N-Methyl-4- -pyridinium

C17H26CIN, 1 -(1-PhenylcyclohexyDpiperidine hydrochloride, 35B, 176 ClsHisNsNi, 1,2-Bis(N-methyl-4-pyridinium)ethylene tetracyanonickel-ate(II), 35B, 177... 

N-methyl-4-pyridinium)-porphyrinato zine (II) triehloride 5-[4-Azidophenyl]-10,15,20-tri-(JV-methyl-4-pyridinium)porphyr-inato zinc (II) trichloride Benzoporphyrin derivative (BPD) 8.0... 

In 1982 a number of young people in California injected themselves with an illegally manufactured opiate drug that was subsequently found contaminated with N-methyl-4-phenyltetrahydropyridine (MPTP). Within a few days they developed irreversible symptoms of Parkinson disease. Subsequent investigation revealed that MPTP itself is not toxic but that it is oxidized by monoamine oxidase B (MAO-B) to the corresponding pyridinium derivative MPP+ (Eq. 30-4). It is this pyridinium derivative, or perhaps... 

An analogous cation radical chain process has been proposed for cis to trans isomerization of N-methyl-4-(6-stryl)-pyridinium ions via electron-transfer sensitization by Ru(bpy)-j2+ and metalloporphyrins (145). Quantum yields for isomerization are substantially higher in aqueous anionic micelles versus homogeneous solution due to the higher concentration of cis-styrylpyridinium ions. A radical cation chain mechanism may also account for previous reports of selective cis to trans sensitized photoisomerization of stilbene (25,26). 

Since their early studies Eley et al. (1959) (see Eley, 1967) have largely confined their attentions to the study of the electronic and structural properties of bipyridinium2+ (TCNQ)2" and related complexes (Ashwell et al., 1975a, b, c Ashwell et al., 1977a, b, c Eley et al., 1977). Most complexes, such as 4,4-bipyridyl (TCNQ)2, five (N,N-dialkyl-4,4 -bipyridylium)2+ (TCNQ)J+ salts (alkyl = methyl, ethyl, propyl, isopropyl and benzyl ), and l,2-di(N-ethyl-4-pyridinium) ethylene2+ (TCNQ), are low gap semiconductors except one form of the last compound which exhibited metallic behaviour. The asterisked complexes comprise planar sheets of TCNQ molecules grouped in tetrads. 

The clearest instances of contact charging by ion transfer are exhibited by ionomers, e.g. poly(styrene-co-N-methyl-4-vinyl-pyridinium toluenesulphonate),... 

Fig. 7.19 Graph of charge-to-mass ratio versus ionic content for particles of a blend of styrene-co-N-methyl-4-vinyl-pyridinium toluenesulphonate iono-mer with a styrene-co-butyl methacrylate copolymer, charged by rolling with coated beads. Reprinted with permission from Diaz et al. (1992). Copyright of the American Chemical Society.

Os(NH3)5(LH)] , where = pyridinium, JV-methylpyridinium, lutidinium, or N-methyl-4-picolinium, all of which are i/ -bonded, are fluxional. The N-methylpyridinium complex loses the tran -ammonia ligand relatively easily, through an 17 -intermediate, with a half-life of a matter of hours at ambient temperatures. " The rate constant for arene — alkyne bonded isomerization for (42) on [Os(NH3)5] is 1.8 x at 20 °C, which is two or three orders of... 

TMPyP (TPPS=tetra-(4-sulfonato-phenyl)porphinato TMPy = meso-tetrakis(N-methyl-4-pyridyl)-porphyrinato TMPyP = tetrakis-(l-methyl-pyridinium-4-yl)porphyrin)) (73,74), and Por, a highly negatively charged substituted model (i04), are consistent with the general trend observed for the nonheme species. The results are encouraging, suggesting that a common reactivity picture holds for the nonheme and heme-metaUonitrosyls. 

These conditions were met using as a reaction probe of the inner aqueous compartment of (DODA)X vesicles the alkaline hydrolysis of N-methyl-4-cyanopyridinium ion (MCP). The alkaline hydrolysis of N-alkyl-4-cyano-pyridinium ions (RCP) produces two products N-alkyl-4-pyridone (P) and N-alkyl-4-carboxamido pyridinium ion (A) (Scheme 3) [43]. The limiting P/A ratio in water is... 

Other Names 4-[p-(Dimethylamino)styryl]-l-methyl-pyridinium iodide Pyridinium, 4-[2-[4-(dimethylamino) phenyl]ethenyl]-l-methyl-, iodide Pyridinium, 4-[p-(di-methylamino)styryl] -1 -methyl-, iodide 4- [2- [4-(Dimethy-lamino)phenyl]ethenyl]-l-methylpyridinium iodide 4-[4-(Dimethylamino)-a-styryl]-1 -methylpyridinium iodide 4- [4-(Dimethylamino)styryl]-1 -methylpyridinium iodide 4- [4- (Dimethylamino) styryl] -A-methylp3nidinium iodide 4 -Dimethylamino-l-methylstilbazolium iodide 4 -Di-methylamino-N-methyl-4-stilbazolium iodide D 288 ... 

Radicals from N-methyl-4-carbamido-pyridinium -b COJ reaction. 

The solid state structures of anhydro-(3-methy - and 3-phenyl-2-hydroxy-4-oxo-47/-pyrido[l,2-n]pyridinium)hydroxides, 2-methoxy-3-methyl-47/-and 2-(2-pyridylamino)-47/-pyrido[l, 2-n]pyrimidin-4-ones were established by X-ray diffraction analysis. The amide type N(5)-C(4)-0 bonds are unusually long (144-149 pm) showing no sign of an amide type conjugation. 

AW, Acid-washed Choi, Cholesterol DMAP, 4-(Dimethylamino)pyridine DMF, N,/V-Dimethylformamide DMTr, Di(p-niethoxyphenyl)phenyl methyl GalNAc, N-Acetylgalactosamine, 2-acetamido-2-deoxy-D-galactose HMF, 5-Hydroxymethylfur-fural, 5-(hydroxymethyl)-2-furaldehyde INOC, Intramolecular nitrile oxide-alkene cycloaddition Lea, Lewisa Lex, Lewisx MOM, Methoxymethyl MP, p-Methoxyphe-nyl MS, Molecular sieves NIS, N-Iodosuccinimide PCC, Pyridinium chlorochromate PDC, Pyridinium dichromate PMA, Phosphomolybdic acid PMB, p-Methoxybenzyl ... 

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