(Pyrazol-1-yl)carbonyl palladium complexes as catalysts for ethylene polymerization reaction
摘要:
Reactions of two equivalents of {3,5-(dimethylpyrazol-1-yl)-4-methoxy-1-carbonyl}benzene (L1), {3,5-(dimethylpyrazol-1-yl)-4-ethoxy-1-carbonyl}benzene (L2), {3,5-(dimethylpyrazol-1-yl)-4-hexyloxy-1-carbonyl}benzene (L3), and {3,5-(dimethylpyrazol-1-yl)-4-dodecycloxy-1-carbonyl}benzene (L4) with one equivalent of [Pd(NCMe)(2)Cl-2] produced the corresponding monometallic complexes, [Pd(L1)(2)Cl-2) (1), [Pd(L2)(2)Cl-2) (2), [Pd(L3)(2)Cl-2) (3) and [Pd(L4)(2)Cl-2) (4) in good yields. Solid state structures of 2 and 4 confirmed the monodentate character of L1-L4 and trans configuration of the palladium complexes. Activation of 1-4, and the furanyl and thiophenyl carbonyl pyrazolyl palladium complexes: [Pd((Me)pzCOfn)(2)Cl-2] (5), [Pd((Me)pzCOth)(2)Cl-2] (6), [Pd((tBu)pzCOfn)(2)Cl-2] (7) and [Pd((tBu)pzCOfn)(2)Cl-2] (8) (fn = furan, th = thiophene) with MAO produced catalysts for the polymerization of ethylene with moderate activities; forming linear high density polyethylene. The structure of the complexes had a significant effect on both the activity of the catalysts and nature of the polymers obtained. (C) 2012 Elsevier B. V. All rights reserved.
(Pyrazol-1-yl)carbonyl palladium complexes as catalysts for ethylene polymerization reaction
摘要:
Reactions of two equivalents of {3,5-(dimethylpyrazol-1-yl)-4-methoxy-1-carbonyl}benzene (L1), {3,5-(dimethylpyrazol-1-yl)-4-ethoxy-1-carbonyl}benzene (L2), {3,5-(dimethylpyrazol-1-yl)-4-hexyloxy-1-carbonyl}benzene (L3), and {3,5-(dimethylpyrazol-1-yl)-4-dodecycloxy-1-carbonyl}benzene (L4) with one equivalent of [Pd(NCMe)(2)Cl-2] produced the corresponding monometallic complexes, [Pd(L1)(2)Cl-2) (1), [Pd(L2)(2)Cl-2) (2), [Pd(L3)(2)Cl-2) (3) and [Pd(L4)(2)Cl-2) (4) in good yields. Solid state structures of 2 and 4 confirmed the monodentate character of L1-L4 and trans configuration of the palladium complexes. Activation of 1-4, and the furanyl and thiophenyl carbonyl pyrazolyl palladium complexes: [Pd((Me)pzCOfn)(2)Cl-2] (5), [Pd((Me)pzCOth)(2)Cl-2] (6), [Pd((tBu)pzCOfn)(2)Cl-2] (7) and [Pd((tBu)pzCOfn)(2)Cl-2] (8) (fn = furan, th = thiophene) with MAO produced catalysts for the polymerization of ethylene with moderate activities; forming linear high density polyethylene. The structure of the complexes had a significant effect on both the activity of the catalysts and nature of the polymers obtained. (C) 2012 Elsevier B. V. All rights reserved.
Iodonium salts as efficient iodine(<scp>iii</scp>)-based noncovalent organocatalysts for Knorr-type reactions
作者:Sevilya N. Yunusova、Alexander S. Novikov、Natalia S. Soldatova、Mikhail A. Vovk、Dmitrii S. Bolotin
DOI:10.1039/d0ra09640g
日期:——
Hypervalent iodine(III)-derivatives display higher catalytic activity than other aliphatic and aromatic iodine(I)– or bromine(I)-containing substrates for a Knorr-type reaction of N-acetyl hydrazides with acetyl acetone to give N-acyl pyrazoles. The highest activity was observed for dibenziodolium triflate, for which 10 mol% resulted in the generation of N-acyl pyrazole from acyl hydrazide and acetyl
对于N-乙酰酰肼与乙酰丙酮的克诺尔型反应生成N-酰基吡唑,高价碘 ( III ) 衍生物比其他脂肪族和芳香族含碘 () 或溴 () 的底物表现出更高的催化活性。三氟甲磺酸二苯并碘鎓的活性最高,10 mol% 会导致酰肼和乙酰丙酮在 50 °C 下反应 3.5-6 小时,生成N-酰基吡唑,分离收率高达 99%。 1 H NMR滴定数据和DFT计算表明碘( III )的催化活性是由与酮的结合引起的。