Patent ID: 7928267

Claim:
A catalyst solution comprising: (a) a phosphite compound; (b) a Group VIII metal or rhenium; and (c) a hydroformylation solvent, wherein said phosphite compound has the structure of formula (I): wherein R is an alkyl, cycloalkyl or aryl group which is substituted or unsubstituted and which contains 1 to 30 carbon atoms; Ar 1 and Ar 2 are each independently aryl groups which is substituted or unsubstituted and which contain 4 to 30 carbon atoms; R1 to R6 are each independently selected from H and substituted or unsubstituted alkyl, cycloalkyl, and aryl groups containing 1 to 40 carbon atoms; and X is (i) a chemical bond directly between ring carbon atoms of each aromatic group, (ii) a heteroatom, or (iii) a group having the formula wherein R15 and R16 are each independently selected from hydrogen and alkyl or aryl having one to 10 carbon atoms.