Method for preparing n-($g(v)-bromoalkyl)phthalimides

Procedure for preparation of N-(ω-bromoalkyl)phthalimides with formula:

• 8
• in which n is a whole number from 2 to 8, and preferably, from 3 to 6, R represents a hydrocarbon radical, straight-chain or branched, with 1 to 4 carbon atoms, a halogen atom such as Cl or Br, or an alkoxy radical such as CH3O—, x is equal to 0, 1, 2, 3 or 4 and when x=2, 3 or 4, the R radicals may be identical or different, which consists of reacting potassium phthalimide (II) with an α,ω-dibromoalkane (III) according to reaction (1):
• 9
• characterized in that it consists of carrying out the condensation reaction (1) of the potassium phthalimide (II) with the α,ω-dibromoalkane (III) without cosolvent, under stirring at a temperature from 50° C. to 130° C., by using a molar ratio of α,ω-dibromoalkane (III) to potassium phthalimide (II) from 2.5 to 6, then of removing the excess α,ω-dibromoalkane (III) under reduced pressure at a temperature equal to 150° C. at most, of taking up the reaction medium again with a low boiling point alcohol at a temperature near the boiling point of said alcohol, of filtering at this temperature, of cooling the filtrate obtained, and then of recovering the resulting crystallized product (I) by filtration followed by drying under reduced pressure at a temperature equal to 50° C. at most.