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By Alan Katritzky

The definitive serial within the box - considering the fact that 1960. * offers updated fabric on a quick growing to be and hugely topical topic quarter * comprises the most recent learn masking a large choice of heterocyclic themes * Written by way of prime experts and designed as a instruction manual for college kids and and educational researchers.

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By Alan Katritzky

The definitive serial within the box - considering the fact that 1960. * offers updated fabric on a quick growing to be and hugely topical topic quarter * comprises the most recent learn masking a large choice of heterocyclic themes * Written by way of prime experts and designed as a instruction manual for college kids and and educational researchers.

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XII. Elimination . . . . . . . . . . . . . . . . . . . . . . . . A. Deamination via Diazotization . . . . . . . . . . . . . . . . B. Deformylation . . . . . . . . . . . . . . . . . . . . . . C. Deprotection and Decarboxylation . . . . . . . . . . . . . . . D. By Ring Formation . . . . . . . . . . . . . . . . . . . . XIII. Michael-Type Additions . . . . . . . . . . . .

80 81 81 87 90 92 93 93 95 95 97 98 98 99 100 101 101 101 101 102 102 103 105 106 112 113 114 115 116 116 118 121 122 124 124 124 125 125 126 128 130 132 132 133 133 133 134 Sec. A] 29 PYRAZOL-3-ONES. PART III I. Introduction The present article is Part III of a three part series. In Part I (01AHC(80)73) the synthesis and applications of pyrazol-3-ones I and II are described. In Part II (04AHC(87)141) the reactions of the ring atoms of pyrazol-3-ones I and II are given.

VII NHSO2Me Ph MeSO2Cl N O N Me O N N Ph Ph (98) (99) Me Scheme 28 VI. Diazonium Salt Coupling 4-Diazopyrazol-3-one salts have been prepared in situ and kept for a short period at low temperature by either diazotization of 4-aminopyrazol-3-ones or by diazo group transfer onto 4-unsubstituted 2,4-dihydropyrazol-3-ones from 4-toluenesulfonylazide or aziridinium salts. Coupling these diazonium salts with carbon nucleophiles is the most common reaction (04AHC(87)141). A. DIAZOPYRAZOL-3-ONE COUPLING The mesomeric diazo compound 100a/100b, derived from diazo group transfer to the appropriate pyrazol-3-one, was irradiated for 10 h in tetrahydrofuran to give the hydrazone chelated adduct 101 as the only product (78H199) (Scheme 29).

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