| 摘要 |
<p>1358611 Tris-(bicycloheptyl) chromium compounds HERCULES Inc 2 Feb 1972 [2 Feb 1971] 4934/72 Heading C2J [Also in Division C3] Organochromium compounds of general formula Y 3 CR where Y is where two of the R radicals are CH 3 and the other two are H and each R<SP>1</SP> is H or CH 3 , there being a total of 2 to 4 CH 3 groups attached to the bicyclic radical, are prepared by reacting the corresponding bridgehead lithium compound with a chromium salt (particularly a halide), an ether complex thereof or an alkoxide of chromium in an inert atmosphere at - 78 to + 35‹ C., usually in a hydrocarbon diluent such as pentane, heptane or cyclohexane. The chromium halide reactant may be CrCl 3 , CrCl 3 .3THF (tetrahydrofuranate), CrF 3 or CrI 3 . In the examples, tris-(4-camphyl) chromium is prepared (4-camphyl= 2,2,3-trimethyl-1-bicyclo-[2- 2,1]-heptyl). The compounds are useful as olefin polymerization catalysts.</p> |
