higher concentrations the following examples are intended to illustrate the invention without limiting it in any way 2 moles 272 46 g of 1 5 dimethyl 1 5 cyclooctadiene manufacturer shell gas chromatographic purity 75 were introduced into an autoclave together with 1 7 mmoles 1 175 g of a rhodium catalyst with the formula rh co ci pph 3 2 and 19 mmoles 5 g of triphenyl phosphine and reacted with a 1 1 mixture of hydrogen and carbon monoxide with intensive stirring for 5 hours at 100 u00b0 c under a pressure of 60 kg cm 2 and in the absence of solvent for working up the contents of the reactor were filtered and distilled through a 20 cm vigreux column subsequent fractionation was carried out in a spinning band column 82 g of monoaldehyde 3a boiling point 65 u00b0 c 16 mbar were obtained together with 35 4 g of dialdehyde boiling point 105 u00b0 c 16 mbar 2 moles 272 46 g of 1 5 dimethyl 1 5 cyclooctadiene manufacturer aldrich gas chromatographic purity 76 were introduced into an autoclave together with 1 7 mmoles 1 175 g of a rhodium catalyst with the formula rh co cl pph 3 2 and 19 mmoles 5 g of triphenyl phosphine and reacted with a 1 1 mixture of hydrogen and carbon monoxide with intensive stirring for 5 hours at 100 u00b0 c under a pressure of 60 kg cm 2 and in the absence of solvent for working up the contents of the reactor were filtered and distilled through a 20 cm vigreux column subsequent fractionation into educt and monoaldehyde was carried out in a spinning band column 132 g of product 3b were obtained boiling point 58 u00b0.