反应详情

温度

-100 °C

A solution of 52.7 g of the above mixture of 2-(1H-inden-3-ylmethyl)pyridine and 2-[(E)-2,3-dihydro-1H-inden-1-ylidenemethyl]pyridine in a molar ratio of 10:9 in 550 ml of tetrahydrofuran was cooled to −100° C. 80.5 ml of a 15% strength n-butyllithium solution in hexane (0.1288 mol) were then slowly added dropwise. After the addition was complete, the reaction mixture was stirred at −100° C. for a further 45 minutes. The mixture was subsequently allowed to warm to room temperature. After stirring for a further 2 hours, the solution was cooled to −60° C. and 49 g (0.1288 mol) of chromium trichloride tris(tetrahydrofuran) were added while stirring. The mixture was allowed to warm slowly to room temperature and was subsequently stirred for a further 10 hours at room temperature. The reaction mixture was then refluxed for 20 minutes and subsequently cooled to room temperature. The solid which had precipitated was filtered off and washed with hot tetrahydrofuran. The solid was subsequently washed with diethyl ether and dried under reduced pressure. This gave 24.9 g of (1-(2-pyridylmethyl)indenyl)chromium dichloride (59%).

1. additionAfter the addition
2. temperatureto warm to room temperature
3. stirringAfter stirring for a further 2 hours
4. temperaturethe solution was cooled to −60° C.
5. stirringwhile stirring
6. temperatureto warm slowly to room temperature
7. stirringwas subsequently stirred for a further 10 hours at room temperature
8. temperatureThe reaction mixture was then refluxed for 20 minutes
9. temperaturesubsequently cooled to room temperature
10. customThe solid which had precipitated
11. filtrationwas filtered off
12. washwashed with hot tetrahydrofuran
13. washThe solid was subsequently washed with diethyl ether
14. customdried under reduced pressure