The Experts below are selected from a list of 2040 Experts worldwide ranked by ideXlab platform
Xingrong Zeng - One of the best experts on this subject based on the ideXlab platform.
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two step synthesis and characterization of urea Isobutyraldehyde formaldehyde resins
Progress in Organic Coatings, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Abstract Urea–Isobutyraldehyde–formaldehyde (UIF) resins were synthesized from urea, Isobutyraldehyde and formaldehyde using sulfuric acid as catalyst by two-step method. The effect of molar ratio of Isobutyraldehyde to formaldehyde ( n (I)/ n (F)), molar ratio of aldehyde to urea ( n (A)/ n (U)), catalyst concentration and reaction time on the yield, hydroxyl value and softening point of UIF resins were investigated. The UIF resins were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H-nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC) and thermogravimetric (TG). The results showed that the yield, hydroxyl value and softening point of the UIF resin were 76.5%, 90 °C and 32 mgKOH/g, respectively, when the molar ratio of urea to Isobutyraldehyde to formaldehyde ( n (U)/ n (I)/ n (F)) was 1.0/3.6/2.4, catalyst concentration was 6.0%, and reaction time in the second step reaction was 3.0 h. FT-IR and 1 H NMR results showed that α-H in Isobutyraldehyde participated in the synthesis reaction of UIF resins, and the reaction was Mannich reaction. The amount of aldehyde groups in UIF resins increased with the increase of the amount of Isobutyraldehyde. GPC results showed that the UIF resins had narrow molecular weight distribution and TG results indicated that the UIF resin had excellent heat resistance.
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synthesis and structural characterization of urea Isobutyraldehyde formaldehyde resins
Journal of Coatings Technology and Research, 2009Co-Authors: Yi-fu Zhang, Xingrong Zeng, Bi-ye RenAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
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One-pot synthesis and structural characterization of urea-Isobutyraldehyde-formaldehyde resin
Journal of Central South University of Technology, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
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Two-step synthesis and characterization of urea–Isobutyraldehyde–formaldehyde resins
Progress in Organic Coatings, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Abstract Urea–Isobutyraldehyde–formaldehyde (UIF) resins were synthesized from urea, Isobutyraldehyde and formaldehyde using sulfuric acid as catalyst by two-step method. The effect of molar ratio of Isobutyraldehyde to formaldehyde ( n (I)/ n (F)), molar ratio of aldehyde to urea ( n (A)/ n (U)), catalyst concentration and reaction time on the yield, hydroxyl value and softening point of UIF resins were investigated. The UIF resins were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H-nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC) and thermogravimetric (TG). The results showed that the yield, hydroxyl value and softening point of the UIF resin were 76.5%, 90 °C and 32 mgKOH/g, respectively, when the molar ratio of urea to Isobutyraldehyde to formaldehyde ( n (U)/ n (I)/ n (F)) was 1.0/3.6/2.4, catalyst concentration was 6.0%, and reaction time in the second step reaction was 3.0 h. FT-IR and 1 H NMR results showed that α-H in Isobutyraldehyde participated in the synthesis reaction of UIF resins, and the reaction was Mannich reaction. The amount of aldehyde groups in UIF resins increased with the increase of the amount of Isobutyraldehyde. GPC results showed that the UIF resins had narrow molecular weight distribution and TG results indicated that the UIF resin had excellent heat resistance.
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Synthesis and structural characterization of urea–Isobutyraldehyde–formaldehyde resins
Journal of Coatings Technology and Research, 2008Co-Authors: Yi-fu Zhang, Xingrong Zeng, Bi-ye RenAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
Yi-fu Zhang - One of the best experts on this subject based on the ideXlab platform.
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two step synthesis and characterization of urea Isobutyraldehyde formaldehyde resins
Progress in Organic Coatings, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Abstract Urea–Isobutyraldehyde–formaldehyde (UIF) resins were synthesized from urea, Isobutyraldehyde and formaldehyde using sulfuric acid as catalyst by two-step method. The effect of molar ratio of Isobutyraldehyde to formaldehyde ( n (I)/ n (F)), molar ratio of aldehyde to urea ( n (A)/ n (U)), catalyst concentration and reaction time on the yield, hydroxyl value and softening point of UIF resins were investigated. The UIF resins were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H-nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC) and thermogravimetric (TG). The results showed that the yield, hydroxyl value and softening point of the UIF resin were 76.5%, 90 °C and 32 mgKOH/g, respectively, when the molar ratio of urea to Isobutyraldehyde to formaldehyde ( n (U)/ n (I)/ n (F)) was 1.0/3.6/2.4, catalyst concentration was 6.0%, and reaction time in the second step reaction was 3.0 h. FT-IR and 1 H NMR results showed that α-H in Isobutyraldehyde participated in the synthesis reaction of UIF resins, and the reaction was Mannich reaction. The amount of aldehyde groups in UIF resins increased with the increase of the amount of Isobutyraldehyde. GPC results showed that the UIF resins had narrow molecular weight distribution and TG results indicated that the UIF resin had excellent heat resistance.
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synthesis and structural characterization of urea Isobutyraldehyde formaldehyde resins
Journal of Coatings Technology and Research, 2009Co-Authors: Yi-fu Zhang, Xingrong Zeng, Bi-ye RenAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
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One-pot synthesis and structural characterization of urea-Isobutyraldehyde-formaldehyde resin
Journal of Central South University of Technology, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
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Two-step synthesis and characterization of urea–Isobutyraldehyde–formaldehyde resins
Progress in Organic Coatings, 2009Co-Authors: Yi-fu Zhang, Xingrong ZengAbstract:Abstract Urea–Isobutyraldehyde–formaldehyde (UIF) resins were synthesized from urea, Isobutyraldehyde and formaldehyde using sulfuric acid as catalyst by two-step method. The effect of molar ratio of Isobutyraldehyde to formaldehyde ( n (I)/ n (F)), molar ratio of aldehyde to urea ( n (A)/ n (U)), catalyst concentration and reaction time on the yield, hydroxyl value and softening point of UIF resins were investigated. The UIF resins were characterized by Fourier transform infrared spectroscopy (FT-IR), 1 H-nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC) and thermogravimetric (TG). The results showed that the yield, hydroxyl value and softening point of the UIF resin were 76.5%, 90 °C and 32 mgKOH/g, respectively, when the molar ratio of urea to Isobutyraldehyde to formaldehyde ( n (U)/ n (I)/ n (F)) was 1.0/3.6/2.4, catalyst concentration was 6.0%, and reaction time in the second step reaction was 3.0 h. FT-IR and 1 H NMR results showed that α-H in Isobutyraldehyde participated in the synthesis reaction of UIF resins, and the reaction was Mannich reaction. The amount of aldehyde groups in UIF resins increased with the increase of the amount of Isobutyraldehyde. GPC results showed that the UIF resins had narrow molecular weight distribution and TG results indicated that the UIF resin had excellent heat resistance.
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Synthesis and structural characterization of urea–Isobutyraldehyde–formaldehyde resins
Journal of Coatings Technology and Research, 2008Co-Authors: Yi-fu Zhang, Xingrong Zeng, Bi-ye RenAbstract:Urea-Isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, Isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of Isobutyraldehyde to formaldehyde (n(I)/n(F)) and aldehyde to urea (n(A)/n(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to Isobutyraldehyde to formaldehyde (n(U)/n(I)/n(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 °C and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, Isobutyraldehyde, and formaldehyde.
B. Manohar - One of the best experts on this subject based on the ideXlab platform.
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SYNTHESIS OF Isobutyraldehyde FROM METHANOL AND ETHANOL OVER MIXED OXIDE SUPPORTED VANADIUM OXIDE CATALYSTS
Applied Catalysis A: General, 1993Co-Authors: B. Mahipal Reddy, E. Padmanabha Reddy, B. ManoharAbstract:Abstract A one step synthesis of Isobutyraldehyde from methanol and ethanol over mixed oxide (TiO2-Al2O3, TiO2-SiO2, TiO2-ZrO2 and TiO2-SiO2-ZrO2) supported vanadium oxide catalysts was investigated at atmospheric pressure and 350 °C. The V2O5/TiO2-SiO2 catalyst showed a better performance in terms of total conversion and product selectivity than the other catalyst systems.
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A single-step synthesis of Isobutyraldehyde from methanol and ethanol over CuO–ZnO–Al2O3 catalyst
J. Chem. Soc. Chem. Commun., 1992Co-Authors: B. Mahipal Reddy, E. Padmanabha Reddy, B. ManoharAbstract:Selective synthesis of Isobutyraldehyde from methanol and ethanol in a single step over CuO–ZnO–Al2O3 catalyst is reported.
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a single step synthesis of Isobutyraldehyde from methanol and ethanol over cuo zno al2o3 catalyst
Journal of The Chemical Society Chemical Communications, 1992Co-Authors: Mahipal B Reddy, Padmanabha E Reddy, B. ManoharAbstract:Selective synthesis of Isobutyraldehyde from methanol and ethanol in a single step over CuO–ZnO–Al2O3 catalyst is reported.
Yurii V Shklyaev - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of 1-Substituted 2-Azaspiro[4.5]deca-6,9-dien-8-ones and 2-Azaspiro[4.5]deca-1,6,9-trien-8-ones by Condensation of 2,6-Dimethylphenol with Isobutyraldehydes and Nitriles.
ChemInform, 2012Co-Authors: Yu. S. Rozhkova, Yurii V Shklyaev, K. A. Khmelevskaya, Marina A. Ezhikova, M. I. KodessAbstract:Three-component condensation of dimethylphenol (I) with Isobutyraldehyde (II) and nitriles (III) and (V) in concentrated sulfuric acid gives rise to formation of spiro compounds (IV) and (VI), respectively.
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Synthesis of 1-substituted 2-azaspiro[4.5]deca-6,9-dien-8-ones and 2-azaspiro[4.5]deca-1,6,9-trien-8-ones by condensation of 2,6-dimethylphenol with Isobutyraldehyde and nitriles
Russian Journal of Organic Chemistry, 2012Co-Authors: Yu. S. Rozhkova, Yurii V Shklyaev, K. A. Khmelevskaya, Marina A. Ezhikova, M. I. KodessAbstract:1-Substituted 3,3,7,9-tetramethyl-2-azaspiro[4.5]deca-6,9-dien-8-ones and 3,3,7,9-tetramethyl-2-azaspiro[4.5]deca-1,6,9-trien-8-ones were synthesized by three-component condensation of 2,6-dimethylphenol with Isobutyraldehyde and nitriles in concentrated sulfuric acid.
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Three-component condensation of o- and p-methoxytoluenes with Isobutyraldehyde and α-substituted benzyl cyanides. Synthetic approach to analogs of natural alkaloids
Russian Journal of Organic Chemistry, 2010Co-Authors: Yurii V Shklyaev, M. A. El’tsov, O. A. MaiorovaAbstract:Three-component condensation of o(p)-methoxytoluene with Isobutyraldehyde and α-substiituted benzyl cyanides gave 8-acetyl-3,6,6-trimethyl-5,6,7,12b-tetrahydrodibenzo[d,f]indol-2(1H)-one or 8-acetyl- 1,6,6-trimethyl-3,4,5,6,7,12b-hexahydrodibenzo[d,f]indol-3-one. Analogous reaction of p-methoxytoluene with Isobutyraldehyde and 1-phenylcyclopentane-1-carbonitrile afforded 1’,6’,6’-trimethyl-3’,4’,5’,6’,7’,12b’-hexahy- drospiro[cyclopentane-1’,8-dibenzo[d,f]indol]-3’-ones.
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Three-component condensation of methoxyarenes with Isobutyraldehyde and α-substituted benzyl cyanides
Russian Journal of Organic Chemistry, 2008Co-Authors: Yurii V Shklyaev, M. A. El’tsov, O. A. MaiorovaAbstract:Three-component condensation of anisole with Isobutyraldehyde and substituted benzyl cyanides gives 1-benzyl-3,3-dimethyl-2-azaspiro[4.5]deca-6,9-dien-8-ones which undergo dienone-phenol rearrangement during the reaction. Analogous condensation of 1-methoxynaphthalene leads to the formation of 2′-benzyl-5′,5′-dimethyl-4′,5′-dihydro-4 H -spiro[naphthalene-1,3′-pyrrol]-4-ones.
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A novel spiroheterocyclization: synthesis of 1-ethoxycarbonylmethylidene-8-(2’-ethoxycarbonylmethylidene-5’,5’-dimethyl-3’-pyrrolidinylidene)-3,3,6-trimethyl-2-azaspiro[4,5]deca-6,9-diene
Chemistry of Heterocyclic Compounds, 2004Co-Authors: Yurii V Shklyaev, Yu. V. Nifontov, M. I. Kodess, M. A. EzhikovaAbstract:It was shown that Isobutyraldehyde and cyanoacetic ester enter into reaction with meta-xylene initially at the fourth carbon atom with the formation of a spiropyrroline ring and then at the newly formed exomethylene bond with closure of the 1-ethoxycarbonylmethylidene-8-(2’-ethoxycarbonylmethylidene-5’,5’-dimethyl-3’-pyrrolidinylidene)-3,3,6-trimethyl-2-azaspiro[4,5]deca-6,9-diene system.
B. Mahipal Reddy - One of the best experts on this subject based on the ideXlab platform.
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Vapour phase synthesis of Isobutyraldehyde from methanol and ethanol over mixed oxide supported vanadium oxide catalysts
Research on Chemical Intermediates, 1997Co-Authors: B. Mahipal Reddy, E. Padmanabha Reddy, I. GaneshAbstract:The vapour phase synthesis of Isobutyraldehyde from methanol and ethanol in one step was investigated over titania-silica, titania-alumina, titania-zirconia, titania-silica-zirconia, and magnesia supported vanadium oxide catalysts at 623 K and under normal atmospheric pressure. Among various catalysts the titania-silica binary oxide supported vanadia provided higher yields than the other single or mixed oxide supported catalysts. The high conversion and product selectivity of V_2O_5/TiO_2-SiO_2 catalyst (20 wt% V_2O_5) was related to the better dispersion of vanadium oxide over titania-silica mixed oxide support in addition to other acid-base and redox characteristics. A reaction path for the formation of Isobutyraldehyde from methanol and ethanol mixtures over these catalysts was described.
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SYNTHESIS OF Isobutyraldehyde FROM METHANOL AND ETHANOL OVER MIXED OXIDE SUPPORTED VANADIUM OXIDE CATALYSTS
Applied Catalysis A: General, 1993Co-Authors: B. Mahipal Reddy, E. Padmanabha Reddy, B. ManoharAbstract:Abstract A one step synthesis of Isobutyraldehyde from methanol and ethanol over mixed oxide (TiO2-Al2O3, TiO2-SiO2, TiO2-ZrO2 and TiO2-SiO2-ZrO2) supported vanadium oxide catalysts was investigated at atmospheric pressure and 350 °C. The V2O5/TiO2-SiO2 catalyst showed a better performance in terms of total conversion and product selectivity than the other catalyst systems.
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A single-step synthesis of Isobutyraldehyde from methanol and ethanol over CuO–ZnO–Al2O3 catalyst
J. Chem. Soc. Chem. Commun., 1992Co-Authors: B. Mahipal Reddy, E. Padmanabha Reddy, B. ManoharAbstract:Selective synthesis of Isobutyraldehyde from methanol and ethanol in a single step over CuO–ZnO–Al2O3 catalyst is reported.
