Results 21 to 30 of about 40,846 (271)
Carbon-13 n.m.r. investigation on the nitrogen methylation of the mono- and diazanaphthalenes [PDF]
, 1977 The 13C n.m.r. spectra of the N-methylated mono- and diazanaphthalenes have been recorded and analysed. It has been shown that N-methylation as well as N-protonation in cinnoline occur predominantly at the -nitrogen atom.
Ham, Dirk M.W. van den +2 more
core +2 more sources
Jurnal Kimia Sains dan Aplikasi, 2018 Isolation of alkaloid compounds from ethanol extract of red galangal rhizomes to compare their antibacterial properties with extracts formed into nanoparticles has been performed.
Vatara Artanta Silalahi +2 more
doaj +1 more source
Asymmetric Electrophilic alpha-Amidoalkylation, VII1): Generation, Crystal Structure, and Trapping Reactions of a Chiral 6,7-Dimethoxy-1,2,3,4-tetrahydroisoquinoline Derived N-Acyliminium Ion [PDF]
, 1990 The camphanic acid amide 4 has efficiently been oxidized with triphenylcarbenium tetrafluoroborate (3) to yield the chiral N-acyliminium ion 1. Trapping reactions of 1 with the silyl nucleophiles 7a-c and 10a-f proceeded with stereoselective bond ...
Aledesanmi +15 more
core +1 more source
Acta Crystallographica Section C Crystal Structure Communications, 2012 The title compound, C9H8N2, presents two almost identical independent molecules in the asymmetric unit, both of them exhibiting an extremely planar isoquinoline core (maximum r.m.s. deviation = 0.014 Å). The most significant deviation is found in the –NH2groups, which present a noticeable pyramidalization around the N atom, a feature also present in ...
Maria Atria, Ana +2 more
openaire +4 more sources
IUCrData, 2017 In the title compound, C23H23ClN2O4S, the 4-chlorophenyl ring is inclined to the pyridine ring of the isoquinoline group by 71.86 (13)°. In the crystal, molecules are linked by pairs of O—H...O hydrogen bonds, forming inversion dimers, which stack along ...
Joel T. Mague +4 more
doaj +1 more source
Inorganics, 2023 Four iridium(III) dyes functionalized with aldehyde functional group in the cyclometalating (C^N) ligands, bearing either diethyl [2,2′-bipyridine]-4,4′-dicarboxylate or tetraethyl [2,2′-bipyridine]-4,4′-diylbis(phosphonate) anchoring groups, coded as ...
Xiao Yao +6 more
doaj +1 more source
S-adenosyl-l-methionine: (S) -7,8,13, 14-tetrahydroberberine--n-methyltransferase, a branch point enzyme in the biosynthesis of benzophenanthridine and protopine alkaloids. [PDF]
, 1986 The enzyme which transfers the CH3-group of S-adenosylmethionine to the nitrogen atom of (S)-tetrahydroberberine and (S)-stylopine is found to occur in a number of plant cell cultures originating from species containing alkaloids; it is located at an ...
Amann +8 more
core +1 more source
Stable BF2 Boracycles as Versatile Reagents for Selective Ortho C–H Functionalization
Angewandte Chemie, EarlyView.We report a robust, metal‐free and scalable synthesis of stable BF2 boracycles via directed ortho CH borylation, delivering isolable, shelf‐stable reagents without chromatographic purification. These BF2 boracycles exhibit unique and tunable reactivity, enabling highly selective ipso‐functionalization across a broad range of transformations.
Ganesh H. Shinde +11 more
wiley +2 more sources
Marine Drugs, 2023 The mold Monascus, also called red yeast rice, anka, or koji, has been used as the natural food coloring agent and food additives for more than 1000 years in Asian countries. It has also been used in Chinese herbology and traditional Chinese medicine due
Ming-Der Wu +2 more
doaj +1 more source
Regioselective Reactions of Highly Substituted Arynes [PDF]
, 2010 The fully regioselective reactivity of four new highly substituted silyl aryl triflate aryne precursors in aryne acyl-alkylation, acyl-alkylation/condensation, and heteroannulation reactions is reported.
Bugga, Pradeep +4 more
core +2 more sources