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What are the Rosenmund Reduction reaction and Stephen Reaction? Give an examples.

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Rosenmund Reaction :

Acylchlorides when hydrogenated over catalyst, palladium on barium Sulphate yield aldehydes. Sulphur and Quinolene can be used as poison. 

Ex :

Stephen Reaction :

Nitriles are reduced to corresponding imines with stannous chloride in the presence of Hydrochloric acid, which on hydrolysis give corresponding aldehyde.

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