[Ru((R)-2,2‘-bis(diphenylphosphino)-1,1‘-binaphthyl)(H)(MeCN)(THF)2](BF4), a Catalyst System for
Hydrosilylation of Ketones and for Isomerization,
Intramolecular Hydrosilylation, and Hydrogenation of
Olefins
posted on 1996-09-03, 00:00authored byJason A. Wiles, Christopher E. Lee, Robert McDonald, Steven H. Bergens
(R)-2,2‘-Bis(diphenylphosphino)-1,1‘-binaphthyl ((R)-BINAP) reacted with
cis-[Ru(MeCN)2(COD)(η3-C3H5)](BF4) (COD =
cycloocta-1,5-diene) to generate two
isomers of
[Ru(MeCN)((R)-BINAP)((1−3-η):(5,6-η)-C8H11)](BF4) (1) that reacted with an excess of
dihydrogen gas
(pressure H2 ∼1 atm, ambient temperature) in THF
and
methylene chloride (∼5:1) to generate
[Ru((R)-BINAP)(H)(MeCN)(THF)2](BF4)
(2). Reactions effected using 2
mol % 2 as catalyst include hydrogenation of
(Z)-methyl
α-acetamidocinnamate, hydrosilylation of ethyl acetoacetate by chlorodimethylsilane, tandem, stereoselective
isomerization of (rac)-3-buten-2-ol via a partial
kinetic
resolution (ee of 3-buten-2-ol 42% S at 50%
conversion)
to initially generate (Z)-2-buten-2-ol, followed by
isomerization of the enol to 2-butanone, and competing isomerization and intramolecular hydrosilylation of dimethyl(2-propen-1-oxy)silane.