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Benzaldehyde (C 6 H 5 CHO) is an organic compound consisting of a benzene ring with a formyl substituent. It is among the simplest aromatic aldehydes and one of the most industrially useful. It is a colorless liquid with a characteristic almond -like odor , and is commonly used in cherry -flavored sodas . [ 5 ]
In the lab, phenyl-2-nitropropene is produced by the reaction of benzaldehyde and nitroethane in the presence of a basic catalyst like n-butylamine.The reaction is a nitroaldol reaction, and is a variant of a Knoevenagel condensation reaction, which is one of a broader class of reactions called Henry condensations, or simply Henry reactions.
The reaction is named after Russian organic chemist Vyacheslav Tishchenko, who discovered that aluminium alkoxides are effective catalysts for the reaction. [ 1 ] [ 2 ] [ 3 ] In the related Cannizzaro reaction , the base is sodium hydroxide and then the oxidation product is a carboxylic acid and the reduction product is an alcohol .
In organic chemistry, the benzoin addition is an addition reaction involving two aldehydes (−CH=O). The reaction generally occurs between aromatic aldehydes or glyoxals (OCH=CHO), [1] [2] and results in formation of an acyloin (−C(O)CH(OH)−). In the classic example, benzaldehyde is converted to benzoin (PhCH(OH)C(O)Ph). [3]
The reaction process begins with the deprotonation of 2-nitropropane at the α carbon to form a nitronate. This compound then initiates an S N 2 reaction to displace the benzyl halide. Unlike in the nitroaldol reaction , where the deprotonated carbon of the nitroalkyl group is the nucleophilic atom, it is instead an oxygen of the nitro itself ...
The Baeyer–Drewsen indigo synthesis (1882) is an organic reaction in which indigo is prepared from 2-nitrobenzaldehyde and acetone [1] [2] The reaction was developed by von Baeyer and Viggo Drewsen in 1880 to produce the first synthetic indigo at laboratory scale. This procedure is not used at industrial scale.
Of its many reactions, 2-methylbenzaldehyde undergoes BF 3-induced Rothemund condensation with pyrrole to give atropoisomers of tetrakis(o-tolyl)porphyrin. [2] It is one of main benzaldehyde component of automobile exhaust. [3]
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