Zobrazeno 1 - 5
of 5
pro vyhledávání: '"Jiří Ječný"'
Autor:
Eva Klinotová, Jiří Ječný, Jana Podlahová, Jaroslav Podlaha, Jiří Klinot, Miloš Buděšínský, Václav Křeček
Publikováno v:
Collection of Czechoslovak Chemical Communications. 56:2917-2935
3β-Acetoxy-21,22-dioxo-18α,19βH-ursan-28,20β-olide (IIIa) reacts with acetic anhydride in pyridine under very mild conditions affording β-lactone IVa and γ-lactones Va and VIIa as condensation products. On reaction with pyridine, lactones Va an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc997507e31905eef591f5a3dac1f8a4
https://doi.org/10.1135/cccc19912917
https://doi.org/10.1135/cccc19912917
Publikováno v:
Collection of Czechoslovak Chemical Communications. 55:1529-1534
The crystal and molecular structure of the title compound, C19H21NO5S, M = 375.44, was solved by X-ray structure analysis using diffractometer intensity measurement with CuKα radiation. The space group is P1, with lattice parameters a = 555.7(3), b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6205858bbdd56a1483d156b9df1fa0ad
https://doi.org/10.1135/cccc19901529
https://doi.org/10.1135/cccc19901529
Publikováno v:
J. Chem. Soc., Perkin Trans. 1. :3049-3052
Tetrazolo[1,5-a]quinoxaline-5-oxide 4 reacts with the carbanions of β-diketones and β-keto esters to give enaminoketones and enamino esters, respectively. The N-oxide 4 reacts with 3-methyl- and 3-ethyl-pentane-2,4-dione under similar conditions to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bdf90afb1d36ddec1eed7e06025823ef
https://doi.org/10.1039/p19900003049
https://doi.org/10.1039/p19900003049
Publikováno v:
Collection of Czechoslovak Chemical Communications. 55:2059-2065
Title compound is triclinic, Mr = 461.60; P1, a = 9.158(1), b = 16.062(3), c = 19.472(3) Å, α = 110.69(1)°, β = 89.70(1)°, γ = 103.17(1)°, V = 2 600(1) Å3, Z = 4, Do = 1.15(3), Dc = 1.179(1) Mg m-3, λ(CuKα) = 1.5418 Å, μ = 0.509 mm-1, F(0
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e74d81d177ab806b045f17c9bd29ed4
https://doi.org/10.1135/cccc19902059
https://doi.org/10.1135/cccc19902059
Publikováno v:
Collection of Czechoslovak Chemical Communications. 47:2403-2414
The title compound crystallizes in the monoclinic system, has the P21/c space group, and the unit cell parameters are a = 1 484.4(8), b = 1 522.8(8), c = 1 854.0(8) pm, β = 96.36(4)°, Z = 4. The structure consists of molecules of an electroneutral
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea7124cc5af91f4c2c6bb5e46cdd2d7e
https://doi.org/10.1135/cccc19822403
https://doi.org/10.1135/cccc19822403