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A process for the addition reaction of an unsaturated organic compound, except a rubber, having at least one carbon-carbon double bond in a molecule, which comprises reacting the unsaturated organic compound with an organic compound having a carboxyl group and an aldehyde group in the presence of a

A process for the addition reaction of an unsaturated organic compound, except a rubber, having at least one carbon-carbon double bond in a molecule, which comprises reacting the unsaturated organic compound with an organic compound having a carboxyl group and an aldehyde group in the presence of a Lewis acid.

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A process for the addition reaction of a nonrubbery unsaturated organic compound having at least one carbon-carbon double bond in its molecule, wherein the compound is selected from the group consisting of 2-methyl-2-butene, 1-methylcyclohexene, alpha-methyl styrene, an isoprene homopolymer, an isop

A process for the addition reaction of a nonrubbery unsaturated organic compound having at least one carbon-carbon double bond in its molecule, wherein the compound is selected from the group consisting of 2-methyl-2-butene, 1-methylcyclohexene, alpha-methyl styrene, an isoprene homopolymer, an isoprene copolymer, squalene, chicle, 4-methyl-2-pentene, dicyclopentadiene, 1,3-pentadiene homopolymer, 1,3-pentene, copolymer, an ethylidene norbornene homopolymer, an ethylidene norbornene copolymer, a dicyclopentadiene homopolymer, a dicyclopentadiene copolymer, 1- or 2-butene, 1-, 2-, 3-, or 4-octene, cyclohexene, a butadiene homopolymer and a butadiene copolymer, which comprises reacting (A) the unsaturated organic compound with (B) an aromatic compound having a benzene ring, a naphthalene ring, a pyridene ring or a furan ring; a linear aliphatic compound having up to about 20 carbon atoms; or an alicyclic organic compound having a cyclopentane, cyclopentene, or cyclohexane ring, and having a carboxyl group and an aldehyde group, in the presence of a Lewis acid and a solvent, at a temperature of 0°to 100°C., said compound (B) having the carboxyl group and aldehyde group being used in an amount of 0.0001 to 2 moles per mole of the compound (A) and said Lewis acid being used in an amount of 0.01 to 5 moles per mole of the compound (B).