Preparation of organosilicon compounds with aldehyde functionality

A process for preparing an aldehyde-functional organosilicon compound, said process comprising:

• 1) combining, under conditions to catalyze hydroformylation reaction, starting materials comprising:
• (A) a gas comprising hydrogen and carbon monoxide,
• (B) a vinyl-functional organosilicon compound having at least one vinyl group covalently bonded to silicon, and
• (C) a rhodium/ligand complex catalyst, where the ligand has formula (C1), (C2), and/or (C3):
• where:
• R1-R22 are each independently selected from hydrogen, a hydrocarbyl group, a heteroaryl group, a halogen atom, or a heterocarbyl group, wherein two or more of R1-R22 may optionally be bonded together to give one or more cyclic moieties;
• each of X1-X4 is independently selected from O, CH2, NH, NR, NSO2R or NSO2A, where each R is an independently selected substituted or unsubstituted alkyl or aryl group and each A is an independently selected aryl or heteroaryl group;
• and
• each of Y1-Y8 is an independently selected nitrogen-containing heterocyclic moiety bonded to P via N, wherein each heterocyclic moiety may be substituted with one or more groups or atoms selected from alkyl, aryl, heteroaryl, alkoxy, acyl, carboxyl, carboxylate, cyano, —SO3H, sulfonate, amino, trifluoromethyl, and halogen.