枕垫
发表于 2025-3-28 17:35:56
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召集
发表于 2025-3-28 22:02:50
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epicardium
发表于 2025-3-29 02:59:38
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试验
发表于 2025-3-29 04:50:14
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雄辩
发表于 2025-3-29 07:52:15
Cyclopropane Derivatives,ar when an alkyl chain is the substituent. They include a vibration near 1070 cm., which is given the general assignment δ′(chain)?. The question mark indicates that it is an unknown group frequency. If a methyl group is present, a band near 1150 cm. is found, and this is assigned as δ′(CH.)?. If tw