Zobrazeno 1 - 8
of 8
pro vyhledávání: '"Raphael I. Ngochindo"'
Publikováno v:
Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences. 63:48-54
Active metabolites of methanol, ethanol, ethyl acetate and aqueous extracts of the leaves of Andrographis paniculata were identified using thin layer chromatography and gas chromatography-mass spectrometry (GC-MS). Results from this study identified
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8180b3c285886f2478c139987b94335
https://doi.org/10.52763/pjsir.phys.sci.63.1.2020.48.54
https://doi.org/10.52763/pjsir.phys.sci.63.1.2020.48.54
Autor:
Raphael I Ngochindo
Publikováno v:
Proceedings / Indian Academy of Sciences. 104:377-382
Benzaldehyde is shown to be a more suitable electrophile than carbon dioxide in reactions involving the lithio derivatives of 2-(N-methylpyrrol-2-yl) oxazolines. The relative reactivities of the C3-Li and C5-Li bonds in ethereal solvents are examined
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a539f6714c1acbe5204f985a1af83ca2
https://doi.org/10.1007/bf02839547
https://doi.org/10.1007/bf02839547
Autor:
Raphael I. Ngochindo
Publikováno v:
Proceedings / Indian Academy of Sciences. 104:21-26
The importance of the imidazole nucleus is briefly outlined and some naturally occurring derivatives listed. The problem associated with direct alkylation on the imino nitrogen is discussed and synthesis of 1-alkyl derivatives by the thermal decarbox
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d88f4eaed96a3a4f538be2d1885bcf3
https://doi.org/10.1007/bf02843522
https://doi.org/10.1007/bf02843522
Autor:
Raphael I. Ngochindo
Publikováno v:
ChemInform. 21
Various substituents have been examined as possible 2-protecting groups against organolithium reagents in the syntheses of imidazoles on the basis of the ease of decarboxylation of imidazole-2-carboxylic acids and cleavage of the C(2)–Si bond. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08bb0dfe4870375987112c31b85a27ea
https://doi.org/10.1002/chin.199038212
https://doi.org/10.1002/chin.199038212
Autor:
Brian Iddon, Raphael I. Ngochindo
Publikováno v:
HETEROCYCLES. 38:2487
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3e3b21ee0cebe8a32e5f6ff241e872e
https://doi.org/10.3987/rev-94-465
https://doi.org/10.3987/rev-94-465
Autor:
Raphael I. Ngochindo
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :1645
Various substituents have been examined as possible 2-protecting groups against organolithium reagents in the syntheses of imidazoles on the basis of the ease of decarboxylation of imidazole-2-carboxylic acids and cleavage of the C(2)–Si bond. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::941cff9efa120367f0c2b86cce01de83
https://doi.org/10.1039/p19900001645
https://doi.org/10.1039/p19900001645
Publikováno v:
J. Chem. Soc., Perkin Trans. 1. :1343-1347
The effects of change of solvent and reaction time, of addition of Li+-chelating agent, and, in some instances, of change of temperature and metallating agent, on the metallation of 2-(2-furyl)- and 2-(N-methylpyrrol-2-yl)oxazolines by alkyl-lithium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4792a244e80b0faf405e6d0a716bc828
https://doi.org/10.1039/p19820001343
https://doi.org/10.1039/p19820001343
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :481
The conditions previously established for the dilithiation of 1-methylimidazole are shown to be applicable to 1-methoxymethyl- and 1-triphenylmethyl-imidazole allowing good-yielding syntheses of 1,2,5-trisubstituted imidazole derivatives. The suitabi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29059d25e0fbd9f31ea075315ade6cea
https://doi.org/10.1039/p19840000481
https://doi.org/10.1039/p19840000481