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A dinuclear phosphite rhodium(I) complex obtained by syngas treatment of a Rh/hydroxy phosphonite olefin hydroformylation precatalyst
Author(s) -
Selent Detlef,
Spannenberg Anke,
Kubis Christoph,
Börner Armin
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619002730
Subject(s) - hydroformylation , rhodium , chemistry , olefin fiber , catalysis , medicinal chemistry , toluene , organic chemistry
A hydroxy phosphonite was found to be unstable during the catalyst preformation routine applied towards a rhodium olefin hydroformylation catalyst. C—P bond cleavage occurred when the phosphonite was reacted with [(acac)Rh(1,5‐COD)] (acac is acetyl acetate and 1,5‐COD is cycloocta‐1,5‐diene) at 80 °C and 20 bar of CO/H 2 . As a result, a nearly planar six‐membered ring structure consisting of two rhodium(I) cations and two bridging phosphorous acid diester anions was formed, namely bis[μ‐(4,8‐di‐ tert ‐butyl‐2,10‐dimethoxydibenzo[ d , f ][1,3,2]dioxaphosphepin‐6‐yl)oxy]‐1:2κ 2 P : O ;1:2κ 2 O : P ‐bis{[6‐([1,1′‐biphenyl]‐2‐yloxy)‐4,8‐di‐ tert ‐butyl‐2,10‐dimethoxydibenzo[ d , f ][1,3,2]dioxaphosphepine‐κ P ]carbonylrhodium(I)} toluene tetrasolvate, [Rh 2 (C 22 H 28 O 5 P) 2 (C 34 H 37 O 5 P) 2 (CO) 2 ]·4C 7 H 8 . Further coordination of phosphite and of carbonyl groups resulted in 16‐electron rhodium centres.