An EPR study of the reaction of tetrabutylammonium borohydride with N-Heterocycles
作者:Marco Lucarini、Gian Franco Pedulli
DOI:10.1016/0022-328x(94)05358-i
日期:1995.5
The reactions between tetrabutylammoniumborohydride and a series of nitrogen-containing heteroaromatics bases have been investigated by electron paramagnetic resonance (EPR) spectroscopy. The radical anions of the N-heterocycles, formed by a single electron-transfer process have been observed with substrates having reduction potentials higher than - 1.2 V vs. SCE. With less reducible bases, the radical
Regioselectivity of the addition of Group IVB organometallic radicals to substituted benzo[2,1,3]thiadiazoles. An ESR investigation
作者:Angelo Alberti、Massimo Benaglia、Dea Forentini Dal Monte、Marco Lucarini、Gian Franco Pedulli
DOI:10.1016/0022-328x(91)86190-2
日期:1991.1
Silyl, germyl, stannyl radicals have been reacted with a variety of ring substituted benzo[2,1,3]thiadiazoles, and the paramagnetic adducts resulting from addtion to one of the heterocyclic nitrogens have been characterized by means of ESR spectroscopy. Reactions with unsymmetrically substituted substrates lead to the formation of two distinct isomeric adducts, whose relative amounts depend on the
作者:A.S. Angeloni、V. Ceré、D. Dal Monte、E. Sandri、G. Scapini
DOI:10.1016/0040-4020(72)80137-6
日期:1972.1
derivatives of 5-oximinobenzo-2,1,3-oxadiazole-4-one is reported and their rearrangement to 4,7-dioximino derivatives of benzo-2,1,3-oxadiazole, 2-phenylbenzotriazole and benzotriazole described. Geometricisomerism related to oximino group was investigated. NMR spectra of 4,7-dioximes show the existence in solution of three geometricalisomers, whose configuration was assigned. The derivatives of 5-oximinobenzo-2
An efficient synthetic approach to a series of aceno[2,1,3]thiadiazole derivatives is described. 2-TIPS and 2-TES molecules exhibited different crystal packing;, and 2-TIPS show good device performances with hole mobility up to 0.4 cm(2) V(-1) s(-1) and an average mobility of 0.15 cm(2) V(-1) s(-1) as the active material for organic field-effect transistors. All of the results demonstrate these aceno[2,1,3]thiadiazole derivatives as promising materials for optoelectronic devices.
Synthesis, antileukemic evaluation and peroxidating ability of heterosubstituted anthracene-9,10-dione analogues: 5,8-[(aminoalkyl)amino]naphtho[2,3-d]thiazole-4,9-diones and 5,8-[(aminoalkyl)amino]naphtho[2,3-c] [1,2,5]thiadiazole-4,9-diones
The syntheses of a number of heterosubstituted ametantrone analogues, 5,8-bis[(aminoalkyl)amino]naphtho[2,3-d]thia- zole-4,9-diones and 5,8-bis[(aminoalkyl)amino]naphtho[2,3-c] [1,2,5]thiadiazole-4,9-diones, have been performed. It was evidenced that this modification in the chromophore moiety has a negative effect on antileukemic activity. This modification also favors the affinity of the compounds toward NADH dehydrogenase and influences the redox potential.