9,10-Dicyanoanthracene (DCA)-sensitized photooxidation reactions of hindered phenols and catechols (1) proceed via the initial electron transfer from 1 to 1DCA*. 4-Hydroperoxy-2,5-cyclohexadien-1-ones and 4-hydroxy-2,5-cyclohexadien-1-ones are obtained from 2,4,6-trialkyl-substituted phenols, and an o-benzoquinone and furanone derivatives are afforded from 3,5-di-t-butylcatechol.
Multigram Synthesis of Trioxanes Enabled by a Supercritical CO<sub>2</sub> Integrated Flow Process
作者:Lingqiao Wu、Bruna L. Abreu、Alexander J. Blake、Laurence J. Taylor、William Lewis、Stephen P. Argent、Martyn Poliakoff、Hamza Boufroura、Michael W. George
DOI:10.1021/acs.oprd.1c00111
日期:2021.8.20
continuous approach using a custom-built high-pressure sapphire photoreactor to synthesize trioxanes via the dearomatization of para-substituted phenols by photogenerated singlet oxygen in supercriticalCO2. CO2 also facilitates mixing with O2 and has lower viscosity, thereby improving penetration into the pores of the solid acid catalyst used for the formation of trioxanes. We show the capabilities
高活性氢过氧化物的光化学合成及其转化为有用的产品,如 1,2,4-三恶烷,在合成有机化学和药物制造中具有广泛的兴趣,特别是因为它们与潜在的抗疟疾和抗癌治疗药物相关,例如,青蒿素。一类抗疟药物基于 1,2,4-三恶烷支架,但由于它们在可氧化溶剂中的不稳定性,以克规模生产此类化合物具有挑战性。此外,目前的方法使用固体氧化剂,这使得连续加工成为问题,或者使用分子氧,需要长达 48 小时的长反应时间。在这里,我们报告了一种新的多克连续方法,使用定制的高压蓝宝石光反应器通过脱芳构化合成三恶烷光生单线态氧在超临界 CO 2 中对位取代的苯酚。CO 2还促进与O 2 的混合并且具有较低的粘度,从而提高对用于形成三恶烷的固体酸催化剂的孔的渗透。我们展示了 5.2 mL 反应器将反应放大到 67 g/天的能力。这种合成方法提供了一个平台,可以在流动条件下快速获取高价值化合物,原子效率高、产率高、反应时间短,并且无需分离危险中间体。
PROCESS AND DEVICE FOR THE OXIDATION OF ORGANIC COMPOUNDS
申请人:Teles Joaquim H
公开号:US20110087038A1
公开(公告)日:2011-04-14
The invention relates to a process for the oxidation of organic compounds by means of oxygen, in which, in a first step, the organic compound and at least part of the oxygen required for the oxidation are introduced into a first reaction zone which is operated isothermally and with backmixing and, in a second step, the reaction mixture from the first reaction zone is introduced into a second reaction zone which is operated adiabatically. The invention further relates to a reactor for carrying out the process, which comprises at least one isothermal reaction zone (
3, 5
) and an adiabatic reaction zone (
7
) which are arranged in a reactor shell (
8
), with each isothermal reaction zone (
3, 5
) being configured in the form of a jet loop reactor and the adiabatic reaction zone (
7
) being configured as a bubble column.
PROCESS AND APPARATUS FOR OXIDIZING ORGANIC COMPOUNDS
申请人:Teles Joaquim H.
公开号:US20110137077A1
公开(公告)日:2011-06-09
The invention relates to a process for oxidizing at least one organic substance with oxygen, which comprises the following steps:
(a) adding the at least one organic substance as a liquid and an oxygenous gas stream to a first reaction stage to form a reaction mixture, at least some of the oxygen reacting with the organic compound to form a reaction product,
(b) adding the reaction mixture from the first reaction stage to an adiabatically operated reaction stage in which the unconverted organic substance reacts further at least partly to give the product.
The invention further relates to an apparatus for performing the process.
Nature inspired singlet oxygen generation to access α-amino carbonyl compounds <i>via</i> 1,2-acyl migration
作者:Waldemar Schilling、Yu Zhang、Prakash Kumar Sahoo、Samir Kumar Sarkar、Sivaraman Gandhi、Herbert W. Roesky、Shoubhik Das
DOI:10.1039/d0gc03555f
日期:——
We have discovered chlorophyll catalyzed 1,2-acyl migration reactions to achieve α-amino carbonyl compounds directly from the enaminones. In general, singlet oxygen is generated during photosynthesis in the photosystem II center. This singlet oxygen can readily react with the unsaturated double bonds present in biomolecules. This reactivity intrigued us to apply this concept towards unsaturated enaminones
我们发现叶绿素催化的1,2-酰基迁移反应可直接从烯胺酮中获得α-氨基羰基化合物。通常,在光合作用II中心的光合作用过程中会产生单线态氧。该单线态氧可以容易地与生物分子中存在的不饱和双键反应。这种反应性促使我们将这一概念应用于不饱和烯胺酮和其他化合物,以获得高价值的化合物。实际上,这种光敏剂非常便宜,可商购,以主族金属为基础,并且通过实现高营业额数(TON)> 300和高营业额频率(TOF)为50 h -1,为单重态氧介导的化学反应提供了出色的效率。。最后,DFT计算和详细的机械实验相结合,提供了光敏剂的确切作用以及对反应的清晰见解。