Abstract
In this work, we investigate using carbon dioxide (CO2) as an inexpensive reaction medium during the photocatalytic oxidative coupling of primary amines to the corresponding imines. As a model syst...
Highlights
From the beginning of the 21st century, an extended branch of organic chemistry moved to the investigation of photocatalysis
In order to verify the possibility of using primary amines for capturing CO2 and to verify their photocatalytic coupling using K-PHI, we performed a series of preliminary tests in acetonitrile solvent under various conditions (Table 1)
When a different carbon nitride was used, i.e., mesoporous graphitic carbon nitride (mpg-CN), the conversion decreased to 38% (Table 1, entry 2)
Summary
From the beginning of the 21st century, an extended branch of organic chemistry moved to the investigation of photocatalysis This is a vast field of research covering a multitude of applications in organic synthesis, often characterized by reactions operated under mild conditions, in terms of temperature, pressure, and media.[1] photocatalysts show a great versatility as they can promote both oxidation and reduction reactions on their surface and the same material is often able to favor diverse chemical reactions.[2,3]. Water was demonstrated to act as an electron acceptor in the oxidative coupling of amines, favoring the conversion rate.[25] As a result, we propose a photocatalytic method that uses long-living radicals of K-PHI and “wet but cheap” CO2 as a weak Lewis acid reaction medium in order to activate benzylamines for illuminationdriven electron accumulation in semiconductors (IDEAS)[4] and for efficient conversion to imines
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