Journal of Organic Chemistry p. 2533 - 2538 (1985)
Update date:2022-08-04
Topics:
Murty, Bulusu A. R. C.
Pratapan, Sreedharan
Kumar, Challa V.
Das, Paritosh K.
George, Manapurathu V.
The photochemistry of bridgehead-substituted dibenzobarrelenes 1a-h (Scheme I) has been investigated by steady-state photolysis, product analysis, and time-resolved laser flash photolysis. 4b-Substituted dibenzosemibullvalenes 8b,c,f,g are formed as major photoproducts from dibenzobarrelenes 1b,c,f,g,bearing acetoxy, formyl, ethyl, and methoxy 9 -bridgehead substituents, whereas 8b-substituted dibenzosemibullvalenes (or products derived from them) (7 and 6e) are formed from 9-hydroxy- and 9-cyano-substituted dibenzobarrelenes 1a,e.Laser flash photolysis gives rise totransient phenomena attributable to the triplets of dibenzobarrelenes (ΦT = 0.2-0.7 in benzene).These are characterized by broad and diffuse absorption spectra, short lifetimes (0.07-11 μs), and varying degrees of quenchability by azulene, ferrocene, β-carotene, and p-methoxyphenol.The rate constants for triplet quenching by the latter quenchers as well as oxygen and di-tert-butylnitroxy radicals are presented.
View MoreZhejiang kehong chemical co., ltd
Contact:0086-575-85522000
Address:xiner center RD binhai industrial zone shaoxing zhejiang province P.R.China,312073
Airsea(Taizhou) Pharmaceutical Limited
Contact:+86-576-88057622
Address:Dubei, Duqiao, Linhai, Taizhou, Zhejiang, China Zip: 317016
Nanjing chemipioneer pharmaceutical & technology Co., LTD
website:http://www.chemipioneer.com.cn
Contact:+86-25-52685700
Address:Room 305,A Block,Biological-Medicine Building,Business Start-up Center,Xin-ke 1st Road, High-tech development zone,Nanjing city,Jiangsu Province, China
Shantou Baokang Pharmaceutical Co., Ltd.
Contact:+86-754-88873487
Address:5/F B Block Huangshan Bldg Huangshan Rd Shantou
SHOUGUANG BOYU CHEMICAL CO.,LTD
Contact:+86-536-8256719
Address:ROOM 1101&1103,BUILDING D,ZHONGTU MANSION,NO.6565 EAST FUSHOU STREET,WEIFANG CITY,SHANDONG,CHINA.
Doi:10.1039/c39860000102
(1986)Doi:10.1021/jm00147a030
(1985)Doi:10.1021/ja00868a044
(1962)Doi:10.1002/ardp.19853180407
(1985)Doi:10.1007/BF00951283
(1985)Doi:10.1016/S0040-4039(01)92376-7
(1981)