No. Article 1596 of the Civil Code provides that « the following cannot become purchasers, under penalty of nullity, either by themselves or through intermediaries: […] Agents, of the goods they are responsible for selling […] »
Indeed, the agent cannot both represent the seller and acquire his property, under penalty of being in conflict of interest.
This nullity can only be invoked by the person whom the law intends to protect, i.e. the principal.