| pubmed-article:15479095 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C0002065 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C0037098 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C0441655 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C1261322 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C1704241 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C1522508 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C0678594 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C0439237 | lld:lifeskim |
| pubmed-article:15479095 | lifeskim:mentions | umls-concept:C1527362 | lld:lifeskim |
| pubmed-article:15479095 | pubmed:issue | 41 | lld:pubmed |
| pubmed-article:15479095 | pubmed:dateCreated | 2004-10-13 | lld:pubmed |
| pubmed-article:15479095 | pubmed:abstractText | The reaction of [Ta(=CHtBu)(CH2tBu)3] or [Cp*Ta(CH3)4] with a silica partially dehydroxylated at 700 degrees C gives the corresponding monosiloxy surface complexes [([triple bond]SiO)Ta(=CHtBu)(CH2tBu)2] and [([triple bond]SiO)Ta(CH3)3Cp*] by eliminating a sigma-bonded ligand as the corresponding alkane (H-CH2tBu or H-CH3). EXAFS data show that an adjacent siloxane bridge of the surface plays the role of an extra surface ligand, which most likely stabilizes these complexes as in [([triple bond]SiO)Ta(=CHtBu)(CH2tBu)2([triple bond]SiOSi[triple bond])] (1a') and [([triple bond]SiO)Ta(CH3)3Cp*([triple bond]SiOSi[triple bond])] (2a'). In the case of [(SiO)Ta(=CHtBu)(CH2tBu)2([triple bond]SiOSi[triple bond])], the structure is further stabilized by an additional interaction: a C-H agostic bond as evidenced by the small J coupling constant for the carbenic C-H (JC-H = 80 Hz), which was measured by J-resolved 2D solid-state NMR spectroscopy. The product selectivity in propane metathesis in the presence of [([triple bond]SiO)Ta(=CHtBu)(CH2tBu)2([triple bond]SiOSi[triple bond])] (1a') as a catalyst precursor and the inactivity of the surface complex [([triple bond]SiO)Ta(CH3)3Cp*([triple bond]SiOSi[triple bond])] (2a') show that the active site is required to be highly electrophilic and probably involves a metallacyclobutane intermediate. | lld:pubmed |
| pubmed-article:15479095 | pubmed:language | eng | lld:pubmed |
| pubmed-article:15479095 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:15479095 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
| pubmed-article:15479095 | pubmed:month | Oct | lld:pubmed |
| pubmed-article:15479095 | pubmed:issn | 0002-7863 | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:EmsleyLyndonL | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:BassetJean-Ma... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:LesageAnneA | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:CopéretChrist... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:SunleyGlenn... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:ChabanasMathi... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:BaudouinAnneA | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:LukensWayneW | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:de... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:Thivolle-Caza... | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:Le RouxErwanE | lld:pubmed |
| pubmed-article:15479095 | pubmed:author | pubmed-author:QuadrelliE... | lld:pubmed |
| pubmed-article:15479095 | pubmed:issnType | Print | lld:pubmed |
| pubmed-article:15479095 | pubmed:day | 20 | lld:pubmed |
| pubmed-article:15479095 | pubmed:volume | 126 | lld:pubmed |
| pubmed-article:15479095 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:15479095 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:15479095 | pubmed:pagination | 13391-9 | lld:pubmed |
| pubmed-article:15479095 | pubmed:year | 2004 | lld:pubmed |
| pubmed-article:15479095 | pubmed:articleTitle | Detailed structural investigation of the grafting of [Ta(=CHtBu)(CH2tBu)3] and [Cp*TaMe4] on silica partially dehydroxylated at 700 degrees C and the activity of the grafted complexes toward alkane metathesis. | lld:pubmed |
| pubmed-article:15479095 | pubmed:affiliation | Laboratoire de Chimie Organométallique de Surface, UMR 9986 CNRS/ESCPE Lyon, Villeurbanne, France. | lld:pubmed |
| pubmed-article:15479095 | pubmed:publicationType | Journal Article | lld:pubmed |
| http://linkedlifedata.com/r... | pubmed:referesTo | pubmed-article:15479095 | lld:pubmed |
