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Some Catalytic Problems in Reductive Amination of Aldehydes and Ketones
Published in Mike G. Scaros, Michael L. Prunier, Catalysis of Organic Reactions, 2017
The effectiveness of Pt/C for hydrogenation of such imines with potential steric hindrance may indicate a greater number of edge and/or comer sites where both isomers are able to adsorb or a greater resistance to poisoning because of intrinsically higher activity. Highly accessible sites would also favor hydrogenolysis of the hemi-aminal to alcohol by-products. Alternatively, perhaps both amine and alcohol are formed with Pt/C by hydrogenolysis of the hemi-aminal rather than hydrogenation of the imine.
From small molecules to polymeric probes: recent advancements of formaldehyde sensors
Published in Science and Technology of Advanced Materials, 2022
Swagata Pan, Subhadip Roy, Neha Choudhury, Priyanka Priyadarshini Behera, Kannan Sivaprakasam, Latha Ramakrishnan, Priyadarsi De
An aminal group is a type of organic compound, having two amine groups attached to the same carbon atom. It has a general chemical formula -C(NR2)(NR2)-. When FA reacted with this diamine moiety, a condensation reaction took place and an imino intermediate was formed. This intermediate consequently opens the intramolecular deoxylactam, thus forming a strongly fluorescent ring-opened imidazole product (Figure 5(a)).
The Knoevenagel reaction: a review of the unfinished treasure map to forming carbon–carbon bonds
Published in Green Chemistry Letters and Reviews, 2020
Koen van Beurden, Steffijn de Koning, Dennis Molendijk, Jack van Schijndel
Just as Emil Knoevenagel already mentioned, the use of secondary amines yields catalytic intermediates like aminals for aldehydes or enamines for ketones. The primary amines produce Schiff-base intermediates. For completion, ammonia is taken into account, which establishes a double-Schiff-base in its reaction mechanism (46,47). Scheme 6 shows an overview of the catalytic intermediates of all the suitable amines.