1. Hydroformylation, also known as the Oxo reaction, is a very important industrial process and has been practiced for many years. Initially cobalt catalysts were employed but these are limited in a number of ways including low regioselectivity for the more economically important linear product. Rhodium based processes have been developed that give much greater linear to branched product ratios and for which hydrogenation (of the aldehyde products) is not a significant side reaction.
a) Locate the following for [Rh(PPh3)3(H)(CO)]
i. infrared frequencies for CO and Rh-H stretches
1921 and 694 cm-1
ii. 1H (hydride resonance only), 31P and 13C (carbonyl resonance only) chemical and
coupling constant information (JRhH, JPH, hhc, Jpc); indicate the solvent, reference and field strength of the measurements.
Tabulation of data and reference to paper(s) reporting these data required.
Sudheesh, N.; Sharma, S.K.; Shukla, R. S..; Jasra, R.V. J. Mol. Catal. A: Chem.. 2008, 296, 61-70.
Evans, D,; Yagupsky, G.; Wilkinson, G. J. Chem. Soc. A, 1968, 0, 2660-2665.
b) Who obtained the first patent in which Rh(PPh3)3(CO)H is explicitly mentioned as a catalyst or catalyst precursor?
Geoffrey Wilkinson
c) What is the patent number, date of issue and the company to which the patent was assigned?