11  5,744,649  12  6,6’-[[3,3’-bis(  1,l-dimethylethyl)-5.5’-dimethoxy-[  1.1  ’› biphenyl]-2.2’  -diyl]bis(  oxy)]bis-dibenzo[  d,f]  [  1.3.2]  dioxaphosphepin  having  the  formula:  6,6’-[  [  4,4’  -bis(  1,  1-dimethylethyl)-[  1,1  ’-binaphthyl]-2,2’  - diyl  ]bis(  oxy)  ]bis-dtbenzo[  d,f]  [  1,3  .2  ]-dioxaphosphepin  hav› ing  the  formula:  More  specifically  illustrative  substituents  include  primary,  secondary  and  tertiary  alkyl  radicals  such  as  methyl.  ethyl.  n-propyl,  isopropyl,  butyl,  sec-butyl.  t-butyl,  neo-pentyl.  n-hexyl.  amyl,  sec-amyl,  t-amyl,  iso-octyl.  decyl,  octadecyl,  and  the  like;  aryl  radicals  such  as  phenyl.  naphthyl  and  the  like;  aralkyl  radicals  such  as  benzyl,  phenylethyl.  triphenylmethyl,  and  the  like;  alkacyl  radicals  such  as  tolyl.  xylyl,  and  the  like;  alicyclic  radicals  such  as  cyclopentyl,  cyclohexyl.  1-methylcyclohexyl.  cyclooctyl,  cyclohexylethyl,  and  the  like;  alkoxy  radicals  such  as  methoxy,  ethoxy,  propoxy,  t-butoxy,  --OCH$_{2}$ CH$_{2}$ OCH$_{3}$ ,  -O(CH$_{2}$ CH$_{2}$ hOCH$_{3}$ ,  -O(CH$_{2}$ CH$_{2}$ hOCH$_{3}$ ,  and  the  like;  aryloxy  radicals  such  as  phenoxy  and  the  like;  as  well  as  silyl  radicals  such  as  $_{-Si(CH$_{3}$}$h,  $_{-Si(OCH$_{3}$}$h,  -Si(C$_{3}$ H$_{7}$ h,  and  the  like;  amino  radicals  such  as  -NH$_{2}$ •  $_{-N(CH$_{3}$}$h,  -NHCH$_{3}$ ,  -NH(C$_{2}$ H$_{5}$ ).  and  the  like;  arylphosphine  radicals  such  as  -P(C$_{6}$ H$_{5}$ h,  and  the  like;  acyl  radicals  such  as  --C(O)CH$_{3}$ ,  --C(O)C$_{2}$ H$_{5}$ •  --C(O)  C$_{6}$H$_{5}$ ,  and  the  like;  carbonyloxy  radicals  such  as  --C(O)  OCH$_{3 }$ and  the  like;  oxycarbonyl  radicals  such  as  -O(CO)  C$_{6}$H$_{5}$ ,  and  the  like;  amido  radicals  such  as  --CONH$_{2}$ ,  $_{--CON(CH$_{3}$}$h,  -NHC(O)CH$_{3}$ •  and  the  like;  sulfonyl  radi- methyl(3,3’  -di-t-butyl-5  .5’  -dimethoxy-l,  l  ’-biphenyl-2,2’› diyl)phosphite  having  the  formula:  Ligand  B  Specific  illustrative  examples  of  such  organophosphite  ligands  include  the  following:  2-t-butyl-4-methoxyphenyl(3  3’  -di-t-butyl-5  .5’-dimethoxy› L  1  ’-biphenyl-2.2’  -diyl)phosphite  having  the  formula:  cals  such  as  -S(O)$_{2}$ C$_{2}$H$_{5 }$ and  the  like;  sulfinyl  radicals  such  as  -S(O)CH$_{3 }$ and  the  like;  sulfenyl  radicals  such  as  -SCH$_{3}$ ,  -SC$_{2}$ H$_{5}$ ,  -SC$_{6}$ H$_{5}$ •  and  the  like;  phosphonyl  radicals  such  as  -P(O)(C$_{6}$ H$_{5}$ h,  -P(O)(CH$_{3}$ h,  -P(O)(C$_{2 }$ H$_{5}$ h,  -P(O)(C$_{3}$ H1h,  -P(O)(C4H$_{9}$ ) 2 ,  -P(O)(C$_{6}$ H$_{13}$ )z,  -P(O)CHiC$_{6}$ H$_{5}$ ).  -P(O)(H)(C$_{6}$ H$_{5}$ ),  and  the  like.  Of  course  any  of the  R 1 •  R 2 •  R 6 ,  R 7 ,  R 8 ,  W, X.  Q  and  AI  radicals  of  such  organophosphites  of  Formulas  (I)  to  (XI)  above  may  be  substituted  if  desired,  with  any  suitable  substituent  containing  from  1 to  30  carbon  atoms  that  does  not  unduly  adversely  affect  the  desired  result  of the  process  of this  invention.  Substituents  that  may  be  on  said  radicals  in  addition  of  course  to  corresponding  hydrocarbon  radicals  such  as  alkyl,  aryl.  aralkyl.  alkaryl  and  cyclohexyl  substituents,  may  include  for  example  silyl  radicals  such  as  -Si(R 10 ) 3 ;  amino  radicals  such  as  -N(R $^{10}$h;  phosphine  radicals  such  as  -aryl-P(R  10 h;  acyl  radicals  such  as  --C(O)  R $^{10 }$acyloxy  radicals  such  as  -OC(O)R 10 ;  amido  radicals  such  as  --CON(R 10 h  and  -N(R $^{1}$°)COR 10 ;  sulfonyl  radi› cals  such  as  -SO~ 10 ,  alkoxy  radicals  such  as  --OR 10 ;  sulfinyl  radicals  such  as  -SOR 10 ,  sulfenyl  radicals  such  as  -SR 10 ,  phosphonyl  radicals  such  as  -P(O)(R 10 ) 2 ,  as  well  as  halogen,  nitro.  cyano,  trifluoromethyl.  hydroxy  radicals,  and  the  like,  wherein  each  R $^{10 }$radical  individually  repre› sents  the  same  or  different  monovalent  hydrocarbon  radical  having  from  1 to  18  carbon  atoms  (e.g  ..  alkyl,  aryl.  aralkyL  alkacyl  and  cyclohexyl  radicals),  with  the  proviso  that  in  amino  substituents  such  as  -N(R  $^{1}$°) 2  each  R  10  taken  together  can  also  represent  a  divalent  bridging  group  that  forms  a  heterocyclic  radical  with  the  nitrogen  atom,  and  in  amido  substituents  such  as  --C(O)N(R 10 h  and  -N(R $^{1}$°)  COR $^{10 }$each  R $^{10 }$bonded  to  N  can  also  be  hydrogen.  Of  course  it is  to be  understood  that  any  of  the  substituted  or  unsubstituted  hydrocarbon  radicals  groups  that  make  up  a  particular  given  organophosphite  may  be  the  same  or  dif› ferent.  atoms  and  said  radicals  may  be  the  same  or  different,  while  the  preferred  alkylene  radicals  of  X  may  contain  from  2 to  18  carbon  atoms  and  the  preferred  alkylene  radicals  of  R 7  may  contain  from  5  to  18  carbon  atoms.  In  addition,  pref› erably  the  divalent  AI  radicals  and  divalent  aryl  radicals  of  X  of the  above  formulas  are  phenylene  radicals  in  which  the  bridging  group  represented  by  --{CH$_{2}$ ) $_{1}$--{Q)m--{CH$_{2}$ ) 1 - is  bonded  to  said  phenylene  radicals  in  positions  that  are  ortho  to the  oxygen  atoms  of  the  formulas  that  connect  the  phenylene  radicals  to  their  phosphorus  atom  of the  formulae.  It  is  also  preferred  that  any  substituent  radical  when  present  on  such  phenylene  radicals  be  bonded  in  the  para  and/or  ortho  position  of  the  phenylene  radicals  in  relation  to the  oxygen  atom  that  bonds  the  given  substituted  phenylene  radical  to its  phosphorus  atom.  Ligand  C  0  0  \/  p  0  0  ""I  p  I  \  0  0 