METHOD OF PRODUCING N-SUBSTITUTED CARBAMIC ACID ESTER AND METHOD OF PRODUCING ISOCYANATE USING N-SUBSTITUTED CARBAMIC ACID ESTER Russian patent published in 2014 - IPC C07C269/04 C07C271/42 C07C271/44 C07C271/56 C07C271/58 C07C263/04 C07C265/14 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing at least one N-substituted carbamic acid-O-aryl ester (where said ester denotes an N-substituted carbamic acid ester in which oxygen atoms of the carbamic acid group (-NHCOO-) are bonded to an aromatic ring) from a compound of formula (1), having a ureido group, and aromatic hydroxy-compound of formula (2) or an aromatic hydroxy composition containing at least one type of aromatic hydroxy compound of formula (2). The method includes a step for esterification or esterification and re-esterification of a compound of formula (1) and an aromatic hydroxy compound or an aromatic hydroxy composition of formula (2). In formula (1), R¹ is an organic group containing a whole number of carbon atoms ranging from 1 to 85, which is substituted a times by ureido group(s), a is an integer from 1 to 10. In formula (2), the ring A is an aromatic group selected from a benzene or naphthalene ring which is substituted b times with OH groups, and can be substituted with at least one substitute selected from groups of substitutes (i)-(v), which retain aromatic properties of ring A, ring A and at least one substitute contain a whole number of carbon atoms ranging from 6 to 50, b is an integer from 1 to 2. The groups of substitutes (i)-(v) denote (i) a hydrogen atom; (ii) a group consisting of carbon and hydrogen atoms which can also form a ring structure by binding with ring A; (iii) a group consisting of carbon, hydrogen and oxygen atoms; (iv) a halogen atom; (v) a group consisting of atoms selected from carbon, hydrogen, oxygen, nitrogen, sulphur and halogen atoms, except groups containing a carbonyl, ester, carboxyl, terminal methine and alcohol OH groups, NH₂-, NH-, NOH-, SH-, SO₃H- and SOH- groups.

EFFECT: method enables to prevent formation of byproducts and reuse of starting substances; the invention also relates to different versions of the disclosed method, a composition for transportation and storage of a compound having a ureido group and a method of producing an isocyanate via thermal decomposition of an N-substituted carbamic acid-O-aryl ester.

22 cl, 26 dwg, 67 tbl, 306 ex