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Made available in DSpace on 2019-10-06T16:09:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-02-01 Amorphous SiO2-SO3H [1] with a small surface area and 1.32-mmol H+/g was used for the one-step preparation of solketal from glycerol and acetone; a 20%-w/w catalyst mixture (10% [1] and 10% (Bu4N)(BF4) was found to be very efficient for the synthesis of disolketal ether and of oxygenated biofuels fatty acids solketal esters (FASEs), by direct esterification of the caprylic, lauric, stearic, oleic and linoleic acids with solketal in a 4:1 acid:solketal ratio in refluxing toluene. Solketal acetate was also produced in quantitative yields. Department of Pharmacy Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, R. da Glória, 187, CEP-39 Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University-Unesp, R. Prof. Francisco Degni 55, Quitandinha, CEP-14 Department of Physics and Chemistry Faculdade de Ciências Farmacêuticas de Ribeirão Preto São Paulo University-USP, Av. do Café s/n, CEP-14 Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University-Unesp, R. Prof. Francisco Degni 55, Quitandinha, CEP-14

Made available in DSpace on 2021-06-25T10:50:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-12-01 SiO2-SO3H, with a surface area of 115 m2/g, pore volumes of 0.38 cm3g−1 and 1.32 mmol H+/g, was used as a 10% w/w catalyst for the preparation of 5-hydroxymethyl-2-furfural (HMF) from fructose. A conversion of 100% was achieved in a microwave reactor during 10 min at 150 °C in DMSO, with 100% selectivity for HMF, at a molar ratio of fructose: DMSO equal to 1:56. The catalyst could be re-used three times. Department of Pharmacy Universidade Federal dos Vales do Jequitinhonha e Mucuri-UFVJM, Campus JK, Rodovia MGT 367 - Km 583, nº 5.000, Alto da Jacuba Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University-Unesp, R. Prof. Francisco Degni 55, Quitandinha Department of Physics and Chemistry Faculdade de Ciências Farmacêuticas de Ribeirão Preto São Paulo University-USP, Av. do Café s/n Faculdade de Ciências Farmacêuticas Alimentos e Nutrição Universidade Federal do Mato Grosso do Sul - UFMS, Av. Costa e Silva, s.n. Centro universitário SENAI-CIMATEC, Av. Orlando Gomes, 1845, Piatã Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University-Unesp, R. Prof. Francisco Degni 55, Quitandinha

Made available in DSpace on 2018-12-11T17:18:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-03-01 Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) Two solvent free methods of a one-to-one alcohol/acid mol ratio synthesis of benzyl esters of the formic, acetic, benzoic, salicylic, nicotinic, and oxalic acids are described. The stoichiometric reactions used 1.5 mol ratio solid NbCl5 as the reagent and required from two to three hours for completion at room temperature; for the catalytic processes, NbCl5 was grafted directly, at room temperature, onto a silica gel of specific area of 507 m2g−1, produced from construction sand and sodium carbonate, forming a 5.4% Nb w/w SiO2-Nb gel with a specific area of 412 m2g−1. At 10% w/w catalyst/alcohol ratio, this SiO2-Nb catalyst gave similarly very good yields but required from 6 to 9 hours at the reflux temperature of the slurry. The catalyst could be re-used three times. Department of Pharmacy Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM Campus JK, Rodovia MGT 367 - Km 583, no 5000, Alto da Jacuba Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University - Unesp, R. Prof. Francisco Degni, no 55, Quitandinha Bioinorganic Chemistry Laboratory Department of Chemistry Faculdade de Filosofia Ciências e Letras de Ribeirão Preto e University of São Paulo, Av. Bandeirantes 3900 Department of Physics and Chemistry Faculdade de Ciências Farmacêuticas de Ribeirão Preto Universidade de São Paulo - USP, Av. Do Café s/n, 14040-903 Universidade de Franca, Av. Dr. Armando Salles Oliveira 201, C.P. 82 Universidade Estadual Paulista “Júlio de Mesquita Filho” - Unesp Instituto de Ciência e Tecnologia, Rodovia Presidente Dutra Km 138 Department of General and Inorganic Chemistry Institute of Chemistry São Paulo State University - Unesp, R. Prof. Francisco Degni, no 55, Quitandinha Universidade Estadual Paulista “Júlio de Mesquita Filho” - Unesp Instituto de Ciência e Tecnologia, Rodovia Presidente Dutra Km 138