2004
DOI: 10.1016/j.jfluchem.2003.11.011
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5(6)-Fluoro-6(5)-R-benzofuroxans: synthesis and NMR , and studies

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Cited by 26 publications
(15 citation statements)
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“…To understand better the influence of the position of the fluorine atom on the reactivity and electrophilicity of polyfluorobenzo‐furoxan and ‐furazan, the syntheses of known 5‐fluoro‐ ( 24 ),34 5,6‐difluoro‐ ( 25 ),35 and 4,5,6‐trifluoro‐benzofuroxan ( 26 )13 were performed. To complete this study, the syntheses of the new benzofurazan analogues 27 – 29 of the previous heterocycles were carried out (Scheme ).…”
Section: Discussionmentioning
confidence: 99%
“…To understand better the influence of the position of the fluorine atom on the reactivity and electrophilicity of polyfluorobenzo‐furoxan and ‐furazan, the syntheses of known 5‐fluoro‐ ( 24 ),34 5,6‐difluoro‐ ( 25 ),35 and 4,5,6‐trifluoro‐benzofuroxan ( 26 )13 were performed. To complete this study, the syntheses of the new benzofurazan analogues 27 – 29 of the previous heterocycles were carried out (Scheme ).…”
Section: Discussionmentioning
confidence: 99%
“…With the exception of the 13 C NMR of 6d, which was obtained on a Bruker 600 MHz instrument, all NMR spectra were recorded on a Varian Unity+300 instrument at ambient temperature. Chemical shifts for 19 F NMR were measured from hexafluorobenzene as internal standard and converted to the d-scale with CFCl 3 as reference by the conversion relation d(CFCl 3 ) = d(C 6 F 6 ) À 162.9 ppm [23]; spectra exhibiting 19 F-19 F coupling were run with acquisition time = 1.0 s to improve resolution. GC-MS data were obtained on a Shimadzu GC-17A/QP-5000 instrument operating in EI mode (70 eV).…”
Section: Methodsmentioning
confidence: 99%
“…Fluorinated Benzofuroxanes. The factors affecting tautomeric equilibria as well as thermodynamic characteristics of both isomers have been determined (Scheme 4) [17,18]. The factors affecting tautomeric equilibria as well as thermodynamic characteristics of both isomers have been determined (Scheme 4) [17,18].…”
Section: Discussion Fluorinated Benzazolesmentioning
confidence: 99%