Highly active ruthenium complexes with bidentate phosphine ligands for the solvent-free catalytic synthesis of N,N-dimethylformamide and methyl formate
Abstract
Complexes of the type [RuCl
2
L
2
] [L =
Ph
2
P(CH
2
)
n
PPh
2
(n = 1–3),
Me
2
P(CH
2
)
2
PMe
2
] are shown to
be highly active and selective catalysts for the synthesis of formic acid
derivatives from carbon dioxide, hydrogen and dimethylamine or
methanol–triethylamine, respectively, without any additional
solvent, affording at 373 K with [RuCl
2
(dppe)
2
] an
extremely high turnover frequency (TOF) of 360000
h
-
1
in N,N-dimethylformamide
synthesis and a TOF of 830 h
-
1
in methyl
formate synthesis.
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