Aqueous biphasic catalytic hydrogenation of olefins and olefin mixtures by the [Rh(μ-Pz)(CO)(TPPMS)]2 complex, Pz = pyrazolate, TPPMS = (C6H5)2P(C6H4SO3Na)

✍ Scribed by Pablo J. Baricelli; Tirza Ascanio; Eduardo Lujano; Luis G. Melean; Margarita Borusiak; Francisco López-Linares; Luis Jhonatan Bastidas; Merlín Rosales

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 258 KB
• Volume: 278
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2007.07.025

✦ Synopsis

The hydrosoluble complex [Rh(-Pz)(CO)(TPPMS)] 2 , Pz = pyrazolate ligand, and TPPMS = (C 6 H 5 ) 2 P(C 6 H 4 SO 3 Na) was used as catalytic precursor in the two phase hydrogenation reaction of the individual olefins (1-hexene, styrene, cyclohexene and 2,3-dimethyl-1-butene) to give the main expected saturated products. Under the best operational conditions (80 • C, 200 psi H 2 , S/C 535/1, and 600 rpm), the substrates showed the following hydrogenation reactivity order: 1-hexene > styrene > cyclohexene > 2,3-dimethyl-1-butene. The quaternary equimolar mixture of olefin and an olefin mixture that simulates a real composition of olefin present in a naphtha showed a different hydrogenation order; styrene > 1hexene > cyclohexene > 2,3-dimethyl-1-butene. The catalyst can be recycled without significant loss of activity and showed sulfur tolerance, demonstrated by using benzothiophene in the olefin mixtures.