NOVELTY - Synthesizing alpha / alpha -alkoxylated glycerol linear carbonic esters, comprises contacting (i) an amount of a precursor consisting of cyclo-carbonates of alpha / alpha -alkoxylated glycerol (XXII), (ii) an amount of a catalyst consisting of metal oxides, metal alkoxides, Lewis acids, organo-metallic catalysts and inorganic bases, and (iii) an amount of at least one organic initiator consisting of alcohols, polyols and amino-alcohols at a temperature of 220 degrees C.    USE - The process is useful for synthesizing alpha / alpha -alkoxylated glycerol linear carbonic esters used in a composition (claimed) such as a liquid composition and for the production of biodiesel, where the carbonic esters are in the form of oligomer.    ADVANTAGE - The process allows simple, economical and large scale synthesis of alpha / alpha -alkoxylated glycerol linear carbonic esters without the use of a hydrocarbon solvent from toxic, fossil resource. The alpha / alpha -alkoxylated glycerol linear carbonic esters improve the rheological properties of the liquid composition.    DETAILED DESCRIPTION - Synthesizing alpha / alpha -alkoxylated glycerol linear carbonic esters, comprises contacting (i) an amount of a precursor consisting of cyclo-carbonates of alpha / alpha -alkoxylated glycerol of formula (XXII), (ii) an amount of a catalyst consisting of metal oxides, metal alkoxides, Lewis acids, organo-metallic catalysts and inorganic bases, and (iii) an amount of at least one organic initiator consisting of alcohols, polyols and amino-alcohols at a temperature of 220 degrees C.R4-R6 = H, or organic group containing at least two atoms linked by covalent bonds, where the atoms belong to the group consisting of C, H, O and N.    An INDEPENDENT CLAIM is included for alpha / alpha -alkoxylated glycerol linear carbonic esters compound of formula (M1-G1-C(=O)-O-Q1) (I) obtained by the process.    M1 = H, or organic group containing at least two atoms linked by covalent bonds, where the atoms belong to the group consisting of C, H, O and N;    Q1 = organic group (preferably -CH2-CH2-NH2) containing at least two atoms linked by covalent bonds, where the atoms belong to the group consisting of C, H, O and N; and    G1 = alpha/alpha-alkoxylated group of formula (-O-CH2-CH(CH2-O-CR4R5R6)-O-) (II).