Tantalum and niobium catalysts or catalyst precursors

Details Tantalum and niobium catalysts or catalyst precursors Tantalum and niobium catalysts or catalyst precursors

1979-01-02

1980-11-04

Sneed, Helen M. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260429CY, 260440, 260446, 260447, 546 3, 546 4, C07F 900

Patent

active

042319471

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.

REFERENCES:
patent: 3932477 (1976-01-01), Schrock
patent: 3933876 (1976-01-01), Tebbe
patent: 3988332 (1976-10-01), Schrock
patent: 3992472 (1976-11-01), Urry
patent: 4021429 (1977-05-01), Schrock

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