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qyl541886

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This methodology is mild and efficient and is compatible with several functional groups other than the alcohol.Substrates with methoxy-substituted aromatic rings are subjected to the TEMPO/TCCA oxidation, but surprisingly the reaction affords only the corresponding aldehydes (Table 1, entries 7 and 8). Unexpectedly, this
procedure failed in the oxidations of unsaturated alcoholsas well. Contrary to what was observed carrying out the oxidation in the absence of water, the treatment of
unsaturated alcohols with 2 equiv of trichloroisocyanuricacid and catalytic TEMPO, under the present conditions,proceeded to the corresponding carboxylic acid and to the contemporary addition to the double bond
. The oxidation of trans-cinnamic alcohol furnished in fact (2RS,3SR)-2,3-dichloropropionic acid. The amount of chlorinationreaction is diminished operating with equimolar amounts
of TCCA, but in this case the rate of the reaction is very
reduced. To determine if this behavior was general for
the double bond, we carried out the reaction with (E)-
1,1-diethoxy-3-phenyl-2-propene under the same condi-
tions. After complete conversion of the alkene, (2RS,3SR)-
1,1-diethoxy-2,3-dichloro-3-phenylpropane was obtained
quantitatively.

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qyl541886

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carrying out the oxidation in the absence of water 是observed 还是不是,?
present conditions是“现在的条件”么?
2楼2011-02-11 22:06:51
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qyl541886(金币+1): 2011-02-14 22:02:53
与在水存在下的该类氧化反应不同(对比在水存在下的该类氧化反应),不饱和醇在2当量的三氯异氰尿酸和催化量的TMEMPO存在下,在已有的(已存在的)条件下发生的氧化反应,产生相应的羧酸以及双键上的加成产物。
3楼2011-02-12 09:00:47
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qyl541886(金币+1, 翻译EPI+1): 2011-02-14 22:02:45
引用回帖:
Originally posted by qyl541886 at 2011-02-11 22:06:51:
carrying out the oxidation in the absence of water 是observed 还是不是,?
present conditions是“现在的条件”么?


present conditions是指文献中的现有的条件
4楼2011-02-12 09:02:57
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