Abstract - InPROMPT

Einstein Workshop 2016
Sustainable Molecular Catalysis
7/8 November 2016 Berlin, Magnus-Haus
Compartmentalization of Homogeneous Catalysts using
Polyhedral Oligomeric Silsesquioxanes (POSS) and
Application in Continuous Processes
Viktor Söderholm
School of Chemistry, The University of Edinburgh, Joseph Black Building
David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
The inherent difficulty of separating (the expensive?) homogeneous catalysts from a
reaction mixture has been addressed with various approaches. So far only a very few
cases can be recognised as truly successful from a commercial application point of
view.[1] One approach is to immobilize the ligands on a suitable support material; we
have focused on using Polyhedral Oligomeric Silsesquioxanes (POSS) (figure 1a) as a
soluble support for some selected ligands (figure 1b) and applied them in continuous
flow reactors fitted with nanofiltration membranes (figure 1c).[2]
Earlier results on applications in Rh-catalyzed alkene hydroformylation and recent
progress will be presented and discussed together with the general boundary
conditions for immobilization of homogeneous catalysts.[3,4,5]
1a
R
R
O
Si
O
Si
R
R
O
Si
O
O
Si
O
OH
OH
Si
R
OH
O
O Si
R
O
Si
R
1b
O
P
P
O
P
P
P
R = iBu, Ph, etc
1c
Figure 1: a) POSS-trisilanol – a molecular weight
enlargement (MWE) unit, b) ligands subjected to POSS
MWE, c) continuous flow reactor fitted with a
nanofiltration membrane unit.
References:
[1]
[2]
[3]
[4]
[5]
C. W. Kohlpaintner, R. W. Fischer and B. Cornils, Appl. Catal., A, 2001, 221, 219 - 225.
M. Janssen, J. Wilting, C. Muller and D. Vogt, Angew. Chem., Int. Ed., 2010, 49, 7738-7741
C. Müller, M.G. Nijkamp, D. Vogt, Eur. J. Inorg. Chem. 2005, 4011-4021.
M. Janssen, C. Müller, D. Vogt, Dalton Trans. 2010, 36, 8403-8411.
M. Janssen, C. Müller and D. Vogt, Green Chem., 2011, 13, 2247.

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