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Cationic Nickel Complexes with Weakly Coordinating Counterions and Their Application in the Asymmetric Cycloisomerisation of 1,6-Dienes by Christian Böing; Giancarlo Franciò; Walter Leitner is a Chemistry article available to read on EtoBox.
What is Cationic Nickel Complexes with Weakly Coordinating Counterions and Their Application in the Asymmetric Cycloisomerisation of 1,6-Dienes about?
## Abstract The influence of the counterion on cationic nickel catalysts for asymmetric cycloisomerisation of diethyl diallylmalonate (1a) and __N__,__N__‐diallyltosylamide (1b) is investigated. The activity of the catalysts formed from [Ni(η^3^‐allyl)(η^4^‐cod)]^+^ salts of weakly coordinating anions in combination with Wilke's azaphospholene ligand decreases in the order [Al{OC(CF~3~)~3~}~4~]^−^>[B{3,5‐(CF~3~)~2~‐C~6~H~3~}~4~]^−^>[Al{OC(CF~3~)~2~Ph}~4~]^−^ for 1a and [B{3,5‐(CF~3~)~2~‐C~6~H~3~}~4~]^−^> [Al{OC(CF~3~)~2~Ph}~4~]^−^>[Al{OC(CF~3~)~3~}~4~]^−^ for 1b, respectively. No significant influence on the enantioselectivity is observed for 1a whereas a marked increase in ee parallel to a decreasing activity is found for the cyclisation of 1b.
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- Author
- Christian Böing; Giancarlo Franciò; Walter Leitner
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 1615-4150)
- Published
- 2005
- Language
- EN
- Field
- Chemistry (Physical Sciences)