DERIVATIVES OF BENZOFURAN-2-ONES, STABILIZED COMPOSITION, METHOD OF STABILIZATION, DERIVATIVES OF MANDELIC ACID AND METHOD OF THEIR SYNTHESIS Russian patent published in 1999 - IPC

FIELD: organic chemistry. SUBSTANCE: invention relates to new derivatives of benzofuran-2-ones of the formula (I) where value of substituents is indicated in p. 1 of the invention claims. Compounds can be used as stabilizing agents of organic polymers subjected for oxidative, thermic or light-induced decomposition. Invention describes also the stabilized compositions on the basis of the compound of the formula (I) and a method of stabilization of an organic material using the compound of the formula (I). Invention describes also a method of synthesis of compounds of the formula (I). EFFECT: new compounds, improved method of synthesis. 23 cl, 4 tbl, 15 ex