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A primary imine in which C is attached to both a hydrocarbyl and a H (derived from an aldehyde) is called a primary aldimine; a secondary imine with such groups is called a secondary aldimine. [10] A primary imine in which C is attached to two hydrocarbyls (derived from a ketone) is called a primary ketimine; a secondary imine with such groups ...
The Schiff base is an electrophile which reacts in a second step in an electrophilic addition with an enol formed from a carbonyl compound containing an acidic alpha-proton. The Mannich reaction is a condensation reaction. [4]: 140 In the Mannich reaction, primary or secondary amines or ammonia react with formaldehyde to form a Schiff base ...
General structure of an imine. Schiff bases are imines in which R 3 is an alkyl or aryl group (not a hydrogen). R 1 and R 2 may be hydrogens General structure of an azomethine compound. In organic chemistry, a Schiff base (named after Hugo Schiff) is a compound with the general structure R 1 R 2 C=NR 3 (R 3 = alkyl or aryl, but not hydrogen).
Reaction of cyclohexylamine with acetaldehyde forming an imine. Sodium sulfate removes water [1] In organic chemistry, alkylimino-de-oxo-bisubstitution is the organic reaction of carbonyl compounds with amines to imines. [2] The reaction name is based on the IUPAC Nomenclature for Transformations.
Terphthalaldehyde is used in the preparation of imines, which are also commonly referred to as Schiff bases, following a condensation reaction with amines. During this reaction, water is also formed. This reaction is by definition reversible, thus creating an equilibrium between aldehyde and amine on one side, and the imine and water on the other.
Polyimines can be synthesised via a condensation reaction between aldehydes and (primary) amines. [2] During this reaction, water is also formed as byproduct. Often, the synthesis can be performed at room temperature, but to fully cure the materials and remove remaining water, they can be dried at slightly elevated temperatures and/or in vacuum.
First, the nickel metal dehydrogenates the alcohol to form a ketone and Ni-H complex. Then, the ketone reacts with ammonia to form an imine. Finally, the imine reacts with Ni-H to regenerate catalyst and form primary amine. An example of a homogeneous catalytic system is the reductive amination of ketones done with an iridium catalyst. [20]
Instead of conversion of the cyanohydrin to a lactone, the cyanohydrin is reduced with hydrogen, using palladium on barium sulfate as the catalyst and water as the solvent, to form an imine. Due to the presence of water, the imine quickly hydrolyzes to form an aldehyde, thus the final sugars are produced in just two steps rather than three.