The solvent method for synthesizing methyl hexyl acetaldehyde,under the anhydrous and alkali catalysis,methyl nonyl ketone and α - halogenated acid ester via Darzens reaction to generate α,β - epoxy acid ester,saponification, acidification,heating and decarboxylation. The optimum process conditions acquired:petroleum ether as solvent,reaction temperature for 10 ~ 15℃ for condensation,condensation rate of reached 75% ;25% NaOH solution for saponification;2% sulfuric acidhyl sulfoxide for decarboxylation,the methyl hexyl acetaldehyde must rate reached 61% .%溶剂法缩合制甲基己基乙醛，以甲基壬酮与α-卤代酸酯在无水碱催化下，通过 Darzens 反应生成α，β-环氧酸酯，经皂化、酸化、加热脱羧而得，并对该工艺进行优化，缩合反应以石油醚为溶剂，反应温度为10~15℃，缩合收率达到75％；水解反应：用25％的 NaOH 溶液；脱羧反应：用2％的硫酸，使甲基己基乙醛总收率达到61％。
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