Reference

Pyrazinecarboxylic acid derivatives

Pyrazinecarboxylic acid derivatives. (Kyushin Seiyaku Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 60048987 A2 16 Mar 1985 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C07D405-12. ICS: A61K031-495. APPLICATION: JP 83-154910 26 Aug 1983. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Section cross-reference(s): 1 Pyrazinecarboxylic acid derivs. I (R, R1, n = Me, H, O; H, Me, O; Me, H, 1; H, Me, 1) were prepd. by reaction of II with a-tocopherol (III). Serum cholesterol-lowering data of I were shown in rats (more potent than a-tocopheryl nicotinate). Thus, 10.2 g DCC in CH2Cl2 was added to a mixt. of II (R = Me, R1 = H, n = 0) 5, III 16.1, and (dimethylamino)pyridine 6.1 g in CH2Cl2 at 0° to give 15.3 g I (R = Me, R1 = H, n = O).

2-Pyrazinecarboxylic acid complexes of lanthanide ions

2-Pyrazinecarboxylic acid complexes of lanthanide ions. De Sa, G. F.; De B. Neto, B.; Ferreira, R. (Dep. Fis., Univ. Fed. Pernambuco, Recife, Brazil). Inorg. Chim. Acta, 23(2), 249-52 (English) 1977. CODEN: ICHAA3. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 73 The complexes formed in the reaction between the lanthanide basic carbonates and 2-pyrazinecarboxylic acid (Hpya) were prepd. and characterized. The compds. of formula [Ln(pya)3.xH2O], where x = 2 or 3, are solid cryst. substances. The new complexes were characterized by means of chem. analyses and vibrational and electronic absorption and emission spectra. The oscillator strengths of the hypersensitive transition 4I9/2 .fwdarw. 4G5/2, 2G7/2 of the Nd(III) complex were studied and the nephelauxetic effect was evaluated. The emission spectrum of the Eu(III) complex at 77 K was studied and the detn. of the max. obsd. splitting of the values of J indicates a very low site symmetry.