Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Do Young Ra"'
Publikováno v:
Journal of Inclusion Phenomena and Macrocyclic Chemistry. 37:359-370
A series of calix[4]arene-bis-crownethers were synthesized in a fixed 1,3-alternateconformation with good yields by the reaction of amonocyclic calixcrown ether with multi-ethyleneglycoldi-p-toluenesulfonate in the presence of cesiumcarbonate. In the
Autor:
Eun Tae Kim, Moon Hwan Cho, Won Ku Lee, Ill Yong Yu, Il Hwan Suh, Jin Hyun Pang, Do Young Ra, Jong-Kuk Kim, Jong Seung Kim
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :837-846
A series of 1,3-dialkyloxycalix[4]arene dibenzocrown ethers were synthesized in the fixed 1,3-alternate conformation with good yields by the reaction of 1,3-dialkyloxycalix[4]arenes with dibenzodimesylate in the presence of caesium carbonate. The thr
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :81-84
5-Amino-2,3-dihydro-1,2,4-oxadiazol-3-one 2 was synthesized as an analogue of cytosine. Among the possible four tautomers it was established by spectroscopic methods and ab initio calculations that it exists as a lactam form 2b like cytosine. The NH
Publikováno v:
Journal of Heterocyclic Chemistry. 35:1435-1439
5-Amino-2-acyl-1,2,4-thiadiazolin-3-ones 2–1 can be synthesized from 5-amino-2H-1,2,4-thiadiazolin-3-one (1–1) via a selective acylation with an acid anhydride in pyridine. The 1H nmr spectral characteristics of 5-amino-2-acyl-1,2,4-thiadiazolin-
Publikováno v:
Phosphorus, Sulfur, and Silicon and the Related Elements. 139:231-241
Fragment pathways of 3-alkyl and acyl-5-amino-1,3,4-thiadiazolin-2-ones were completely assigned by mass analyzed kinetic energy spectra (MIKE), collisional activated dissociation (CAD) spectra and high resolution mass spectra. [NH2CS]+ and [S[dbnd]C
Publikováno v:
Synthetic Communications. 28:2937-2944
1,3-diproyloxycalix[4]arene azacrown ether was successfully synthesized in the fixed 1,3-alternate conformation which was confirmed by a solid state structure.
Autor:
Won Ku Lee, Do Young Ra, Kune Woo Lee, Wang Kyu Choi, Yong-Ill Lee, Jong Seung Kim, Won Zin Oh
Publikováno v:
Microchemical Journal. 59:464-471
1,3-Alternate calix[4]arene crown-5 (1) and corresponding biscrown-5 (2) were synthesized and the complexation behavior with alkali metal ions examined. For both 1 and 2, potassium ion was selectively extracted from aqueous phase into organic phase o
Publikováno v:
Journal of Heterocyclic Chemistry. 35:525-530
Publikováno v:
Journal of Heterocyclic Chemistry. 33:1201-1206
Publikováno v:
ChemInform. 27
5-Amino-2H-1,2,4-thiadiazoline-3-one has been prepared from 2-thiobiuret through a oxidative cyclization under basic hydrogen peroxide condition. Lactam-lactim tautomerism of 5-amino-2H-1,2,4-thiadiazoline-3-one has been examined by spectroscopic met