66644-67-5
ethyl 2-(2-methylphenyl)-2-oxoacetate
→
149922-98-5
2-(2-methylphenyl)-2-oxoacetyl chloride
79-37-8
草酰氯
+
557-91-5
1,1-二溴乙烷
95-46-5
邻溴甲苯