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2,6-吡啶二甲酸
教授,您好!国内和国际上现在有这种吡啶的生产厂家吗?网上查不到相关信息,您的经验丰富,不知您对它是否有所了解或有无相关信息?
咨询者:王思思 咨询时间:2006-08-25 状态:已回复
- 专家 张元发 解答表达感谢 继续咨询该问题 参与讨论
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United States Patent 4,419,515
Ghelli , et al. December 6, 1983
Two stage process for preparing 2,6-pyridinedicarboxylic acid
Abstract
This invention relates to a two stage process for preparing 2,6-pyridinedicarboxylic acid or dipicolinic acid from 2,6-dimethyl-pyridine through oxidation of the latter in an acid environment with hexavalent chromium salts and formation of a molar addition compound between dicarboxylic acid, being formed by oxidation, and chromic anhydride in the first stage, and subsequent hot hydrolysis of the addition product so obtained, thus isolating 2,6-pyridinedicarboxylic acid therefrom in the second stage. The invention also comprises the above mentioned intermediate complex addition compound and the 2,6-pyridinedicarboxylic acid of high purity, obtained by the process according to said invention.
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yfzhang8888@163.com回复:张元发 回复时间:2006-08-26
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