Tantalum and niobium catalysts or catalyst precursors
AssigneeMassachusetts Institute of Technology
InventorRichard R. Schrock
Life of this patent
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Abstract
Tantalum and niobium catalysts or catalyst precursors of the formula: ##STR1## wherein R is cyclopentadienyl, which can be substituted with methyl up to five positions, or neopentylidene, R.sup.1 is neopentyl or benzyl, n is 0 or 1, R.sup.2 is neopentylidene, benzylidene, tetramethylene, or 2,3-dimethyltetramethylene, A is halo or a moiety of the formula YR.sup.3 R.sup.4 R.sup.5 wherein Y is a group 5 element including N, P, As, Sb and Bi and R.sup.3, R.sup.4, R.sup.5 can be the same or different and are C.sub.1 -C.sub.4 alkyl, aralkyl such as naphthyl, neophyl, tolyl or xylyl, aryl such as benzyl or phenyl or bipyridyl and Z is tantalum or niobium. The compounds selectively dimerize 1-olefins to 1-butenes; m=1 or 2.
Claims12
A compound of the formula:
- ##STR30## wherein R is cyclopentadienyl, C.sub.5 H.sub.x Me.sub.5-x, wherein x is an integer from 0 to 5, or neopentylidene, R.sup.1 is neopentyl or benzyl, n is 0 or 1, R.sup.2 is neopentylidene, benzylidene, tetramethylene or 2,3-dimethyltetramethylene, A is halo or a moiety of the formula YR.sup.3 R.sup.4 R.sup.5 wherein Y is a group 5 element and R.sup.3, R.sup.4 and R.sup.5 can be the same or different and are C.sub.1 -C.sub.4 alkyl, aralkyl, aryl or bipyridyl and Z is tantalum or niobium:
- m=1 or 2.
The compound of the formula:
- ##STR31##
The compound of the formula:
- ##STR32##
The compound of the formula:
- ##STR33##
The compound of the formula:
- ##STR34##
The compound of the formula:
- ##STR35##
The compound of the formula:
- ##STR36##
The compound of the formula:
- ##STR37##
The compound of the formula:
- ##STR38##
The compound of the formula:
- ##STR39##
Dependencies are inferred from the claim text.