Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Synthesis and Cyclization of N-{2-[(2-Carboxyethyl)sulfanylphenyl]}-beta-alanines

Rutkauskas K., Kantminiene K., Beresnevieius Z. J.

Polish Journal of Chemistry

2008

Vol. 82, nr 12

2341-2347

The reaction of methyl- and methoxyaminobenzenethiols with acrylic acid resulted in formation of 8-methyl- and 8-methoxy-2,3-dihydro-1,5-benzothiazepin-4(5H)-ones, N-{2-[(2-carboxyethyl)sulfanyl]-4-methylphenyl}-b-alanine and 3-[(8-methoxy- 4- oxo-3,4-dihydro-1,5-benzothiazepin-5(2H)-yl]propanoic acid. Their cyclization to N-(5-methyl-4-oxo-3,4-dihydro-2H-thiochromen-8-yl)-b-alanine, 5-methyl- 9,10- dihydro-2Hthiopyrano[3,2-h]quinoline-4,7(3H,8H)-dione and 10-methyl- 2,3,6,7- tetrahydro-4H,8H-[1,4]thiazepino[2,3,4-ij]quinoline-4,8-dione is described.

Synthesis o hexahydropyrimidine derivatives ad their polymer stabilising properties

Beresnevičius Z. J., Mickevičius V., Rutkauskas K., Kantminienë K.

Polish Journal of Chemical Technology

2003

Vol. 5, nr 3

75-81

Twenty nine l-aryldihydro-2,4(lH,3H)-pirimidinediones, their 2-thio analogues, and 5- and 6-methyl homologues were investigated as stabilisers of thermooxidative destruction. These derivatives of hexahydropyrimidine were synthesised by reaction of the corresponding N-aryl-, N-aryl-a-methyl- or N-aryl-b-methyl-b-alanines with carbamide or potassium rhodanide in acetic acid with the further addition of hydrochloric acid. It was determined, that l-(4-hydroxy-3,5-diisopropylphenyl)dihydro-2,4(lH,3H)-pyrimidinedione was the best stabiliser for poly(vinyl chloride). Low-density polyethylene was effectively stabilised by l-(4-phenylaminophenyl)dihydro-4(lH,3H)-pyrimidinone-2-thione. l-(l-Naphthyl)-, l-(2-naphthyl)- and l-(4-hydroxyphenyl)dihydro-4(lH,3H)-pyrimidinone-2-thiones were suitable stabilisers for polycaprolactam, polyamides PA 12 and PA 610. l-(Hydroxyphenyl)-6-methyldihydro-4(lH,3H)-pyrimidinone-2-thione was soluble in ethanol and therefore was suitable for stabilisation of polyamide by diffusion. l-(l-Naphthyl)- and l-(4-phenylaminophenyl)dihydro-4(lH,3H)-pyrimidinone-2-thiones were better stabilisers of polyacetals than NG 22-46 and other industrial stabilisers. Cellulose di- and triacetates were stabilised the best by l-(l-naphthyl)-5 (and 6)-methyldihydro-4(lH,3H)-pyrimidinone-2-thiones which were soluble in methylenechloride and acetone.