在二碳酸盐溶液中的基因的催化环氧化
Benjamin S Lane1, Matthew Vogt, Victoria J DeRose
1Department of Chemistry, Texas A & M University, P.O. Box 30012, College Station, TX 77842-3012, USA.
Journal of the American Chemical Society
|October 3, 2002
概括
这项研究介绍了一种使用过氧化的催化环氧化方法. 诸如酸和酸等添加剂可提高反应速度和效率,用于更广泛的基质范围.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 绿色化学 绿色化学
背景情况:
- 烯环氧化是有机合成中至关重要的转化.
- 开发使用环保无害氧化剂的高效和选择性环氧化方法是关键的研究领域.
- 过氧化为传统氧化剂提供了一个可持续的替代品,但通常需要激活和仔细控制.
研究的目的:
- 用过氧化来发现和优化利用过氧化进行烯环氧化的催化系统.
- 识别可提高反应效率,基质范围和过氧化利用率的添加剂.
- 探索由促进的环氧化过程的催化循环和机械方面.
主要方法:
- 过渡金属盐的并行选,以确定烯环氧化催化剂.
- 优化反应条件,包括使用二碳酸盐缓冲剂和溶剂 (DMF,tBuOH).
- 选各种化合物作为添加剂,以提高环氧化速率和选择性.
- 电子磁共振 (EPR) 研究,以调查在反应过程中催化剂的行为.
主要成果:
- 发现 (II) 盐,特别是MnSO (IV) 盐,是用过氧化对烯环氧化物的有效催化剂.
- 反应通过过氧单碳酸盐的形成进行,需要二碳酸盐缓冲剂.
- 诸如酸盐和酸等添加剂显著提高了环氧化率 (2-3倍),并改善了对较少反应性的基的产量.
- 开发的方法证明了对基替代,循环和基替代基的有效性,但不是单基基.
结论:
- 使用过氧化开发了一种新且高效的催化烯的环氧化.
- 添加特定化合物大大提高了反应的效率,并扩大了其基质适用性.
- 这种方法为有机合成中更绿色,更经济的烯环氧化提供了一个有希望的途径.
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