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Tantalum catalysts alkene metathesis

Alkoxide ligands play an important spectator role in the chemistry of metal-carbon multiple bonds. Schrock and coworkers have shown that niobium and tantalum alkylidene complexes are active toward the alkene metathesis reaction. One of the terminating steps involves a j8-hydrogen abstraction from either the intermediate metallacycle or the alkylidene ligand. In each case the -hydrogen elimination is followed by reductive elimination. The net effect is a [1,2] H-atom shift, as shown in equations (73) and (74), and a breakdown in the catalytic cycle. Replacing Cl by OR ligands suppresses these side reactions and improves the efficiency of the alkylidene catalysts. ... [Pg.1003]

Scheme 6.24 Alkene metathesis with a tantalum monohydride, bis-grafted catalyst, proposed as a key intermediate in alkane metathesis. Scheme 6.24 Alkene metathesis with a tantalum monohydride, bis-grafted catalyst, proposed as a key intermediate in alkane metathesis.

See other pages where Tantalum catalysts alkene metathesis is mentioned: [Pg.357]    [Pg.480]    [Pg.335]    [Pg.205]    [Pg.281]    [Pg.1572]    [Pg.1571]    [Pg.1]    [Pg.401]   
See also in sourсe #XX -- [ Pg.1118 ]

See also in sourсe #XX -- [ Pg.1118 ]

See also in sourсe #XX -- [ Pg.5 ]




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Metathesis catalysts

Tantalum catalyst

Tantalum metathesis catalyst

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