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3-methoxy-1.3-cyclohexamethylene tetrakis[3,6-bis( 1.1- 20 $^{dimethylethyl)-2-naphthalenyl]ester }$of phosphorous acid having the formula: 

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2.5-bis( 1.1-dimethylethyl)- 1.4-phenylene tetrakis[2.4-bis( 1. 1-dimethylethyl)phenyl]ester of phosphorous acid having the formula: 

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methylenedi-2, 1-phenylene tetrakis (2.4-bis( 1, 1- dimethylethyl)phenyl]ester of phosphorous acid having the formula: 

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[ l, l’-biphenyl]-2,2’-diyl tetrakis[2-( 1.1-dimethylethyl)-4- methoxyphenyl]ester of phosphorous acid having the formula: 

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As noted above, the metal-organopolyphosphite ligand complex catalysts employable in this invention may be formed by methods known in the art. The metal› organopolyphosphite ligand complex catalysts may be in homogeneous or heterogeneous form. For instance, pre- formed rhodium hydrido-carbonyl-organopolyphosphite ligand catalysts may be prepared and introduced into the reaction mixture of a hydroformylation process. More preferably, the rhodium-organopolyphosphite ligand com- plex catalysts can be derived from a rhodium catalyst precursor which may be introduced into the reaction medium for in situ formation of the active catalyst. For example. rhodium catalyst precursors such as rhodium 

Ligand p 

Ligand R 

Ligand Q 

