单语范例（未经PONS编辑处理）
英语
- After formation of the chromate ester, either deprotonation or hydride transfer leads to the product carbonyl compound.en.wikipedia.org
- The structure of the carbonyl compound is important, as -substitution and nearby angular substituents sterically disfavor 1,4-addition.en.wikipedia.org
- The proton transfer leads to intermediate 4, which undergoes the key fragmentation to alkyne (6) and the corresponding carbonyl compound (7).en.wikipedia.org
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