Chemical Spectroscopy photochemical organic reactions in micro reactors

化学光谱学微型反应器中的光化学有机反应

• 批准号: 295620686
• 负责人: Professor Dr.-Ing. Roland Dittmeyer, since 4/2022
• 金额: --
• 依托单位: Institut für Organische Chemie (IOC)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/295620686?language=en
• 关键词: Chemical; Spectroscopy; photochemical; organic; reactions

Photochemistry is an important method for the production of important and valuable chemicals, especially for medical applications (for example, anti-cancer drugs). However the current methods often used to synthesise these compounds (batch synthesis in stirred reactors) is limited, it does not allow for effective up-scaling of the production, nor does it allow for the exploitation of unique reaction pathways where careful control of reaction time and exposure to light is required. To address these challenges, this project proposes a coordinated approach bringing together expertise in chemistry, process engineering and in situ analytic technqiues, to explore continuous flow photochemistry with an unprecendented level of real-time insight into reaction progress and conditions. The photoredox-catalysed acylation of indoles and indazoles, as well as the oxidative cyclization to acylindoles will be explored in flow micro reactors, utilizing in situ concentration sensors exploiting the variable IR absorption of the reaction/product mixtures, which will be detected using novel detectors based on Fabry-Perot filters. These filters will expand on initial discoveries in Phase 1 of the proposal, where static filters with stepped spacings between the multi-layer Bragg mirrors, were developed and proven effective in monitoring the progress of 2,1- Benzoxalonone synthesis. A major development will be to expand the capability of these sensors be replacing the static separators with liquid crystal elastomers, whose dimensions can be changed by heating. This will enable the sensors to be independently tuned to different target IR wavelengths, and making them adaptable to a range of different chemistries. These advanced sensors will be implemented in a number of standalone reactors looking at different reaction steps in the target chemistry, with a particular focus on obtaining useful reaction kinetic parameters for the separate reaction steps, under micro reactor flow photochemistry conditions. In the final part of the project, bringing together the different contributions will allow for the sensors to be deployed in multiple reactors, separators and other process units in a continuous flow, multi-step system, will a control system making full use of the real-time composition data provided by the IR sensors. Complementing this robust experimental work, will be a parallel modeling activity, where both analytical and numerical models of photochemistry in a microfluidic flow channel will be carried out. The model results will be compared to the obtained experimental results, providing additional insight into the flow photochemistry system and especially providing useful guidance in designing future flow photo reactors.

光化学是生产重要和有价值的化学品的重要方法，特别是用于医疗应用（例如抗癌药物）。然而，目前通常用于合成这些化合物的方法（在搅拌反应器中的分批合成）是有限的，它不允许生产的有效放大，也不允许开发需要仔细控制反应时间和暴露于光的独特反应途径。为了应对这些挑战，该项目提出了一种协调的方法，将化学，工艺工程和原位分析技术的专业知识结合在一起，以探索连续流光化学，并对反应过程和条件进行前所未有的实时洞察。光氧化还原催化的吲哚和吲唑的酰化，以及氧化环化为酰基吲哚将探索在流动微反应器，利用原位浓度传感器利用可变的红外吸收的反应/产物混合物，这将使用基于法布里-珀罗滤波器的新型检测器检测。这些滤波器将扩展该提案第1阶段的初步发现，其中开发了多层布拉格镜之间具有阶梯式间距的静态滤波器，并证明其在监测2，1-苯并异丁酮合成过程中有效。一个主要的发展将是扩大这些传感器的能力，用液晶弹性体取代静态分离器，其尺寸可以通过加热来改变。这将使传感器能够独立地调谐到不同的目标红外波长，并使它们适应一系列不同的化学物质。这些先进的传感器将在许多独立的反应器中实施，这些反应器将观察目标化学中的不同反应步骤，特别关注在微反应器流动光化学条件下获得单独反应步骤的有用反应动力学参数。在该项目的最后部分，将不同的贡献汇集在一起，将允许传感器部署在多个反应器，分离器和连续流，多步骤系统中的其他过程单元中，将控制系统充分利用红外传感器提供的实时成分数据。补充这一强大的实验工作，将是一个平行的建模活动，其中分析和数值模型的光化学在微流体流动通道将进行。模型结果将得到的实验结果进行比较，提供额外的洞察流光化学系统，特别是在设计未来的流光反应器提供有用的指导。