Photolytic cleavage of the nitrogen-nitrogen single bond in benzaldehyde phenylhydrazones produced aminyl (R2N) and iminyl (R2C=N) radicals. This photochemical property was utilized in the development of hydrazones as photo-induced DNA-cleaving agents. Irradiation with 350 nm UV light of arylhydrazones bearing substituents of various types in a phosphate buffer solution containing the supercoiled circular phiX174 RFI DNA at pH 6.0 resulted in single-strand cleavage of DNA. Attachment of the electron-donating OMe group to arylhydrazones increased their DNA-cleaving activity. Results from systematic studies indicate that both the aminyl and the iminyl radicals possessed DNA-cleaving ability. (C) 2004 Elsevier Ltd. All rights reserved.
623. Polyazabicyclic compounds. Part II. Further derivatives of benzo-1 : 2 : 4-triazine
作者:R. F. Robbins、K. Schofield
DOI:10.1039/jr9570003186
日期:——
On the Thermal Stability of [60]Fullerene Cycloadducts: Retro-Cycloaddition Reaction of 2-Pyrazolino[4,5:1,2][60]fullerenes
作者:Juan Luis Delgado、Frédéric Oswald、François Cardinali、Fernando Langa、Nazario Martín
DOI:10.1021/jo702741n
日期:2008.4.1
2-Pyrazolino[4,5:1,2][60]fullerenes undergo a thermally induced retro-cycloaddition process whose efficiency is influenced by the nature of the C-substituent. C-Aryl-N-Aryl-2-pyrazolino[60]fullerenes (2a−d) poorly undergo a thermal retro-cycloadditionreaction even in the presence of a strong dipolarophile or a metal Lewis acid which, in contrast to other fullerene derivatives, shows their remarkable