141-97-9
乙酰乙酸乙酯
+
1663-67-8
丙二酰氯
→
~63%
66533-46-8
ethyl 4-hydroxy-2-methyl-6-oxopyran-3-carboxylate
~40%
3385-34-0
4,6-二甲基-2-氧-2H-吡喃-5-甲酸乙酯