Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts

Developments that result in high-yielding, low-cost, safe, scalable, and less-wasteful processes are the most important goals in synthetic organic chemistry. Continuous-flow reactions have garnered much attention due to many advantages over conventional batch reactions that include precise control o...

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Main Authors: Naoto Sugisawa, Hiroyuki Nakamura, Shinichiro Fuse
Format: Article
Language:English
Published: MDPI AG 2020-11-01
Series:Catalysts
Subjects:
Online Access:https://www.mdpi.com/2073-4344/10/11/1321
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author Naoto Sugisawa
Hiroyuki Nakamura
Shinichiro Fuse
author_facet Naoto Sugisawa
Hiroyuki Nakamura
Shinichiro Fuse
author_sort Naoto Sugisawa
collection DOAJ
description Developments that result in high-yielding, low-cost, safe, scalable, and less-wasteful processes are the most important goals in synthetic organic chemistry. Continuous-flow reactions have garnered much attention due to many advantages over conventional batch reactions that include precise control of short reaction times and temperatures, low risk in handling dangerous compounds, and ease in scaling up synthesis. Combinations of continuous-flow reactions with homogeneous, metal-free catalysts further enhances advantages that include low-cost and ready availability, low toxicity, higher stability in air and water, and increased synthetic efficiency due to the avoidance of the time-consuming removal of toxic metal traces. This review summarizes recently reported continuous-flow reactions using metal-free homogeneous catalysts and classifies them either as acidic catalysts, basic catalysts, or miscellaneous catalysts. In addition, we compare the results between continuous-flow conditions and conventional batch conditions to reveal the advantages of using flow reactions with metal-free homogeneous catalysts.
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spelling doaj.art-7003b6d492434259abfc5e65d21c35ed2023-11-20T20:55:33ZengMDPI AGCatalysts2073-43442020-11-011011132110.3390/catal10111321Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous CatalystsNaoto Sugisawa0Hiroyuki Nakamura1Shinichiro Fuse2Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, JapanLaboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, JapanGraduate School of Pharmaceutical Sciences, Nagoya University, Nagoya 464-8601, JapanDevelopments that result in high-yielding, low-cost, safe, scalable, and less-wasteful processes are the most important goals in synthetic organic chemistry. Continuous-flow reactions have garnered much attention due to many advantages over conventional batch reactions that include precise control of short reaction times and temperatures, low risk in handling dangerous compounds, and ease in scaling up synthesis. Combinations of continuous-flow reactions with homogeneous, metal-free catalysts further enhances advantages that include low-cost and ready availability, low toxicity, higher stability in air and water, and increased synthetic efficiency due to the avoidance of the time-consuming removal of toxic metal traces. This review summarizes recently reported continuous-flow reactions using metal-free homogeneous catalysts and classifies them either as acidic catalysts, basic catalysts, or miscellaneous catalysts. In addition, we compare the results between continuous-flow conditions and conventional batch conditions to reveal the advantages of using flow reactions with metal-free homogeneous catalysts.https://www.mdpi.com/2073-4344/10/11/1321continuous-flowmicro-flowmicro-reactormetal-free catalystorganocatalysthomogeneous reaction
spellingShingle Naoto Sugisawa
Hiroyuki Nakamura
Shinichiro Fuse
Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
Catalysts
continuous-flow
micro-flow
micro-reactor
metal-free catalyst
organocatalyst
homogeneous reaction
title Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
title_full Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
title_fullStr Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
title_full_unstemmed Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
title_short Recent Advances in Continuous-Flow Reactions Using Metal-Free Homogeneous Catalysts
title_sort recent advances in continuous flow reactions using metal free homogeneous catalysts
topic continuous-flow
micro-flow
micro-reactor
metal-free catalyst
organocatalyst
homogeneous reaction
url https://www.mdpi.com/2073-4344/10/11/1321
work_keys_str_mv AT naotosugisawa recentadvancesincontinuousflowreactionsusingmetalfreehomogeneouscatalysts
AT hiroyukinakamura recentadvancesincontinuousflowreactionsusingmetalfreehomogeneouscatalysts
AT shinichirofuse recentadvancesincontinuousflowreactionsusingmetalfreehomogeneouscatalysts