TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metallic catalyst comprises zinc sulfate, zinc stearate, iron sulfate, ferric phosphate, manganese sulfate, zinc oxide, calcium carbonate, sodium carbonate, potassium carbonate and sodium sulfate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method comprises mixing and heating the precursor, the catalyst and the organic primer in a closed gas-tight reactor to reach the reaction temperature and pressure, preferably autogenous pressure, which is greater than atmospheric pressure, determining leak gas composition to reduce the pressure in the reactor, maintaining the reaction temperature in the reactor for 5 minutes, and contacting the precursor, the catalyst and the organic primer at the reaction temperature for 5 minutes to 3 hours. Preferred Components: The precursor comprises 4-methyl-1, 3-dioxolan-2-one acetate, 4-methyl-1, 3-dioxolan-2-one n-propanoate, 4-methyl-1, 3-dioxolan-2-one n-butanoate, 4-methyl-1, 3-dioxolan-2-one 2-methyl-propanoate, 4-methyl-1, 3-dioxolan-2-one n-pentanoate, 4-methyl-1, 3-dioxolan-2-one 3-methyl-butanoate, 4-methyl-1, 3-dioxolan-2-one 2,2-dimethyl-propanoate, 4-methyl-1, 3-dioxolan-2-one n-hexanoate, 4-methyl-1, 3-dioxolan-2-one n-heptanoate, 4-methyl-1, 3-dioxolan-2-one n-octanoate, 4-methyl-1, 3-dioxolan-2-one n-nonanoate, 4-methyl-1, 3-dioxolan-2-one n-dodecanoate, 4-methyl-1, 3-dioxolan-2-one n-hexadecanoate, 4-methyl-1, 3-dioxolan-2-one n-heptadecanoate, 4-methyl-1, 3-dioxolan-2-one undec-2-ene-noate, 4-methyl-1, 3-dioxolan-2-one hexadec-9-ene-noate and 4-methyl-1, 3-dioxolan-2-one octadec-9-ene-noate. The organic composition comprises: linear carboxylic esters of a/a' acylglycerol of formula (M0-O-G0-O-C(=O)-O-Q0) (II); and carboxyl compound of formula (M2-O-G2-O-(C(=O)-O)x-Q2) (III).M0, M2 = H or organic moiety formed from at least two atoms of C, H and O linked by covalent bonds;Q0, Q2 = organic moiety formed from C, H and O linked by covalent bonds;G0, G2 = -CH2-CH(-CH2OH)- or -CH2-CH(CH2-O-C(=O)-R1); andx = 0 or 1. Preferred Definitions:    R1 = methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-octyl, undecyl, pentadecyl or heptadecyl.    EXAMPLE - 472 g of 4-hydroxymethyl-1,3-dioxolan-2-one was introduced in a three-necked glass reactor. 6 moles of Acetic anhydride was added dropwise into the reactor and the reactor was controlled and maintained at 50?oC under mechanical agitation of 800 revolutions per minute for 4 hours to obtain linear carboxylic esters of a/a' acylglycerol. The linear carboxylic esters of a/a' acylglycerol was heated at 160?oC for 2 hours in presence of metallic catalyst including 25 mg of zinc stearate to obtain corresponding oligomer compounds.