623-73-4
重氮乙酸乙酯
+
503-17-3
2-丁炔
→
~2%
56787-63-4
4-ethoxy-2,3-dimethylcyclobut-2-en-1-one
5783-75-5
ethyl 2,3-dimethylcycloprop-2-ene-1-carboxylate
66481-30-9
2-Ethoxy-4,5-dimethyl-furan
141-05-9
马来酸二乙酯