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US 3,988,332 AGranted
Hydrocarbylidene compounds of niobium and tantalum
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard Royce Schrock
Life of this patent
Estimating the term…
Abstract
Certain hydrocarbylidene compounds of niobium and tantalum react with oxo compounds to form olefins and are also useful as oxygen scavengers. The compounds can also be used to deposit tantalum or niobium mirrors by thermal decomposition. Exemplary is trineopentyl(neopentylidene)tantalum of the formula [(CH.sub.3).sub.3 CCH.sub.2 ].sub.3 Ta=CHC(CH.sub.3).sub.3.
Claims10
A compound having the formula ##EQU1## wherein Cp is .pi.-cyclopentadienyl having up to one alkyl substituent;
- L is P(R.sup.3).sub.3 or (R.sup.3).sub.2 PCH.sub.2 CH.sub.2 P(R.sup.3).sub.2 in which R.sup.3 is alkyl or aryl;
- Q is alkyl, aralkyl or diarylmethyl in which the .beta.-carbon is not bonded to hydrogen;
- M is niobium or tantalum;
- X is F, Cl, Br, I or alkyl, aralkyl or diarylmethyl in which the .beta.-carbon is not bonded to hydrogen;
- R.sup.1 and R.sup.2 individually are hydrogen, tertiary alkyl or aryl, only one of R.sup.1 and R.sup.2 being tertiary alkyl;
- alkyl has 1-10 carbons, aralkyl has 7-10 carbons and aryl, including the aryl groups in diarylmethyl, has 6-10 carbons;
- a, b and c individually are 0, 1 or 2;
- with the proviso that b is 1 when L is a diphosphine or 2 when L is a monophosphine;
- and
- with the further provisos that
- when a is 2, b and c are each 0;
- when a is 1, b is 1 or 2, c is 1, Q and X are each CH.sub.3 and R.sup.1 and R.sup.2 are each H;
- and
- when a is 0, b is 0, c is 2 and X is the same as Q.
11 more elements
Dependencies are inferred from the claim text.