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Supstituisane karboksilne kiseline

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Halogenovanje alifatičnih kiselina.Hell-Volhard-Zelinsky reakcijaCH 3COOHCl 2, PClCH 2COOHCl 2, PClCHCOOHCl 2, PClClCCOOHClClBrCH 3CH 2COOHBr 2, PCH 3CHCOOHBr 2, PCH 3CCOOHBrBrBr 2, Pnema reakcijeAdicija halogenovodoničnih k. naα,β-nezasićene k.RCH=CHCOOHHXRCHCH 2COOHX 2=Cl 2, Br 2XOvo je zapravo 1,4–adicija nukleofilnog reagensa H–Bna α,β-nezasićeni karbonilni sistem:βCαCOC+OHδ+1,4-adicija βH B Cδ _Čini se da je došlodo 1,2-adicije NuHna dvostruku vezu C-C!!!BαCenol-oblikOCHOHizomerizacijaβCBαCHCOOH4

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