Olefin hydroformylation processes using hydrocarbon solvents and fluorinated solvents in the presence of phospholane-phosphite ligands

A process for preparing at least one aldehyde under hydroformylation temperature and pressure conditions, comprising contacting at least one olefin with hydrogen and carbon monoxide in the presence of at least one hydrocarbon solvent or fluorinated solvent and a transition metal-based catalyst composition comprising a phospholane-phosphite ligand having the general formula I:

• wherein:
• R1 and R2 are independently selected from H, or substituted and unsubstituted, aryl, alkyl, aryloxy or cycloalkyl groups containing from 1 to 40 carbon atoms;
• R3, R4 and R5 are independently selected from H, F, Cl, Br, or substituted and unsubstituted, aryl, alkyl, alkoxy, trialkylsilyl, triarylsilyl, aryldialkylsilyl, diarylalkylsilyl and cycloalkyl groups containing from 1 to 20 carbon atoms, wherein the silicon atom of the alkylsilyl is in the alpha position of the substituent;
• and
• R6 and R7 are independently selected from H, F, Cl, Br, alkyl groups containing from 1 to 10 carbon atoms, halogenated alkyl groups, or aryl groups containing from 1 to 20 carbon atoms.