Cyclooctatetraene complexes of niobium and tantalum

Details Cyclooctatetraene complexes of niobium and tantalum Cyclooctatetraene complexes of niobium and tantalum

1974-06-13

1976-01-13

Sneed, Helen M. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260429R, C07F 900

Patent

active

039324770

ABSTRACT:
Reaction of tantalum or niobium pentachloride with dipotassium cyclooctatetraene(2-) yields K.sup.+M(C.sub.8 H.sub.8).sub.3 .sup.- and ClM(C.sub.8 H.sub.8).sub.2 (M is Ta or Nb). Likewise BrM(C.sub.8 H.sub.8).sub.2 can be prepared from MBr.sub.5. Reaction of (Cl, Br) M(C.sub.8 H.sub.8).sub.2 with a lithium alkyl or aryl gives RM(C.sub.8 H.sub.8).sub.2 where R is alkyl or aryl. The potassium ion of K.sup.+M(C.sub.8 H.sub.8).sub.3 .sup.- can be replaced with other alkali metal ions, alkaline earth metal ions, ammonium, phosphonium, or arsonium ions by metathesis. Likewise, (CH.sub.3).sub.3 TaCl.sub.2 and CH.sub.3 MCl.sub.4 react with dipotassium cyclooctatetraene(2-) to give (CH.sub.3).sub.3 Ta(C.sub.8 H.sub.8) and CH.sub.3 M(C.sub.8 H.sub.8).sub.2, respectively. The cyclooctatetraene complexes are catalysts for the oligomerization of ethylene and are useful as oxygen scavengers.

REFERENCES:
patent: 3450728 (1969-06-01), Wilke et al.
patent: 3622367 (1971-11-01), Haag
Coates, et al. Organometallic Compounds Vol. 1 p. 68 (1967).
Stone et al., Advances in Organometallic Chemistry Vol. 8 pp. 233, 269, 271 (1970).
Stone et al., Advances in Organometallic Chemistry Vol. 9, pp. 171 & 385 (1970).
Stone et al., Advances in Organometallic Chemistry Vol. 4, pp. 375 to 380 (1966).
Coates et al., Organometallic Compounds, Vol. 2, pp. 197 to 200 (1967).

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