What is Itart reactions ?
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Answer:
Sandmeyer Reaction: The Sandmeyer reaction is a chemical reaction which is used to synthesize aryl halides from aryl diazonium salts.
Explanation:
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Answer:
The Sandmeyer reaction is a chemical reaction which is used to synthesize aryl halides from aryl diazonium salts. ... The Br, Cl and Cn nucleophiles can be easily present in the benzene ring of benzene diazonium salt in the presence of Copper ion.
Explanation:
The reaction was discovered in 1884 by Swiss chemist Traugott Sandmeyer, when he attempted to synthesize phenylacetylene from benzenediazonium chloride and cuprous acetylide. Instead, the main product he isolated was phenyl chloride. In modern times, the Sandmeyer reaction refers to any method for substitution of an aromatic amino group via preparation of its diazonium salt followed by its displacement with a nucleophile in the presence of catalytic copper(I) salts. (Due to the low cost of copper salts, a stoichiometric amount is often employed for better reactivity even when catalysis is possible.) The most commonly employed Sandmeyer reactions are the chlorination, bromination, cyanation, and hydroxylation reactions using CuCl, CuBr, CuCN, and Cu2O, respectively. More recently, trifluoromethylation of diazonium salts has been developed and is referred to as a 'Sandmeyer-type' reaction. Diazonium salts also react with boronates, iodide, thiols, water, hypophosphorous acid and others,[5] and fluorination can be carried out using tetrafluoroborate anions (Balz–Schiemann reaction). However, since these processes do not require a metal catalyst, they are not usually referred to as Sandmeyer reactions. In numerous variants that have been developed, other transition metal salts, including copper(II), iron(III), and cobalt(III) have also been employed.[6] Due to its wide synthetic applicability, the Sandmeyer reaction, along with other transformations of diazonium compounds, is complementary to electrophilic aromatic substitution.