On treating phenol with chloroform in the presence of sodium hydroxide, a –CHO group is introduced at ortho position of benzene ring. This reaction is known as Reimer- Tiemann reaction . The intermediate substituted benzal chloride is hydrolysed in the presence of alkali to produce salicylaldehyde. Learn how to convert a phenol into an o-hydroxy benzaldehyde using chloroform, a base, and an acid in the Reimer - Tiemann reaction . See the reaction mechanism, application, examples, and related reactions. Reimer-Tiemann Reaction About Reimer-Tiemann Reaction An alkaline solution of phenol is refluxed with chloroform at 60°C, distilling off the excess of chloroform and acidifying the residual liquid with sulphuric acid. As a result, o-hydroxy and p-;hydroxy benzaldehyde are formed, which are separated by steam-distillation. Reaction Mechanism of Reimer-Tiemann Reaction If ‘o’ both the o-positions are blocked, p-hydroxy benzaldehyde is the main product. With blocked p-position, o-hydroxy ... The Reimer-Tiemann reaction is a type of substitution reaction named after two chemists Karl Reimer and Ferdinand Tiemann . The reaction is employed for the ortho-formylation of C 6 H 5 OH (phenols). Reimer-Tiemann reaction is a chemical reaction used for producing phenolic aldehydes under the action of chloroform and caustic alkaline on phenol in industries. Reimer-Tiemann reaction is an aromatic substitution reaction with great industrial importance. The Reimer - Tiemann response uses a ...
