Reivindicaciones

1. PROCEDURE FOR THE SELECTIVE PREPARATION OF PARTIALLY ACYLATED MONOSACCHARIDE AND POLYOL DERIVATIVES characterized by the mixture of polyol or monosaccharide with the fatty acid, addition of a solvent, employment of lipases, the water produced during the process being removed during the process. 2. A procedure according to claim 1 characterized by the lipase being Candida antartica or Mucor miehie. 3. A procedure according to claim 1 characterized by the employment of a reaction medium whose water content is controlled in the range of 0.001 and 5% w/w. 4. A procedure according to claims 1 and 3 characterized because it is performed between 0 and 60ºC. 5. A procedure according to claims 1,3 and 4 characterized in that the concentration of fatty acids exceeds 100 mM and are in a molar excess of at least 1.5 fold the concentration of the sugar. 6. A procedure according to claims 1,3,4, and 5 characterized by the employment of different fatty acids of variable chain length between C8 and C22 in which the acid chain can be saturated or unsaturated, linear or branched. The procedure can use a combination of fatty acids from different sources.