Isotopic hydrogen exchange in bisarenechromium complexes

Nucleophilic substitution reactions in fluorinated bis(arene)chromium complexes

“…The residue was sublimed at 60°( 2 mm) to yield red microcrystals of (7)-benzene)[r-6'-p-(2,3,4,5,6-pentafluoro-1,1 '-biphenyl) ] chromium (8) (18 mg, 0.048 mmol; 24%), mp 130°. The 1 NMR shows a narrow multiplet (6 H) at 4.58 and a multiplet (5 H) centered at 7.7. The 19F NMR shows three multiplets at 181.9 (2 F), 194.5 (2 F), and 196.6 (1 F) ppm to high field of CFCI3.…”

The reaction of arenetricarbonylchromium complexes with alkyllithium compounds

“…Catalytic isotopic hydrogen exchange has been observed for substituted benzenetricarbonylchromiiun (17), bis(arene)-chromium (18), bis(cyclopentadienyl)nickel (19) and a variety of (eyelopentadienyl)iron (20) complexes. Ring hydrogen…”

“…Cr(CO)3 " Cr(CO)3 exchange is observed even when the substituent is a methyl group (17,18). In an unusual example, proton abstraction from a cationic complex by n^-butyllithium has been observed Cr* +DBuLi > Cr* * Cr (21).…”

The reaction of arenetricarbonylchromium complexes with alkyllithium compounds

“…Catalytic isotopic hydrogen exchange has been observed for substituted benzenetricarbonylchromiiun (17), bis(arene)chromium (18), bis(cyclopentadienyl)nickel (19) and a variety of (eyelopentadienyl)iron (20) complexes. Ring hydrogen <Q)-R _EtONa__^-5^Q>-R Cr(CO)3 " Cr(CO)3…”

“…exchange is observed even when the substituent is a methyl group (17,18). In an unusual example, proton abstraction from a cationic complex by n^-butyllithium has been observed Cr* +DBuLi > Cr* * Cr (21).…”