Výsledky vyhledávání - "J. Z. BRZEZINSKI"

A New, Improved and Convenient Synthesis of 4H-Cyclopenta[2,1-b:3,4-b′]-dithiophen-4-one

Autor: J. Z. Brzezinski, John R. Reynolds

Publikováno v: Synthesis. 2002:1053-1056

A new and efficient three-step synthesis of 4H-cyclopenta[2,1-b:3,4-b']dithiophen--4-one (CDT) (1) is described. This was achieved by a one-pot, regiospecific synthesis of bis(2-iodo-3-thienyl)methanol (13), its subsequent oxidation to the bis(2-iodo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eecf93508739e4a900403ea4547778a1
https://doi.org/10.1055/s-2002-31958

Zobrazit plný text záznamu

Application of Organolithium and Related Reagents in Synthesis. Part 221. Synthetic Strategies Based on Ortho-Aromatic Metallation. A Concise Regiospecific Conversion of Benzoic Acids into the 4-Pyridyl-2H-Phthalazin-1-Ones

Autor: J. Z. Brzezinski, A. Lajszczak, Zbigniew Malinowski, Jan Epsztajn, A. D. Bakalarz

Publikováno v: Synthetic Communications. 29:457-473

The synthesis of phthalazin-1-ones 6, 7, 8 via the reaction of 3-hydroxyisoindolin-l-ones 3, 4, 5 with hydrazine hydrate is described. Starting compounds 3, 4, 5 were regiospecifically prepared upon the lithiation (n-BuLi) of the benzanilides 1 and s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d1c2075dbf722befb14b0d2645915564
https://doi.org/10.1080/00397919908085788

Zobrazit plný text záznamu

Some remarks on the 𝑎𝑏𝑐-conjecture

Autor: J. Browkin, J. Z. Brzezinski

Publikováno v: Mathematics of Computation. 62:931-939

Let r ( x ) r(x) be the product of all distinct primes dividing a nonzero integer x . The abc-conjecture says that if a, b, c are nonzero relatively prime integers such that a + b + c = 0 a + b + c = 0 , then the biggest limit point of the numbers \[

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39fd54fd39e5390f53d62ab9b2c30003
https://doi.org/10.1090/s0025-5718-1994-1218341-2

Zobrazit plný text záznamu

Application of organolithium and related reagents in synthesis, Part XII. Synthesis of phenyl- and pyridylpyridopyridazinones and their derivatives

Autor: K. Czech, Jan Epsztajn, J. Z. Brzezinski

Publikováno v: Monatshefte für Chemie Chemical Monthly. 124:549-558

The preparation of the pyridazinones10a,10b,11a,11b, and12a,12b from the ketoamides7,8, and9 and hydrazine hydrate is described. It was found that from ketoamides8b and9b in addition to the expected pyridopyridazinones11b and12b also aminopyridopyrid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::439ed395a4e87c8761ee1538aa08cd50
https://doi.org/10.1007/bf00819523

Zobrazit plný text záznamu

ChemInform Abstract: Application of Organolithium and Related Reagents in Synthesis. Part 12. Synthesis of Phenyl- and Pyridylpyridopyridazinones and Their Derivatives

Autor: J. Z. Brzezinski, K. Czech, Jan Epsztajn

Publikováno v: ChemInform. 24

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::540455780872ad0beebd8e0d30339863
https://doi.org/10.1002/chin.199343153

Zobrazit plný text záznamu

ChemInform Abstract: A Concise Regioselective Synthesis of Hydroxyazaisoindolinones and Their Conversion into Pyridopyridazinones

Autor: Henryk B. Bzowski, J. Z. Brzezinski, Jan Epsztajn

Publikováno v: ChemInform. 27

The synthesis of pyridopyridazinones 7 and 8 via the reaction of hydroxyazaisoindolinones 5 and 6 with hydrazine hydrate is described. Compounds 7 and 8 were then subjected to reactions with alkyl halides to furnish N-alkyl derivatives. Only in the r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::840338bd0a2941329d592cc459aaf153
https://doi.org/10.1002/chin.199625144

Zobrazit plný text záznamu