road,Funing Aoyang Industrial Park
Beijing Top Science biological technology co., LTD
Contact:+86-13439059536
Address:15-1705 jre three mile, Beijing 100000,CHINA
SHANDONG AONA CHEMICAL CO.,LTD.
Contact:86-532-85762926
Address:LIUYUAN TOWN, ZAOZHUANG CITY, SHANGDONG PROVINCE.
Shandong Dayi Chemical Co., Ltd.
website:http://www.dayi.com.cn
Contact:+86- 535-7388728. 15306386031
Address:No 1 Danya west road, Laiyang City, Shandong province
Doi:10.1021/jo000508k
(2000)Doi:10.1007/s11426-012-4675-x
(2012)Doi:10.1039/c29700001225
(1970)Doi:10.1039/j39700002478
(1970)Doi:10.1016/S0014-827X(00)00052-5
(2000)Doi:10.1021/jo000139s
(2000)