468083-33-2Relevant academic research and scientific papers
New synthetic routes to cationic rhenium tricarbonyl bipyridine complexes with labile ligands
Hevia, Eva,Perez, Julio,Riera, Victor,Miguel, Daniel,Kassel, Scott,Rheingold, Arnold
, p. 4673 - 4679 (2008/10/08)
Triflate abstraction from the complex [Re(OTf)(CO)3(bipy)] (1) using the salt NaBAr′4 (Ar′ = 3,5-bis(trifluoromethyl)phenyl) in dichloromethane solution in the presence of L = PPh3, NCMe, NCPh, imines, ketones, Et2O, THF, MeOH, and Mel affords cationic complexes [Re(L)(CO)3(bipy)]+ as their BAr′4-salts. The new complexes have been characterized spectroscopically and, for [Re(η1-O=C(Me)R)(CO)3(bipy)]BAr′4 (R = CH3, 6a; R = Ph, 6b), and [Re(THF)(CO)3(bipy)] BAr′4 (9), also by single-crystal X-ray diffraction. Compared with conventional methodologies, the route reported here allows the coordination of a broader range of weakly coordinating ligands and requires considerably milder conditions. On the other hand, the reactions of lithium acetylides with [Re(THF)(CO)3(bipy)]BAr′4 (9) can be used for the high-yield syntheses of rhenium alkynyls [Re(C≡CR)(CO)3(bipy)] (R = Ph, 12; R = SiMe3, 13). Complex 9 was found to catalyze the aziridination of benzylideneaniline with ethyl diazoacetate.
