Haloacetylated enol ethers: 12 [18]. Regiospecific synthesis and structural determination of stable 5-hydroxy-1H-pyrazolines

Abstract The regiospecific synthesis and structural elucidation by NMR spectroscopy, AM1 semiempirical MO calculations and X-ray diffraction of a novel series of twelve 3-aryl[alkyl]-5-hydroxy-5-trichloromethyl-4, 5-dihydro-1H-pyrazole-1-carboxyamides and analogous 1-thiocarboxy-amides, is reported.