Patent ID: 7586010

Claim:
A catalyst solution comprising: i. one or more phosphonite ligands having the general formula (I): wherein: R 1 is a phenyl group; R 2 , and R 3 are independently selected from ethyl, isopropyl, and phenyl group; R 4 and R 5 are independently selected from hydrogen and methyl group; R 1 , R 2 , and R 3 together have a steric bulk, A TOT , of about 6.2 to about 11.5 kcal/mol as calculated by the following formula: A TOT =A 1 +A 2 +A 3 wherein A 1 , A 2 , and A 3 are the A values for R 1 , R 2 , and R 3 , respectively; and X is optionally present as a methylene group; ii. rhodium; and iii. a hydroformylation solvent.