The Sandmeyer Reaction: Substitution for an NH on an.

Diazotisation. The nitrosation of primary aromatic amines with nitrous acid (generated in situ from sodium nitrite and a strong acid, such as hydrochloric acid, sulfuric acid, or HBF 4) leads to diazonium salts, which can be isolated if the counterion is non-nucleophilic. Diazonium salts are important intermediates for the preparation of halides (Sandmeyer Reaction, Schiemann Reaction), and.

This reaction is often the key catalytic step in the synthesis of heterocyclic compounds followed by intramolecular heterocyclization. Porous catalytic systems have been reported to be in use in the preparation of O-heterocycles through Knoevenagel condensation, particularly in the synthesis of chromenes, coumarins, and xanthenediones.

The conversion of p-chloronitrobenzene to p-chloroaniline was cited as an example in the text to illustrate reduction of aromatic nitro compounds to arylamines. p-Chloronitrobenzene is prepared by nitration of chlorobenzene.. This problem illustrates the application of the Sandmeyer reaction to the preparation of aryl cyanides. Diazotization.

Dispersing agents in reaction media.. underwent a normal Sandmeyer reaction to give p-cyanobenzoic acid in good yields.. surfaces than those primary-amine-type inhibitors described in our.

Halogenation at an alkyl carbon and an allylic carbon, hydroxylation at an aliphatic carbon, hydroxylation at an aromatic carbon, oxidation of aldehydes to carboxylic acids, formation of hydroperoxides and peroxides, Gomberg-Bachmann reaction, Meerwein arylation, Sandmeyer reaction, Kolbe reaction and Hunsdiecker reaction.

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This is most widely used for the preparation of organo-boron, -tin, -zinc and -silicon compounds by reaction with organolithium or magnesium reagents. 4.1.1 Lithium2 Lithio-heterocycles have proved to be the most useful organometallic derivatives: they react with the whole range of electrophiles in a manner exactly comparable to that of.

Organic Syntheses Collective Volume 4.. The reaction mixture is stirred at room temperature for 2 hours under nitrogen, during which period the hydroquinone diacetate gradually dissolves. The pale yellow solution is poured onto 500 g. of chopped ice, and the colorless or faintly yellowish solid is collected by suction filtration and dried.