Textbook catalytic hydrogenations are typically presented as reactions done in organic solvents and oftentimes under varying pressures of hydrogen using specialized equipment. Catalysts new and old are all used under similar conditions that no longer reflect the times. By definition, such reactions are both environmentally irresponsible and dangerous, especially at industrial scales. We now report on a general method for chemoselective and safe hydrogenation of olefins in water using ppm loadings of palladium from commercially available, inexpensive, and recyclable Pd/C, together with hydrogen gas utilized at 1 atmosphere. A variety of alkenes is amenable to reduction, including terminal, highly substituted internal, and variously conjugated arrays. In most cases, only 500 ppm of heterogeneous Pd/C is sufficient, enabled by micellar catalysis used in recyclable water at room temperature. Comparison with several newly introduced catalysts featuring base metals illustrates the superiority of chemistry in water.

中文翻译：

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对环境负责，安全和化学选择性的烯烃催化加氢：室温下可回收水中的ppm级Pd催化

教科书中的催化加氢通常表示为在有机溶剂中进行的反应，通常是使用专用设备在变化的氢气压力下进行。新催化剂和旧催化剂都在相似的条件下使用，不再反映时代。根据定义，这种反应在环境上既不负责任又危险，特别是在工业规模上。现在，我们报告一种使用从商业上可买到的，便宜的和可回收的Pd / C中加入的ppm钯钯，以及在1个大气压下使用的氢气，对水中的烯烃进行化学选择性和安全氢化的一般方法。各种烯烃都适合还原，包括末端，高度取代的内部和各种共轭阵列。在大多数情况下，仅500 ppm的异质Pd / C就足够了，室温下可循环水中使用的胶束催化可实现此功能。与几种新引入的以贱金属为特征的催化剂的比较说明了水中化学的优越性。