| 摘要 |
1342049 5-Ethylidene-2-norbornenes MONTECATINI EDISON SPA 13 June 1972 [14 June 1971 (2)] 27679/72 Heading C5E [Also in Division B1] 5-Ethylidene-2-norbornenes are prepared by isomerizing 5-vinyl-2-norbornenes with a catalyst comprising (1) one or more titanium compounds of the formula Ti X 4-y (OR<SP>1</SP>) y where X is Cl, Br or I, R is C 1 -C 12 hydrocarbyl and y is 0 to 4, (2) an alkali metal, (3) an aluminium halide, and (4) a cyclopentadienyl thallium or sodium compound. The norbornene nucleus may contain a C 1 -C 4 alkyl substituent. The isomerization may be carried out at 25-300‹ C. in an inert aromatic or saturated aliphatic hydrocarbon diluent, e.g. mesitylene. Catalyst components used in the examples are (1) TiCl 4 , (2) Na, (3) AlCl 3 (4) cyclopentadienyl thallium or sodium cyclopentadiene. |
