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UDK: 547.542.535.771/772.8

2007. - V. 21. - N 6(74). - P. 81-85

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A novel, facile methodology for the synthesis of 4-(2 H -benzotriazol-2-yl)-3-methyl-1-phenyl-1 H -pyrazol-5-ol from 5-methyl-4-(2-nitrophenylazo)-2-phenyl-2,4-dihydro-3 H -pyrazol-3-on has been developed using rongalit and S,S-dioxide thiourea. The structure of 4-(2 H -benzotriazol-2-yl)-3-methyl-1-phenyl-1 H -pyrazol-5-ol was confirmed by NMR, LC/MS, UV, IR- and mass spectra.

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СИНТЕЗ ступенчатой восстановительной циклизацией 4-(2

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