Synthesis, structure and properties of pyrazole type tetrakis compounds

The interaction of organotin(IV) acceptors with a benzoic acid containing two pyrazolone groups †

“…The preparation of H 2 QBz presented here seems to be much more convenient with respect to that reported for the substituted bis(1-phenyl-3-methyl-5-hydroxypyrazol-4-yl)arylmethanes by the condensation of 1-phenyl-3-methylpyrazol-5-one with aryl dialdehydes. 15 The reaction between pyrazolone and isophthaloyl-or terephthaloyl-chloride under the same conditions, according to the general procedure, 13 results in the formation of the 1,3-16 and 1,4-bis[4-(1-phenyl-3-methylpyrazol-5-one)carbonyl]benzene 17 respectively. Even if pyridine or a proton-sponge were employed instead of calcium hydroxide, as used in the method of Jensen, 13 H 2 QBz was the only reaction product.…”

Chemistry of 4,4′‐(arylmethylene)‐bis(3‐methyl‐1‐phenyl‐1H‐pyrazol‐5‐ol)s

“…A series tetrakis compound 39 and 40 has been synthesized by reaction of dialdehydes 37 or 38 and pyrazolones 36 in CHCl 3 or ethanol (Scheme ).…”

“…Bispyrazole ( 81 ) has been synthesized via reaction of 4‐(diethoxymethyl)‐benzaldehyde 80 and pyrazolones 27 in AcOH/AcONa (Scheme ).…”

Sulfuric Acid ([3-(3-Silicapropyl)sulfanyl]propyl)ester as a Recyclable Catalyst for the Synthesis of 4,4′-(Arylmethylene)bis(1H-pyrazol-5-ols)

“…Melting points were determined using a Melting Point SMP1 apparatus in open capillary tubes and are uncorrected. All the products were characterized by comparing their spectral (IR, 1 H NMR), TLC, and physical data with those reported in the literature [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”