Guanidines encapsulated in zeolite Y and anchored to MCM-41: synthesis and catalytic activity

Sercheli, Ricardo; Vargas, Rogério Matheus; Sheldon, Roger A.; Schuchardt, Ulf

doi:10.1016/s1381-1169(99)00054-0

Cited by 28 publications

(7 citation statements)

References 15 publications

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“…Sercheli et al [17] exhibited the use of alkylguanidines attached to modified polystyrene or siliceous MCM-41 in the methanolysis of soybean oil and interestingly, its activity was comparable to that of homogeneous catalysts. Kim and co-workers [18] experimentally described the use of Na/NaOH/␥-Al 2 O 3 in producing near-completion soybean oil methyl esters in 2 h. A tin complex [Sn(3-hydroxy-2-methyl-4-pyrone) 2 (H 2 O 2 )] has been successfully utilized in soybean oil methanolysis, giving a 93% yield in 3 h and with the added advantage of the possibility of recycling the catalyst [19].…”

Section: Heterogeneous Catalystmentioning

confidence: 99%

Performance of calcium oxide as a heterogeneous catalyst in biodiesel production: A review

Boey

Maniam

Hamid

2011

Chemical Engineering Journal

294

109

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Section: Heterogeneous Catalystmentioning

confidence: 99%

Performance of calcium oxide as a heterogeneous catalyst in biodiesel production: A review

Boey

Maniam

Hamid

2011

Chemical Engineering Journal

294

109

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“…27) and encapsulated in zeolite Y, and compared their performance as catalysts for the aldol reaction of benzaldehyde with acetone (125). The guanidine bases were anchored to the surface by reaction with grafted 3-glycidyloxypropyl moieties.…”

Section: Aldol Reactionmentioning

confidence: 99%

Preparation and use of hybrid organic–inorganic catalysts

2002

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“…7,8 The Michael reactions of nitroalkanes are usually carried out in the presence of a variety of different bases in homogeneous solutions of organic solvent or water. 9 Alternatively, heterogeneous catalysis 10,11 has been studied in order to take advantage of easy recovery of the catalyst and its reapplication in the chemical process, consequently minimizing the amount of waste products. Indeed, heterogeneous catalytic processes are one of the key goals for the development of clean synthetic methods.…”

Section: Introductionmentioning

confidence: 99%

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

Oliveira¹,

Torres²,

Silva³

et al. 2006

J. Braz. Chem. Soc.

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Um catalisador baseado em sílica quimicamente modificada com tetrametilguanidina (TMG) foi sintetizado pela co-condensação de tetraetilortossilicato (TEOS) com um novo agente sililante, preparado pela reação entre a molécula TMG e (3-cloropropil)trimetoxisilano. O direcionador n-dodecilamina foi utilizado para organizar a polimerização do catalisador inorgânico-orgânico. A termogravimetria mostrou que o número de sítios ativos do catalisador foi de 1,35 mmol g .A espectroscopia na região do infravermelho e de ressonância magnética nuclear no estado sólido para os núcleos 29 Si e 13 C confirmou a obtenção do produto desejado. Este material foi usado para catalisar a adição de nitrometano em ciclopentenona. 98% de conversão foi observada depois de 3 h de reação. O catalisador foi recuperado e reutilizado por mais catorze vezes, mantendo uma eficiência catalítica em torno de 98%.A catalyst based on silica chemically modified with tetramethylguanidine (TMG) was synthesized by the co-condensation of tetraethylorthosilicate (TEOS) with a new silylant agent derived from the reaction between the TMG molecule and (3-chloropropyl)trimethoxysilane. A neutral n-dodecylamine template was used to organize the polymerization of the inorganicorganic catalyst. Thermogravimetry showed that the number of active pendant groups in the catalyst was 1.35 mmol g -1 , with a surface area of 811 ± 75 m 2 g -1. Infrared spectroscopy and 13 C and 29 Si nuclear magnetic resonance data are in agreement with the proposed structure. This material has been used to catalyse the addition of nitromethane to cyclopentenone. The catalytic efficiency was followed and the nitromethylcyclopentanone conversion presented a yield of 98% at 3 h of reaction. The catalyst was recovered and reused 14 times, maintaining about 98% of its catalytic efficiency.

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Guanidines encapsulated in zeolite Y and anchored to MCM-41: synthesis and catalytic activity

Cited by 28 publications

References 15 publications

Performance of calcium oxide as a heterogeneous catalyst in biodiesel production: A review

Performance of calcium oxide as a heterogeneous catalyst in biodiesel production: A review

Preparation and use of hybrid organic–inorganic catalysts

Tetramethylguanidine covalently bonded onto silica gel as catalyst for the addition of nitromethane to cyclopentenone

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