Selective hydroformylation of 1-hexene to branched aldehydes using rhodium complex of modified bulky phosphine and phosphite ligands

The selective hydroformylation of 1-hexene to branched aldehydes was investigated using rhodium complex of tri-1-naphthylphosphine PNp3 and tri-1-naphthylphosphite P(ONp)3. The PNp3 and P(ONp)3 ligands having more steric nature than PPh3 enhanced the formation of branched aldehydes at 110°C and 4.0M...

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Bibliographic Details
Published in:Catalysis communications 2011-02, Vol.12 (6), p.403-407
Main Authors: Dabbawala, Aasif A., Jasra, Raksh V., Bajaj, Hari C.
Format: Article
Language:English
Subjects:
1-Hexene
Hydroformylation
Monodentate bulky phosphine
Phosphite
Selectivity to branched aldehydes
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Summary:The selective hydroformylation of 1-hexene to branched aldehydes was investigated using rhodium complex of tri-1-naphthylphosphine PNp3 and tri-1-naphthylphosphite P(ONp)3. The PNp3 and P(ONp)3 ligands having more steric nature than PPh3 enhanced the formation of branched aldehydes at 110°C and 4.0MPa syngas pressure. The branched aldehyde selectivity increased remarkably (82%) by adding P(ONp)3 as auxiliary ligand in Rh/PNp3 catalyzed hydroformylation of 1-hexene. The high selectivity for the branched aldehydes is due to rapid alkene isomerization producing internal alkenes followed by hydroformylation to yield branched aldehydes. [Display omitted] ► Selective hydroformylation of 1-hexene to branched aldehydes. ► Use of bulky phosphine/phosphite ligands for selective hydroformylation. ► Combination of bulky PNp3 and P(ONp)3 ligands to improve the selectivity of branched aldehydes.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2010.10.026