Toa Nenryo Kogyo Kabushiki Kaisha

Yoshio Ishii

Shozo Wada

Katsumi Kaneko

Nobukazu Okamoto

Tadamori Sakakibara

Yukio Nagashima

Yoshihisa Matsushima

In an oxo process wherein an olefin is caused to react with carbon monoxide and hydrogen, a rhodium catalyst is provided by carrying out the hydroformylation in the presence of a rhodium source and free mixed ligands comprising a tertiary organo phosphorus and tertiary organo arsenic in excess of the quantity required for coordination to the rhodium atom. For example, HRh(CO)(PPh.sub.3).sub.3 with excess AsPh.sub.3 /PPh.sub.3 may be used to give a high reaction rate and good selectivity to n-aldehyde.

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Nagoya, Japan

Yoshio Ishii