作者yutsao (一包)
看板Chemistry
标题Re: [学习] 想请教一题有机考题
时间Sat Nov 13 22:58:50 2010
※ 引述《ISME0907 (ISME)》之铭言:
: Which statement about the aldol condensation is correct?
: A)A Lewis acid is commomly used as a catalyst.
酸硷都可以吧?
: B)The initial step is probablt the formation of a carbanion.
都没有cation的形成啊。
base cat的话是形成enolate,acid cat形成protonated carbonyl。
: C)A Lewis base is employed to induce carbocation formation
enolate
: D)The carbon chain is lengthened through the elimination of 1 mole of water.
没这回事…(看看反应机构吧,都是enolate或enol打上去)
: E)None of them.
: 此题答案为E,可是我只改的出C错是错在变induce enolate;可以麻烦高手解一下ABD?
: 谢谢大家罗~
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 123.192.20.21
1F:→ ISME0907:^^~谢谢罗 11/14 01:44
2F:推 oook:我觉得A选项不能选的理由可能是因为错在"Lewis acid" 11/15 20:27
3F:→ oook:酸应该是要可proton的酸让第一步变成enol form再去反应 11/15 20:29