boric acid in benzene T=20°C; 0.5 h;

(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;

(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;

ToMMgMe T=24.84°C; 0.5 h;

in toluene moisture exclusion, stirring, heating from 60 to 120°C (10 min); concn. (vacuum), fractional distn., column rectification (vacuum); elem. anal.;

T=24.84°C; 0.166667 h;