21  5,744,650  22  3-methoxy-1.3-cyclohexamethylene  tetrakis[3,6-bis(  1.1- 20  $^{dimethylethyl)-2-naphthalenyl]ester }$of  phosphorous  acid  having  the  formula:  2.5-bis(  1.1-dimethylethyl)- 1.4-phenylene  tetrakis[2.4-bis(  1.  1-dimethylethyl)phenyl]ester  of  phosphorous  acid  having  the  formula:  methylenedi-2,  1-phenylene  tetrakis  (2.4-bis(  1, 1- dimethylethyl)phenyl]ester  of  phosphorous  acid  having  the  formula:  [ l,  l’-biphenyl]-2,2’-diyl  tetrakis[2-(  1.1-dimethylethyl)-4- methoxyphenyl]ester  of  phosphorous  acid  having  the  formula:  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  0  45  Ligand  R  Ligand  Q  Ligand  p 