(C9H19)C6H4CHO in toluene byproducts: CH2CCOOCH(C9H19)C(CH3)(C2H5); treatment of small excess (1.5 equiv.) of crude Et(Me)CCCO2C2H5(CH2B(OC(CH3)2)2) with (C9H19)CHO in toluene at room temp. for > 12 d;