By using allyl bromide and tin powder in THF in the presence of a small amount of water, a selective allylation of aldehyde containing functional groups reactive toward Grignard reagents such as hydroxyl, phenolic hydroxyl, aromatic nitro and keto groups within the mol. can be achieved. The yield for aliphatic and aromatic aldehydes are in the range of 80-90% and 50-80% resp.

Key words: TIN, BROMOHYDROCARBON, ALCOHOL, STEREOSELECTIVITY, ALDEHYDES, NUCLEOPHILIC REACTION, ADDITION REACTION, PROPENE P, ALLYLATION