Reference

Preparation of 5,6-dihydro-3H-pyrimidin-4-one derivatives

Preparation of 5,6-dihydro-3H-pyrimidin-4-one derivatives. Bhattacharya, Apurba; Allen, Diane E. (Hoechst Celanese Corp., USA). PCT Int. Appl. WO 9728132 A1 7 Aug 1997, 29 pp. DESIGNATED STATES: W: CN, JP; RW: AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE. (English). (World Intellectual Property Organization). CODEN: PIXXD2.Several substances like 1769-24-0 may be metioned in this study. CLASS: ICM: C07D239-22. APPLICATION: WO 1997-US1860 30 Jan 1997. PRIORITY: US 1996-595885 5 Feb 1996.Some commonly used reagents like 1769-24-0 is used in this experiment. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) 5,6-Dihydro-3H-pyrimidin-4-one derivs. were prepd. by (a) dehydrating N-acyl b-amino acid derivs. in the presence of a dehydrating agent and an org. solvent to form oxazones; (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazones to form a mixt.; (c) distg. azeotropically said mixt. to remove the dehydrating agent and org. solvent; and (d) heating the product of step (c). Thus, 2-acetylamino-4,5-dimethylbenzoic acid (prepn. given) was refluxed 3 h with Ac2O and heptane; NH4OAc was added followed by distn. of heptane, addn. of AcOH, continued distn., and reflux for 12 h to give 80% 2,6,7-trimethyl-4(3H)-quinazolinone. ..

Phase Equilibria in the Systems Hexane + Heptane and Methyl 1,1-Dimethylethyl Ether + Hexane + Heptane

Phase Equilibria in the Systems Hexane + Heptane and Methyl 1,1-Dimethylethyl Ether + Hexane + Heptane. Wisniak, Jaime; Magen, Erez; Shachar, Michal; Zeroni, Ilan; Reich, Ricardo; Segura, Hugo (Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel). Journal of Chemical and Engineering Data, 42(3), 458-462 (English) 1997 American Chemical Society. CODEN: JCEAAX. ISSN: 0021-9568. DOCUMENT TYPE: Journal CA Section: 68 (Phase Equilibriums, Chemical Equilibriums, and Solutions) Vapor-liq. equil. at 94 kPa has been detd. for the systems hexane + heptane and Me 1,1-dimethylethyl ether (MTBE) + hexane + heptane. The binary system exhibits regular, almost ideal behavior, and no azeotrope is present in the ternary system. The data were correlated by the Redlich-Kister, NRTL, Wilson, UNIQUAC, and Wisniak-Tamir equations and the appropriate parameters are reported. The models allow prediction of the activity coeffs. of the ternary system from those of the pertinent binary systems.