Armstrong, Westerman, Hattori, McLeland & Naughton
1, 2-bis(dialkylphosphino) benzene derivates having optical activites, process for producing same, and rhodium metal complexes containing same as ligands
 An optically active 1,2-bis(dialkylphosphino) benzene derivative represented by the general formula (1) which is suitable as a ligand for a transition metal catalyst in asymmetrical hydrogenation is provided. Also provided is a process for producing such a benzene derivative, and a rhodium metal complex having such a benzene derivative as a ligand which is useful as an asymmetric catalyst for use in asymmetrical hydrogenation. ##STR1## (where R.sup.1 denotes a straight or branched alkyl group having 2-6 carbon atoms, and each of the asterisks denotes an asymmetric phosphorus atom). 
Nippon Chemical Industrial Co., Ltd.
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C07B C07F C07F
inventional inventional inventional
Tomoya Tsuneo Hironari
Miura Imamoto Yamada