628323-90-0Relevant academic research and scientific papers
Divergent Isomerization Behavior and Rhodium(I) Coordination Chemistry of Indenyl Ligands Bearing either One or Two Pnictogen Donor Fragments
Cipot, Judy,Wechsler, Dominik,Stradiotto, Mark,McDonald, Robert,Ferguson, Michael J.
, p. 5185 - 5192 (2003)
1-(Diphenylphosphino)-2-(dimethylamino)indene (2c) has been prepared in 61% yield and upon exposure to Al2O3 is mostly isomerized to 3-(diphenylphosphino)-2-(dimethylamino)-indene (2d) (2c:2d ≈ 1:3); similarly, 1-(diisopropylphosphino)-2-(dimethylamino)indene (2a) is only partially converted to the corresponding C3 isomer (2b) upon treatment with Al2O3 (2a:2b ≈ 3:1). In contrast, 1-(diisopropylphosphino)indene (6a) has been prepared in 92% yield and is easily converted to 3-(diisopropylphosphino)indene (6b) on passing over Al 2O3; 0.5 equiv of [(η4-COD)RhCl] 2 and 6b combine to give [(K1-P-6b)(η 4-COD)RhCl] (7) in 79% yield. Treatment of either 2-(dimethylamino)indene (1) or 6b with a stoichiometric amount of n-BuLi, followed by the addition of 0.5 equiv of [(η 4-COD)RhCl] 2, produces the (η5-indenyl)-rhodium(I) complexes 8 (53% yield) and 9 (88% yield), respectively, in which the pnictogen donor is apparently not coordinated to the rhodium center. When 2.5 equiv of n-BuLi is combined with 6b and subsequently treated with 0.5 equiv of [(η 4-COD)RhCl]2, 9 is also produced, along with a small amount of the unusual Rh2Li2 species 10. The crystallographically determined structures of 2d, 3·C6H 6, 7, and 10·C7H8 are reported.
