Propionyl ferrocene reacted with 4-substituted semicarbazides converted into corresponding semicarbazones 1-8, which are not prepared previously.
丙酰基二茂铁和4-取代氨基脲反应制得8个相应的缩氨基脲1～8，它们均属首次制得。
2
The propionyl chloride was found to be the appropriate acylating agent in terms of the cost.
通过成本比较，认为丙酰氯是合适的酰化剂。
3
The stavudine was prepared from 5-methyluridine via six steps in 34% overall yield, in which the key step is the selective acylation of 5-methyluridine by propionyl chloride.