Journal of Physical Chemistry p. 8190 - 8195 (1995)
Update date:2022-07-30
Topics:
Mathivanan, N.
Johnston, L. J.
Wayner, D.D.M.
The radical anions of a series of substituted α-(aryloxy)acetophenones have been generated by trapping the solvated electron produced by 355-nm laser-induced photoionization of 4,4'-dimethoxystilbene in either acetonitrile or dimethylformamide (DMF).The radical anion of the parent ketone, α-phenoxyacetophenone, has λmax at 500 nm and decays with a rate constant 7 x 1E5 s-1.This rate constant reflects the rate of β-cleavage to generate phenoxide ion and phenylacyl radical.The rate constant for β-cleavage decreases for ketones with electron donating substituents in the α-aryloxy ring.Substituent effects on the acetophenone ring are in the opposite direction, and many of the 4-substituted (aryloxy)acetophenones have half-lives in excess of 10 μs that reflect a combination of second order processes and are not limited by β-cleavage.The generality of the photoionization/electron trapping method for the generation of radical anions of ketones with short-lived excited states that preclude direct excitation is illustrated by its application to other aryl ketones that undergo α-cleavage, β-phenyl quenching, and intramolecular hydrogen abstraction reactions.
View MoreShanghai Rainbow Chemistry Co., Ltd.
Contact:+86-21-64968086-5815/5812
Address:3rd floor, Building 7, 251 Faladi Road, Zhangjiang Hi-Tech Park, Pudong District, Shanghai, P.R. China
Linyi Shengxin Pharmaceutical R&D Co., Ltd
Contact:+86-18653953873
Address:West First of Yufeng Road, Yishui County
Qingdao Kylin Trading Co., Ltd.
Contact:0086-532-68979884/58972912/68972263/65/88171519
Address:Room 2308,A building International Trade Center No.230 Changjiang Middle Road of Qingdao Economic Development Zone,Shandong,China.
FOSHAN NANHAI ZHONGNAN PHARMACEUTICAL FACTORY
Contact:0086-0757-85609331
Address:XIAHENGTIAN INDUSTRIAL ZONE,SHAYONG VILLAGE,LISHUI TOWN
Hebei Think-Do Environment Co., Ltd
website:http://www.thinkdo-environment.com
Contact:0311-86510809
Address:No 6, Shilian Middle Street, Circular Chemical Industry Park
Doi:10.1016/0040-4020(95)00220-3
(1995)Doi:10.1023/A:1016239321494
(1995)Doi:10.1248/cpb.48.245
(2000)Doi:10.1021/ja01221a006
(1945)Doi:10.1016/0040-4039(95)00056-I
(1995)Doi:10.1021/jo01272a031
(1968)