4.5 Article

Stoichiometric and Catalytic Reactivity of Ni(6-Mes)(PPh3)2

Journal

ORGANOMETALLICS
Volume 36, Issue 9, Pages 1776-1783

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.7b00129

Keywords

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Funding

  1. Royal Society
  2. EPSRC [EP/F029292/1]
  3. Engineering and Physical Sciences Research Council [EP/F029292/1] Funding Source: researchfish
  4. EPSRC [EP/F029292/1] Funding Source: UKRI

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The three-coordinate Ni(0) N-heterocyclic carbene complex Ni(6-Mes)(PPh3)(2) (1; 6-Mes = 1,3-bis(2,4,6-trimethylphen-yl)-3,4,5,6-tetrahydropyrimidin-2-ylidene) is formed in the reaction of Ni(cod)2 with a 1:2 mixture of 6-Mes and PPh3 or upon reduction of Ni(6-Mes)(PPh3)Br (2) with (KOBu)-Bu-t. Facile substitution of PPh3 in 1 gave a range of Ni(6-Mes)(PPh3)(L) products (L = PhGEECMe (3), PhCH=CH2 (4), Ph2CO (5), PhCHO (6)). Oxidative addition of C6F6 gave Ni(6-Mes)(PPh3)(C6F5)F (7), while 1 was also oxidized by 4-BrC6H4F to afford a mixture of 2 and Ni(6-Mes)(PPh3)(C6H4F)Br (8). Surprisingly, 1 was also oxidized upon reaction with the small 5-membered ring NHC IMe4 to give the terminal Ni(II) phosphido complex Ni(IMe4)(2)(PPh2)Ph (9). Compounds 1 and 5 proved to be active as a precursors for the catalytic transfer hydrogenation of ketones.

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