Alcohols production

A process, comprising the steps of:

• providing CO and H2;
• providing a first catalyst which is an organometallic complex of rhodium and one type of an organophosphorus ligand or an organometallic complex of rhodium and more than one type of an organophosphorus ligand;
• providing a linear alpha olefin;
• isomerizing said linear alpha olefin by said first catalyst in the presence of CO and H2 at a first pressure to produce an isomerized olefin;
• and
• hydroformylating said isomerized olefin by said first catalyst in the presence of CO and H2 at a second pressure higher than said first pressure to produce a branched aldehyde.