CH3CHO \mathrm{CH}_{3} \mathrm{CHO}CH3CHO
CH3COOMgX \mathrm{CH}_{3} \mathrm{COOMgX}CH3COOMgX
CH3COOX \mathrm{CH}_{3} \mathrm{COOX}CH3COOX
(CH3COO)2Mg \mathrm{(CH}_{3} \mathrm{COO)_2Mg}(CH3COO)2Mg