Olefin metathesis over tin-modified non-transition metal oxides

Buffon, Regina; Jannini, Marcelo J. D. M.; Abras, A.; Mol, J.C.; Wit, A. Marco de; Kellendonk, F.J.A.

doi:10.1016/s1381-1169(99)00190-9

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…26,27 Photometathesis over silica materials is a very unique system, because transition metals such as Mo, Re, and W have been generally believed to be essential active elements required for metathesis, 39 except for the rare cases over nontransition metal catalysts. [40][41][42][43][44] As reported previously, 37 the photometathesis over silica can be devided into two photoreaction steps. In the first step, the active site on the silica surface is excited by UV light, and subsequently, propene is adsorbed on the photoexcited active site to form one of metathesis intermediates.…”

Section: Introductionmentioning

confidence: 81%

Active Sites on Mesoporous and Amorphous Silica Materials and Their Photocatalytic Activity: An Investigation by FTIR, ESR, VUV−UV and Photoluminescence Spectroscopies

et al. 2002

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Active sites for photometathesis on mesoporous silica materials, FSM-16 and MCM-41, and amorphous silica, which are generated by dehydroxylation of surface isolated hydroxyl groups at high temperature above 673 K, were investigated by some spectroscopies such as FTIR, ESR, VUV−UV, and photoluminescence. FTIR study revealed that the catalytic active sites are the sites exhibiting the IR bands at 891 and 910 cm-1, which are known as a “strained siloxane bridge”. The catalytic active sites generated on three kinds of silica materials have uniform activity, and higher activity over FSM-16 than MCM-41 and amorphous silica is attributed to the larger amount of active sites generated. ESR study suggested that the IR bands would be assigned to the radical sites, ⋮Si−O· (NBOHC), which would be generated together with ·Si⋮ (E‘ center) by the dehydroxylation at high temperature, and the NBOHC photoexcited under UV light below ca. 390 nm would cause the photometathesis.

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Section: Introductionmentioning

confidence: 81%

Active Sites on Mesoporous and Amorphous Silica Materials and Their Photocatalytic Activity: An Investigation by FTIR, ESR, VUV−UV and Photoluminescence Spectroscopies

et al. 2002

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“…R. Buffon (IQ/Unicamp) surge na literatura como uma das primeiras pesquisadoras brasileiras a publicar trabalhos sobre este tipo de reação [27][28][29][30][31][32][33][34][35][36][37][38][39][40] . Em suas publicações, observam-se estudos com catalisadores de rênio e tungstênio.…”

Section: Metátese De Olefinas No Brasilunclassified

“…Faz-se uma abordagem sucinta sobre metátese de olefinas, mas não é de interesse apresentar um levantamento bibliográfico da literatura. Excelentes trabalhos de revisão têm sido publicados com este objetivo [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] , inclusive na língua portuguesa [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] . Assim, recomenda-se aos leitores que consultem a literatura e que fiquem atentos às novidades, dado o número crescente de trabalhos que vêm sendo divulgados.…”

Section: Introductionunclassified

Metátese de olefinas no Brasil: "Brazil is romping it!"

Matos¹,

Batista²,

Carvalho³

et al. 2007

Quím. Nova

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Metathesis – Homogeneous

Csihony

2002

Encyclopedia of Catalysis

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During the last decade olefin metathesis has become a progressive area of chemistry. Recently this type of CC bond‐forming method has been one of the most popular areas in organic, organometallic, and polymer chemistry, both in academic and in industrial research. This article tries to provide an insight into the structure, mode of action, and synthesis of the most effective catalysts including tungsten, molybdenum, and ruthenium. The discussion focused on the application of alkene and alkyne metathesis for synthesizing polymers, medium or large sized rings, and for reducing the reaction steps in complicated organic synthesis. On the other hand alkene metathesis can be used for cross‐metathesis, ring‐closing metathesis, ring‐opening metathesis, ring‐opening metathesis polymerization, and acyclic diene metathesis polymerization. Alkynes can also undergo metathesis reactions with alkenes or alkynes.

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Olefin metathesis over tin-modified non-transition metal oxides

Cited by 5 publications

References 18 publications

Active Sites on Mesoporous and Amorphous Silica Materials and Their Photocatalytic Activity: An Investigation by FTIR, ESR, VUV−UV and Photoluminescence Spectroscopies

Active Sites on Mesoporous and Amorphous Silica Materials and Their Photocatalytic Activity: An Investigation by FTIR, ESR, VUV−UV and Photoluminescence Spectroscopies

Metátese de olefinas no Brasil: "Brazil is romping it!"

Metathesis – Homogeneous

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