2-?thyl-4-pyridinthions?ureamid

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Warfarin [3- (1-phenyl-2-acetyl) -?thyl-4-hydroxycumarin ]

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Das polarographische Verhalten von 2-?thyl-4-thiocarbamoylpyridin

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3-Äthyl-3-phenylpiperidindion-(2,4) und 3-Äthyl-3-phenylpyrrolidindion-(2,4) aus α-Phenylacetessigester

Zusammenfassung -Äthyl--phenylacetessigester (I) wurde bromiert, der resultierende -Bromacetylphenylbuttersäureester (II) mit NaBH₄ zum Bromhydrin (III) reduziert. Umsetzung mit KCN lieferte den -Cyan--hydroxy--phenyl--äthylbuttersäureester (IV), der in Gegenwart vonRaney-Ni zu den beiden stereoisomeren 3-Äthyl-3-phenyl-4-hydroxypiperidonen-(2) (Va) und (Vb) reduziert wurde. Oxydation von (Vb) mit CrO₃ lieferte das 3-Äthyl-3-phenylpiperidindion-(2,4) (VI).     

Synthèse des 1 -pyrazolyl,isoxazolyl et 1,2,3-triazolylméthyl-1,5-benzodiazépines par cycloaddition dipolaire-1,3

A one pot synthetic approach to the novel pyrazolyl, isoxazolyl and 1,2,3-(triazolyl)methyl-1,5-benzodiazepine system, by 1,3-dipolar cycloaddition of nitrilimines, benzonitriloxides and benzylazide to 1-propargyl-4-phenyl-1,5-benzodiazepin-2-one, is described. The structures of the obtained adducts have been assigned by means of spectroscopic measurements.     

Über das analytische Verhalten der Psychopharmaka 2-Phenyl-2-äthyl-4-hydroxymethyl-1,3-dioxolan und 2-Methyl-2- (p-chlor-phenyl) -4-hydroxymethyl-1,3-dioxolan

Analytical and Bioanalytical Chemistry -     

Zur Identifizierung von 5-Isoamyl-5-?thylbarbiturs?ure (Amylobarbitur) und des Mononatriumsalzes der 5-?thyl-5-(1-methylbutyl-barbiturs?ure) (Pentobarbitonnatrium, Nembutal) nebeneinander

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Synthesis and Crystal Structure of cis - 1,2- Dicy ano- 1,2- b is（ 2- me thyl- 4-bromo-3-thienyl）ethane

The title compound cis-1,2-dicyano-1,2-bis（2-methyl-4-bromo-3-thienyl）ethane has been synthesized and structurally characterized by X-ray single-crystal diffraction method. Crystal data： triclinic, space group P1^1, Z = 2, C14H8Br2N2S2, Mr = 428.16, a = 6.9410（5）, b = 11.0150（9）, c = 11.1760（8） A, α = 70.3390（10）,β = 76.1860（10）, γ = 79.5490（10）°, V= 776.59（10） A^3, Dc = 1.831 g/cm^3, μ（MoKα） = 5.478 mm^-1, F（000） = 416, R = 0.0487 and wR = 0.1453 for 2456 observed reflections with I 〉 2σ（/）. X-ray analysis reveals that the two thiophene rings are significantly twisted with an average dihedral angle of 57.45°. The molecule adopts a photo-active antiparaUel conformation and the distance between the two reactive C atoms of thiophene rings is 3.465（8）A. These structural elements which exhibit a suitable geometry are extensively explored for photochromic behavior in the crystalline state.     

Synthèse de nouvelles 7 (5)-〚benzimidazol-2-yl〛méthyl-2 (7)-méthyl-1,2,4-triazolo〚1,5-a〛(〚4,3-a〛)pyrimidines

Condensation of 4-hydroxy-6-methyl pyran-2-one 2 with 3-amino-1,2,4-triazole 1 in refluxing alcohol afforded 5-alkoxycarbonylmethyl-7-methyl-1,2,4-triazolo〚1,5-a〛pyrimidines and their isomers 5-alkoxycarbonylmethyl-7-methyl-1,2,4-triazolo〚4,3,-a〛pyrimidines 4. Reaction of hydrazine hydrate with compounds 4 and 5 yielded the corresponding hydrazid acids 6 and 7. Condensation of o-phenylenediamines 8 with esters 3(4) in refluxing xylol or with hydrazid acid 6(7) by melting reagents afforded 7(5)-〚benzimidazol-2-yl〛methyl-5(7)methyl-1,2,4-triazolo〚1,5-a〛(〚4,3-a〛)pyrimidines 9(10). The structures of the annealed compounds have been elucidated by their ¹H, ¹³C NMR and Mass Spectroscopy data.     

Synthèse des 2-hydroxy-7-〚benzimidazol-2-yl〛-méthyl-5-méthylpyrazolo〚1,5-a〛pyrimidines à partir de la 4-hydroxy-6-méthylpyran-2-one

Condensation of 3-amino-5-hydroxypyrazole 1 with triacetic acid lactone 2 in refluxed alcohols afforded 2-hydroxy-5,7-dimethylpyrazolo〚1,5-a〛pyrimidine 3 beside to 7-alkoxycarbonylmethyl-2-hydroxy-5- methylpyrazolo〚1,5-a〛pyrimidine 4. Action of hydrazine on compounds 4 yielded 7-hydrazinocarbonylmethyl-2-hydroxy-5-methylpyrazolo〚1,5-a〛pyrimidine 5. Condensation of o-phenylenediamines 6 with hydrazide 5 to melting reactants afforded 2-hydroxy-7-〚benzimidazol-2-yl〛methyl-5-methylpyrazolo〚1,5-a〛pyrimidines 7. Structures of the obtained products have been assigned by means of spectroscopic measurements.     

1-氯-3-硝基-2-丁烯与2-硝基丙烷钠盐的SRN1反应

本文研究了1-氯-3-硝基-2-丁烯与2-硝基丙烷钠盐的SRN1反应, 结果表明这种开链状纯脂肪族烯丙基型化合物发生了不重排的SRN1反应.     

2-硝基-1-萘酚的合成

以过氧化氢为氧化剂,在碱性条件下氧化2-亚硝基-1-萘酚合成了2-硝基-1-萘酚,优化了反应条件,改进了分离方法,产品收率达到70%以上.     

Solubility of Oxygen in Some 1-1, 2-1, 1-2, and 2-2 Electrolytes as a Function of Concentration at 25°C

The solubility of oxygen has been measured in a number of electrolytes [(LiCl, KCl, RbCl, CsCl, NaF, NaBr, NaI, NaNO₃, KBr, KI, KNO₃, CaCl₂, SrCl₂, BaCl₂, Li₂SO₄, K₂SO₄, Mn(NO₃)₃)] as a function of concentration at 25°C. The solubilities, mol (kg-H₂O)^–1, have been fitted to a function of the molality m (standard deviation < 3mol-kg^–1)

Cétonisation catalytique du méthyl-2-butène-3-ol-2 par des complexes du rhodium(III) ou du palladium(II)

A number of efficient catalytic procedures for the oxidation of acid-sensitive substrate such as 2-methyl-3-buten-2-ol to the corresponding ketone (2-methylbutan-2-ol-3-one) are compared. Reaction with dioxygen (or quinone) and a palladium precursor (PdCl₂ or [PdCl(NO₂)(CH₃CN)₂]) under mild conditions (⋍ 35°C), gave good conversions (⋍ 98%) and good selectivities (⋍ 90%).     

Synthesis of 2-(3-hydroxy-2-methyl-1-alkenyl)-1-pyrrolines and 2-(3-hydroxybutyl)-1-pyrroline using α-lithiated 2-methyl-1-pyrroline

Condensation of 2-methyl-1-pyrroline with chloroacetone or 3-chloro-2-butanone using LDA in THF afforded novel 2-(3-hydroxy-2-methyl-1-alkenyl)-1-pyrrolines via a peculiar reaction mechanism instead of the anticipated 2-(3-oxobutyl)-1-pyrrolines. The intermediacy of 2-(2,3-epoxy-2-methylalkyl)-1-pyrrolines in the latter transformation was demonstrated by immediate reductive epoxide ring opening utilizing lithium aluminium hydride in diethyl ether. Furthermore, 2-(3-oxobutyl)-1-pyrroline was prepared via an alternative approach through alkylation of 2-methyl-1-pyrroline with 3-chloro-2-(methoxymethyloxy)-1-propene using LDA in THF, followed by acid hydrolysis. Reduction of 2-(3-oxobutyl)-1-pyrroline by sodium borohydride in methanol afforded the corresponding 2-(3-hydroxybutyl)-1-pyrroline in good yield.     

Das Amid der 2-?thyl-4-pyridinthions?ure (Trecator Theraplix und ?tina VEB Leuna-Werke)

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