Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Ivan Veselý"'
Publikováno v:
Collection of Czechoslovak Chemical Communications. 61:1509-1519
New synthesis of intermediates for the preparation of prostaglandin analogs of the E1 series is described. The simple synthesis starts from commercially accessible Corey acetate 1 and makes use of simultaneous protection of the two hydroxy groups in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f68482496eff80cbf84db0310df4cd7c
https://doi.org/10.1135/cccc19961509
https://doi.org/10.1135/cccc19961509
Autor:
Jaroslav Paleček, Ivan Veselý
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:1242-1246
This paper describes a new synthesis of monomeric 2-/(2-methyl-2-propenoyl)oxy/ethyl esters of prostaglandins (IIa-IId). The monomeric esters were prepared by reaction of an alkali metal or triethylammonium salt of a prostaglandin of the F2a or A2 se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f3ce65459ae87e0886c9950afc4f0c2
https://doi.org/10.1135/cccc19951242
https://doi.org/10.1135/cccc19951242
Publikováno v:
Collection of Czechoslovak Chemical Communications. 57:357-361
The (-)-enantiomer of Corey lactone Ia has been separated from its (+)-enantiomer Ib via enantioselective esterification of the latter using glycerol tributyrate and catalytic amount of lipase from Candida cylindracea (EC 3.1.1.3) in an aprotic solve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f0943f0f0ce28976412f85772b02147
https://doi.org/10.1135/cccc19920357
https://doi.org/10.1135/cccc19920357
Publikováno v:
Collection of Czechoslovak Chemical Communications. 56:1690-1700
Racemic hydrogen butanedioates (IIa, IIb) and hydrogen pentanedioates (IIIa, IIIb), prepared by reaction of racemic Corey alcohols Ia, Ib with the corresponding acid anhydride, were resolved by optically active bases [(1R,2S)-(-)-ephedrine, (S)-(-)-1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1416492b1882eb93862aa62363327251
https://doi.org/10.1135/cccc19911690
https://doi.org/10.1135/cccc19911690
Autor:
Ivan Veselý
Publikováno v:
Geografie. 83:225-237
The territory investigated is situated in the middle part af the Czechoslovak Socialist Republic, approximately 20 km westward from the town of Olomouc. The geomorphological unit of the Bouzovská vrchovina (highland) is a component part of the Záb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf1f6c6e810f75e8f77ffbffca8c5fdc
https://doi.org/10.37040/geografie1978083040225
https://doi.org/10.37040/geografie1978083040225
Publikováno v:
Collection of Czechoslovak Chemical Communications. 52:1583-1588
PGF2α I and its synthetic analogs Cloprostenol II and Fluprostenol III form crystalline complexes with AgNO3. Application of these compounds to the production of pure prostaglandins is described. 1H and 13C NMR spectra are also discussed.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a43357e097231f5852e781a0b7b28f5f
https://doi.org/10.1135/cccc19871583
https://doi.org/10.1135/cccc19871583
Autor:
Ivan Veselý, Václav Dědek
Publikováno v:
Collection of Czechoslovak Chemical Communications. 50:1948-1958
Cleavage of 3,3,4-trifluoro-2,2-dimethyloxetane (I) in an aqueous solution of sulphuric acid, phosphoric acid, hydrogen chloride, or hydrogen bromide gave a mixture of 2,2-difluoro-3-methyl-3-butenal (II) and 5,5-difluoro-2-(1,1-difluoro-2-hydroxy-2-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::25d8ec3c937f10b18b69dccc45483c9b
https://doi.org/10.1135/cccc19851948
https://doi.org/10.1135/cccc19851948
Publikováno v:
Collection of Czechoslovak Chemical Communications. 54:1683-1686
Very convenient synthesis of Corey lactone–(3aα,4α,5β,6aα)-5-(1,1'-biphenyl-4-carbonyloxy)-hexahydro-4-hydroxymethyl-2H-cyclopenta[b]furan-2-one (VI) was developed. The title compound was obtained in five steps starting from 7-anti-hydroxymethy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b6547e14d149b20d972f39ada23a49b
https://doi.org/10.1135/cccc19891683
https://doi.org/10.1135/cccc19891683
Autor:
Václav Dědek, Ivan Veselý
Publikováno v:
Collection of Czechoslovak Chemical Communications. 50:2730-2742
Addition of nucleophiles to 2,2-difluoro-3-methyl-3-butenal (I) is complicated by its spontaneous polymerization. Compound I afforded neither hydrate nor dimethyl acetal but reacted with ethylene glycol to give the cyclic acetal II. Reaction with ace
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1bb3c5dc1aef1fa316cd168b44c6b0c
https://doi.org/10.1135/cccc19852730
https://doi.org/10.1135/cccc19852730
Publikováno v:
Earth and Planetary Science Letters. 5:153-158
The results of 7 temperature measurements repeated in bore hole MB-5A have been analyzed, and the character of the disturbance of the natural temperature field during hole boring has been studied. The results make it possible to determine the heat tr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfd6e37754c3e3c95675f6a2acc18da8
https://doi.org/10.1016/s0012-821x(68)80032-9
https://doi.org/10.1016/s0012-821x(68)80032-9