Low-pressure hydroformylation of diisobutene

A hydroformylation process for preparing 3,5,5-trimethylhexanal comprising reacting 2,4,4-tri-methylpent-2-ene with H.sub.2 and CO in a reaction zone in the presence of one or more free organ-ophosphite ligands of the general formula (1)

##STR00001##

wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently H, C.sub.1- to C.sub.9-alkyl or C.sub.1- to C.sub.9-alkoxy and R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are not H at the same time, and R.sup.6, R.sup.7, R.sup.8, R.sup.9 and R.sup.10 are each independently H, C.sub.1- to C.sub.9-alkyl or C.sub.1- to C.sub.9-alkoxy and R.sup.6, R.sup.7, R.sup.8, R.sup.9 and R.sup.10 are not H at the same time, and R.sup.11, R.sup.12, R.sup.13, R.sup.14 and R.sup.15 are each independently H, C.sub.1- to C.sub.9-alkyl or C.sub.1- to C.sub.9-alkoxy and R.sup.11, R.sup.12, R.sup.13, R.sup.14 and R.sup.15 are not H at the same time, and a homogeneous rhodium catalyst complexed with one or more organophosphite ligands of the general formula (I) at a pressure of 1 to 100 bar abs and a temperature of from 50 to 200° C.

Process for hydroformylation of olefins using Pt and bromine.

Pt-biphenyl-iodine complex and Pt-biphenyl-bromine complex, and the use thereof for catalysis of a hydroformylation reaction.

Process for hydroformylation of olefins using Pt and iodine.

Process for hydroformylation of olefins using Pt and iodine or bromine.

Pt-thixantphos-iodine complex and Pt-thixantphos-bromine complex, and the use thereof for catalysis of a hydroformylation reaction.

Process for hydroformylation of olefins using Pt and DPEphos.

Process for hydroformylation of olefins using Pt and thixantphos.

Provided are a tricyclodecane dimethanol composition which may be usefully applied to the preparation of a high heat resistant polyester by reducing the content of impurities, and a preparation method thereof.

A process for producing branched alcohols through isomerization, hydroformylation and hydrogenation.