Journal of the Chemical Society - Faraday Transactions p. 681 - 688 (1992)
Update date:2022-08-04
Topics:
Pal, Haridas,
Palit, Dipak K.
Mukherjee, Tulsi
Mittal, Jai P.
The spectroscopic characteristics and the kinetic parameters associated with the transients formed on one-electron oxidation of quinizarin (1,4-dihydroxy-9,10-anthraquinone), quinizarin 2- and 6-sulfonates, 1,5-dihydroxy-9,10-anthraquinone and 1,8-dihydroxy-9,10-anthraquinone have been studied by pulse radiolysis and kinetic spectrophotometric techniques, using OH., O.-, N3., Br2.- and .CH2CHO as the oxidising radicals.The pKa and the disproportionation equilibria of the semi-oxidised quinones have been studied for the water-soluble sulfonates.In contrast to the complex decay of the semi- oxidised naphthazarin (5,8-dihydroxy-1,4-naphthoquinone), the semi-oxidised anthraquinone derivatives decay by simple second-order kinetics.The pKa values of the latter are also much higher (ca. 8) compared to the former (ca. <4).The differences observed are attributed to the loss in symmetry in the free radical structures of the semi-oxidised anthraquinone derivatives.
View MoreContact:0086 371 65711996
Address:Jalan 4/3, Kawasan Perindustrian Serendah, 48000 Rawang,
Kaymossy BioChem Tech Co., Ltd
website:http://www.kaimosi.com
Contact:0571-87191913/0571-87199097
Address:Room 215, Building 3rd, No.288 Ningxia Road, Qingdao city, China
PharmaResources(Kaiyuan)CO,.Ltd
Contact:+86-21-50720028
Address:No.3, Beihuan Road, Economic Development District, Kaiyuan City, Tieling City, Liaoning Province, China 112300
Hangzhou J&H Chemical Co., Ltd.
website:http://www.jhechem.com/
Contact:+86-571-87396432
Address:No.200 Zhenhua Rd.Xihu Industrial Park, Hangzhou 310030, China
Yurui(Shanghai)Chemical Co.,Ltd
Contact:0086 21-50456736
Address:No.3188 Xiupu Road,Shanghai
Doi:10.1002/oms.1210220104
(1987)Doi:10.1246/bcsj.44.185
(1971)Doi:10.1016/S0040-4039(00)90149-7
(1965)Doi:10.1055/s-1995-4064
(1995)Doi:10.1002/hlca.200490005
(2004)Doi:10.1021/ja001996g
(2000)
