The present invention relates to novel amphiphilic lipids branched. In particular, the present invention relates to novel amphiphilic lipids branched of general formula (ii). The present invention also proposes a method of synthesis in the said compounds of formula (ii), on the basis of the amphiphilic compounds of general formula (i), unsaturated). The present invention also relates to the use of the compounds of general formula (ii) and lipoplexes obtained by the formulation of the compounds of general formula (ii) for applications in which it is desirable for the melting properties are improved, in particular, the transfection.