(SiPh2)(t-C4H9)O(CH2)2CHO in neat (no solvent) byproducts: CH2CCOOCH(SiPh2(t-C4H9)OCH2CH2)C(CH3)(CH3); treatment of small excess (1.5 equiv.) of crude (Me)(Me)CCCO2C2H5(CH2B(OC(CH3)2)2) with (SiPh2(t-C4H9)OCH2CH2)CHO at 25°C. for > 12 d;