30 carbon atoms or mixtures thereof such olefin mixtures are commercially readily available for example the olefin mixtures obtained as products of a process for the oligomerization of ethylene followed by a double bond isomerization and disproportionation reaction in the process of the invention these internal olefins usually mixtures of linear internal olefins with 2 to 100 carbon atoms per molecule or closer boiling fractions of such mixtures can be hydroformylated at high rates and almost complete conversion examples are mixtures of linear internal c 6 to c 8 olefins and of linear internal c 10 to c 14 olefins substituted olefins may also be used for example unsaturated carboxylic acids esters of such acids or unsaturated esters of carboxylic acids e g allyl acetate or the corresponding nitriles amides or halogenides thereof and the like if desired branched olefins such as propene trimer or isomeric butene dimers such as dimersol u2122 olefin may be used but the hydroformylation product will then of course contain branched structures as well also olefinically unsaturated polymeric feedstock such as atactic polyolefins like u201c shube 39 s mixture u201d a mixture of oligomers of c 16 olefins may be converted into interesting alcohols as intermediates to synthetic lubricants functionalized additives etc further alpha olefins such as 1 octene and propene and diolefins such as norbornadiene dicyclopentadiene 1 5 hexadiene and 1 7 octadiene may be used the diolefins will of course yield predominantly a di hydroformylated product although also mono hydroformylated products may be formed carbon monoxide and hydrogen may be supplied in equimolar or non equimolar ratios e g in a ratio within the range of about 5 1 to about 1 5 typically about 3.