For reviews, see: Elguero, J. Pyrazoles and their Benzo Derivatives, Pyrazoles, Pyrazolines, Pyrazolidines, Indazoles and Condensed Rings, vol.5, pp.167-303, 1984. ,
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, mp 94 °C. MS (CI-CH 4 ): m/z = 267 [M + H + ]. HRMS: m/z [M + NH 4, vol.3
, Hz, 1 H). 19 F NMR (188 MHz, acetone-d 6 ): d = -68.92 (s)
,
, Synthesis, p.735, 1993.
, Tetrahedron Lett, vol.33, p.165, 1992.
, Org. Synth. 1955, Coll, vol.III, p.2431, 1974.
, For 4: mp 114.2 °C. MS (EI): m/z = 117, p.127
CDCl 3 ): d = 8.25 (s, 1 H), 7.77, 7.73 (2 × dd, pp.3-7 ,
, 55 (br s, 1 H), 6.97 (dd, Hz, 4 J = 0.9 Hz, 2 H), vol.7
, Hz, 1 H). 13 C NMR (75 MHz
, During this addition the temperature was not allowed to rise above 25 °C. After the nitrite solution had been added, stirring was maintained for 20 min. Any yellow precipitate formed during this time was filtered and discarded. Then, the solution was evaporated in vacuo. Cold H 2 O was added to the residue and the contents of the flask were washed into a beaker where they were stirred. The product was filtered
, Dtsch. Chem. Ges, vol.37, p.2584, 1904.
In Palladium Reagents and Catalysts, New Perspectives for the 21 st Century ,
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, Bull. Soc. Chim. Fr, vol.6, issue.7, p.3401, 1966.
, Tetrahedron Lett, p.3271, 1998.
, For 10: mp 160.7 °C. MS (EI): m/z = 143
, Hz, 1 H). 13 C NMR (75 MHz
, ) For 12: mp 77.5 °C. MS (EI): m/z =142, vol.136, p.497, 1999.
CDCl 3 ): d = 10.70 (br s, 1 H), 8.15 (s, 1 H), 7.78, 7.56 (2 × d, J = 8.1 Hz, 2 H), 7.15 (t, J = 8.1 Hz, 1 H), 3.46 (s, 1 H). 13 C NMR (75 MHz, For 5: mp 160.9 °C. MS (EI): m/z = 323 ,
, CDCl 3 ): d = 10.10 (br s, 1 H), 7.81, 7.63 (2 × d, J = 8.0 Hz, 2 H), 7.03 (t, J = 8.0 Hz, 1 H). 13 C NMR (75 MHz
, For examples, p.63, 1990.
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