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Two-Step Laser Photolysis of Flavone and NaBH4 at Organic—Aqueous Liquid Interface Using a Microchannel Reactor: A Method to Avoid Secondary Thermal Side Reactions

Two-Step Laser Photolysis of Flavone and NaBH4 at Organic—Aqueous Liquid Interface Using a... Abstract A microchannel reactor was used for suppressing undesirable side reactions in a photochemical reaction. A two-step photolysis, flavone (1)→flavanone (2)→salicylic acid (3b), was conducted in a microchannel reactor using a two-phase photolysis, that is, 1 and NaBH4 were dissolved in immiscible H2O and hexane, respectively, and photolyses were conducted at their interface. The two-step photolysis product 3b was obtained as a major product. In contrast, photolysis in homogeneous EtOH solution gave flavanol (4) as a major product. The thermal side reaction 2→4 was suppressed completely by the interface photolysis, and a greater than 25-fold increase was observed in the selectivity of 3b. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Flow Chemistry Springer Journals

Two-Step Laser Photolysis of Flavone and NaBH4 at Organic—Aqueous Liquid Interface Using a Microchannel Reactor: A Method to Avoid Secondary Thermal Side Reactions

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References (70)

Publisher
Springer Journals
Copyright
2014 Akadémiai Kiadó
ISSN
2062-249X
eISSN
2063-0212
DOI
10.1556/jfc-d-14-00025
Publisher site
See Article on Publisher Site

Abstract

Abstract A microchannel reactor was used for suppressing undesirable side reactions in a photochemical reaction. A two-step photolysis, flavone (1)→flavanone (2)→salicylic acid (3b), was conducted in a microchannel reactor using a two-phase photolysis, that is, 1 and NaBH4 were dissolved in immiscible H2O and hexane, respectively, and photolyses were conducted at their interface. The two-step photolysis product 3b was obtained as a major product. In contrast, photolysis in homogeneous EtOH solution gave flavanol (4) as a major product. The thermal side reaction 2→4 was suppressed completely by the interface photolysis, and a greater than 25-fold increase was observed in the selectivity of 3b.

Journal

Journal of Flow ChemistrySpringer Journals

Published: Oct 1, 2014

Keywords: chemistry/food science, general; green chemistry; organic chemistry; inorganic chemistry; nanochemistry; industrial chemistry/chemical engineering

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