Abstract
Olefin metathesis is the catalytic transformation of olefinic substrates, finding a wide range of applications in organic synthesis. The mesoporous molecular sieve Santa Barbara Amorphous (SBA-15) has proven to be an excellent support for metathesis catalysts thanks to its regular mesoporous structure, high BET area, and large pore volume. A survey of catalysts consisting of (i) molybdenum and tungsten oxides on SBA-15, and (ii) molybdenum and ruthenium organometallic complexes (Schrock and Grubbs-type carbenes) on SBA-15 is provided together with their characterization and catalytic performance in various metathesis reactions. The comparison with catalysts based on other supports demonstrates the high quality of the mesoporous molecular sieve SBA-15 as an advanced catalyst support.
Highlights
Olefin Metathesis and the Basic Properties of Santa Barbara Amorphous (SBA-15) 1
Well-defined olefin metathesis catalysts, i.e., Schrock and Grubbs-type carbenes were immobilized on various types of silica or silica-alumina supports ranging from high-surface microporous silica through mesoporous molecular sieves to micro- or mesoporous zeolites
SBA-15 is an excellent support for metathesis catalysts thanks to its thermal and chemical stability, well-defined structure, and large pores
Summary
Olefin Metathesis and the Basic Properties of Santa Barbara Amorphous (SBA-15) 1. Introduction: Olefin Metathesis and the Basic Properties of Santa Barbara Amorphous (SBA-15). 22ooff1280 of olefin metathesis and its applications have already been discussed in detail in several monographs o[f1–th4e]. Many important aspects of olefin metathesis and its applicOalteiofinnsmhaevtaethaelrseiasdcyatbaelyesntsdaisrceuesxsceldusinivdeelytabilaisnedseovnertahlemfoolnloowgrianpghtsra[n1–si4t]i.on metals: Ti, Ta, Mo, W, ROel,eafinndmReut,ahthoewsiesvceart,atlhyestismapreoretxacnlcuesiovfeTlyi banasdedTaonistvheerfyollliomwitiendg[t5r,a6n].siItnioandmdietitoanls,:cTair,bTean,eMs oof, Wth,eRsee,traanndsiRtiuo,nhmoweteavlsehr,atvheebiemepnosrhtoawncne toofaTcit aansdacTtaiviescvaetraylyltiimc sitpeedci[e5s,,6w]. Ookoshi available asnildicaO(nBarkuan[a1u4e]rs-tEumdmiedett1--ToecltleeRnrOe(BmEeTMt)aotahreesais61o9vemr 2M/go) Oor supported either on commercially on laboratory prepared hexagonal mesoporous silicas (HMS) (d100 spacing ≥3 nm, BET areas between 1230 and 1450 m2/g). Ookoshi and Onaka [14] studied 1-octene metathesis over MoO3 supported either on commercially available silica (Brunauer-Emmett-Teller (BET) area 619 m2/g) or on laboratory prepared hexagonal. Cathailygshtse2r01th9,a9n, 7t4h3at of MoO3 on conventional silica This enhanced activity was ascribed to better Mof 1o8O3 dispersion on supports with larger surface areas
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