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Indane is reacted with an α,α-dichloromethyl lower alkyl ether, the reaction mixture is treated with water to produce a mixture of 4-formylindane and 5-formylindane, the aldehyde isomers are separated and the aldehydes are catalytically hydrogenated to produce 4-methylindane and 5-methylindane.

1. customto produce
2. customthe aldehyde isomers are separated