ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative study of neutral carriers in polymeric lithium ion selective electrodesV. P. Y. Gadzekpo, J. M. Hungerford, A. Kadry, Ibrahim, R. Xie, and Gary D. ChristianCite this: Anal. Chem. 1986, 58, 9, 1948–1953Publication Date (Print):August 1, 1986Publication History Published online1 May 2002Published inissue 1 August 1986https://pubs.acs.org/doi/10.1021/ac00122a007https://doi.org/10.1021/ac00122a007research-articleACS PublicationsRequest...

Abstract The facile synthetic approaches to 3‐pyridinecarbonitriles are described. first approach involves the base‐catalyzed transformation of 4‐hydroxy‐1,1‐cyclohexanedicarbonitrile 2a into 4a, b . other route multi‐step one‐pot reaction aryl methyl ketones with appropriate arylidenemalononitriles 6, 11a, Careful study synthesis 2a, from 1a, revealed importance controlling conditions. Thus, 1,7‐dioxo‐4,4‐heptanedicarbonitriles 3a, or 3‐pyridinecarbonitrile 4a were obtained in addition...

Abstract The reaction of diazomethane with 6‐phenyl‐3‐thioxo‐5‐oxo‐2,3,4,5‐tetrahydro‐1,2,4‐triazine 2a , and 6‐phenyl‐3‐methylmercapto‐5‐oxo‐4,5‐dihydro‐1,2‐triazine 3a effected N‐methylation to 2b 3b respectively. Compound 3‐methyl‐mercapto‐5, 6‐diphenyl‐1,2,4,‐triazine 4a react amines give 3‐N‐substituted‐amino‐triazines 5a–h 6a–h 3‐Mercapto‐5,6‐diphenyl‐1,2,4‐triazine 4b underwent S‐alkylation ethyl monobromoacetate tetra‐O‐acetyl‐α‐D‐glucopyraosyl bromide.

Abstract The action of hydrazine on 3,5‐dioxo‐4‐aryl‐2,3,4,5‐tetrahydro‐1,2,4‐triazines gave 4‐amino‐3,5‐dixo‐2,3,4,5‐tetrahydro‐1,2,4‐triazines. intermediates this reaction were isolated and shown to be α‐ketoacidhydra‐zide 4‐arylsemicarbazones not the α‐ketoanilidecarbohydrazones. realtive rates cyclization latter isomeric derivatives provide a support for proposed which in 3‐mercapto 3‐methylmercapto‐4‐aryl‐5‐oxo‐4,5‐dihydro‐1,2,4‐triazines with hydrazine.

4,6-Diphenyl-, 6-phenyl-4-p-tolyl- and 6-styryl-4-phenyl-3-thioxo-5-oxo-2,3,4,5-tetrahydro-1,2,4-triazines (1 a-c) react with tetra-0-acetyl-α-D-glucopyranosyl bromide (2) to give the corresponding 2-tetra-0-acetyl-B-D-glucopyranosyl derivatives (4a-c), respectively. Oxidation of 4a H 2 O gives 3,5-dioxo derivative (7). On other hand deacetylation affords 2-B-D-glucopyranosyl-4,6-diphenyl-3-thioxo-5-oxo-2,3,4,5-tetrahydro-1,2,4-triazine (8). Furfurylidene pyruvic acid condenses...

Abstract 3‐Phenoxy‐1‐propanols 1a–c and 3‐phenylsulfanyl‐1‐propanols 2a–c containing primary, secondary, tertiary alcohols were prepared subjected to gas‐phase pyrolysis in a static reaction system. Pyrolysis of 4‐phenyl‐1‐butanol 3 , 2‐methyl‐3‐phenyl‐1‐propanol 4 2‐methyl‐3‐phenylpropanoic acid 5 was also studied, results compared with those obtained for compounds 1–3 . The pyrolytic reactions homogeneous followed first‐order rate equation. Analysis the pyrolysate showed products be phenol...

1,3-Dipolar cycloaddition of nitrilimines to a variety 2-arylmethylidene-1-indanones 1 or 2-arylmethylidene-1,3-indandiones 5 gave the corresponding spiro[2H-indene-2,3′-[3H]pyrazol]-1(3H)-one 3 and their 1,3-dione derivatives 6 in high regioselectivity. The stereo-configuration (3'R, 4'S its enantiomeric form) was established by nOe-difference technique as well single crystal X-ray diffraction analysis.

Abstract Die Cyclokondensation der Triazinone (I) mit Anthranilsäure (II) führt zuvden Titelverbindungen (III), deren N‐Methylierung am Beispiel von (IIIa) bzw. (IIIb) die Verbindungen (VIa) (VIb) liefert.

Background: Up to 80% of men and 50% women will have androgenetic alopecia (AGA) at some point in their lives, making it the most prevalent kind hair loss. As a result actions dehydrotestosterone (DHT), testosterone metabolite, on androgen-sensitive follicles, width, length, color affected gradually decrease AGA. The arrector pili muscle is made up fusiform cells that don't cytoplasmic striations centralized, cigar-shaped nuclei. These muscles round follicle bulge area are linked an acute...

The phytochemical components of roasted kernel cashew nut (Anacadium ocidentale), its antioxidant and anti-hyperglycemic potentials were investigated via in vitro silico. was extracted 95 % methanol. Using boron trifloride (10 1-butanol), the extract derivatized sample analyzed using a Gas Chromatographic–Mass Spectrometry (GC-MS) method to establish chemical constituents. Antioxidant potential evaluated through 2, 2-diphenyl-1-picrylhydrazyl (DPPH•) 2,2′-azino-bis-(3-ethyl...

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 100 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”

Abstract Seven compounds of a new class ionophores, acyclic formazanes, were synthesized and tested for the potentiometric selectivity lithium ion, in polyvinyl chloride (PVC) membrane electrodes. Four different plasticizers studied: o ‐nitrophenyloctyl ether (NPOE), nitrophenylphenyl (NPPE), ‐nitrophenylbutyl (NPBE), ‐nitrophenylbenzyl (NPBnE), as was addition trioctylphosphine oxide (TOPO). The ionophore, 1, 5‐bis‐( ‐butoxyphenyl)−3‐cyanoformazane ( IIB ) exhibited sodium–lithium...

Five plastic membrane Pb2+-selective electrodes were prepared based on 1,4-bis(N-tosyl-o-aminophenoxy)butane I, 1,4-bis(N-allyl-N-tosyl-o-aminophenoxy)butane II, 1,4-bis(N-benzyl-N-tosyl-o-aminophenoxy)butane III, 1,4-bis[N-(o-allyloxybenzyl)-N-tosyl-o-aminophenoxy]butane IV, and 1,4-bis(N-octyl-N-tosyl-o-aminophenoxy)butane V as neutral carriers. The exhibited nearly Nernstian responses over the concentration ranges, 2.5×10−4–4.0×10−2, 2.5×10−5–4.0×10−2, 7.9×10−5–4.0×10−2,...

3-Hydrazinophenanthro[9,10-e]-1,2,4-triazine (2) was prepared and condensed with aromatic aldehydes to give the corresponding arylidene derivatives (3 a–f). Phenanthro-[9,10-e]-1,2,4-triazolo[4,5-b]-as-triazine (11), its 3-mercapto- (4 a), 3-alkylmercapto- (9 a–d) 3-hydroxy- (4b) were their structures have been established.

Abstract 1‐(2‐Methylindole‐3‐acetyl)4‐arylthiosemicarbazides have been prepared and were used as reagents for gravimetric colorimetric determinations of copper, cobalt, zinc mercury. The synthesis the same metal complexes these thiosemicarbazides a potential biological derivatives was also described.

Abstract 3-Sulfonylmethylquinoxalin-2(1H)-ones 2a,b were used for the synthesis of 2-thioxo 3a,b and 2–hydrazino 8a,b derivatives. The alkyl-thio derivatives 4–7 obtained from 3a,b. condensed or cyclocondensed with appropriate reagents to give hydrazones 9–11. triazolo[4,3-a]quinoxalines 13–16, tetrazolo[1,5-a]quinoxalines 17 triazino[4,3-a]quinoxalines 12. quinox-aiino[2,1-b]quinazoline 20 was 4a anthranilic acid.

The photochemical reactions of some azo derivatives substituted pyrazolin-5one were examined.Irradiation 4-arylazopyrazolin-5-one 1-3 gave the corresponding hydrazo 4-6 via reduction group and rearrangement pyrazolinone ring.The photo α-cleavage (-CO-N-Ph) in ring is suggested leading to formation a diradical component followed by cyclization give final products.

Abstract Das Chinazolindion (I) wird mit Hydrazin zu (II) gespalten und dann direkt zum N‐Amino‐Derivat (III) cyclisiert, das in schlechter Ausbeute auch aus (IV) erhalten werden kann.