Bis-trimethylsilylcefamandole: An unusually stable trimethylsilyl-intermediate.
نویسندگان
چکیده
منابع مشابه
Bis-trimethylsilylcefamandole: an unusually stable trimethylsilyl-intermediate.
The preparation of crystalline bis-trimethylsilylcefamandole (7) and its utility in the preparation and purification of cefamandole are described. Although stable to solvolysis in isopropyl alcohol, 7 underwent smooth conversion to cefamandole in the presence of water, methanol, or ethanol.
متن کاملOnconase: an unusually stable protein.
Several members of the RNase A superfamily are endowed with antitumor activity, showing selective cytotoxicity toward tumor cell lines. One of these is onconase, the smallest member of the superfamily, which at present is undergoing phase-III clinical trials as an antitumor drug. Our investigation focused on other interesting features of the enzyme, such as its unusually high denaturation tempe...
متن کاملIsolation and reactivity of an unusually stable organoselenenyl azide.
The stabilities of a series of isolated covalent selenium(II) azides such as [2-[1-(3,5-dimethylphenyl)-2-naphthyl]-4,5-dihydro-4,4-dimethyloxazole]selenium azide (2a), [2-(4,4-dimethyl-2-oxazolinyl)phenyl]selenenyl azide (3a), [o-(2,6-diisopropylphenyl-iminomethinyl)phenyl]selenenyl azide (4a), [o-(R)-(methylbenzyliminomethinyl)phenyl]selenenyl azide (5a) and o-formylphenylselenenyl azide (6a)...
متن کاملUnusually stable tungstenacyclobutadienes featuring an ONO trianionic pincer-type ligand.
This report presents the synthesis of the first neutral trianionic ONO pincer-type tungsten alkylidyne complex, [CF(3)-ONO]W≡C((t)Bu)(OEt(2)) (5) {where CF(3)-ONO = (MeC(6)H(3)[C(CF(3))(2)O])(2)N(3-)}. Treating 5 with 1-phenylpropyne, 4,4-dimethyl-2-pentyne, and cyclooctyne yields the corresponding tungstenacyclobutadiene complexes [CF(3)-ONO]W[κ(2)-C((t)Bu)C(Me)C(Ph)] (6), [CF(3)-ONO]W[κ(2)-C(...
متن کاملLancifodilactone G: insights about an unusually stable enol.
From quantum mechanics calculations we confirm that the naturally occurring enol lancifodilactone G is stable over the keto form (by 2.6 kcal/mol in water), the only known stable aliphatic enol (devoid of conjugated or bulky aromatics and lacking a 1,3-diketone structural motif known to stabilize enols). We determine architectural elements responsible for the enol stabilization and find a mecha...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of Antibiotics
سال: 1980
ISSN: 0021-8820,1881-1469
DOI: 10.7164/antibiotics.33.72