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|Title: ||1,2-bis-(ditertbutylphosphinomethyl)benzene in catalysis|
|Authors: ||Jiménez, Cristina|
|Supervisors: ||Eastham, Graham|
|Issue Date: ||2004|
|Abstract: ||Different diphosphine ligands having the structure shown below have been
studied for carbonylation and hydroformylation reactions.
Depending on the substituent on the phosphorus atoms the electronic and steric properties can be tuned to direct the reaction towards the desired products.
Palladium methoxycarbonylation of a large variety of unsaturated compounds
has been attempted under very different conditions. The outcome of these
reactions was the achievement of the linear products with a selectivity higher
than 99.5 % under mild conditions of pressure and temperature.
Chloroaromatic compounds have also been employed as substrates in
methoxycarbonylation reactions. Unexpected results were observed since
carbonylation was possible only when a strong electron withdrawing group was
present. The origin of the many side products from these reactions has been
Rhodium hydroformylation was not as successful as palladium
Methoxycarbonylation since relatively severe conditions had to be used to get
good rates and good selectivity. In no case were there as good as those obtained
in the carbonylation reactions. However, unusual factors, such as the presence of
chlorine in the reaction media, have been found to influence either the
conversion or the selectivity.|
|Publisher: ||University of St Andrews|
|Appears in Collections:||Chemistry Theses|
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