CH3-CH2-OH-->CH3-COH-->CH3-COOH-->CH3-COOCH3
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CH3-CH2-OH -(Ni,t)-> CH3-COH + H2
CH3-COH + 2Cu(OH)2 -(t)-> Cu2O + CH3-COOH + 2H2O
CH3-COOH + CH3OH -(H2SO4)-> CH3-COO-CH3 + H2O