Propanol results

Methyl 3,4,5,6-tetra-0-acetyl-2-deoxy-2-diazo-D-arabino-hexonate (84) has been irradiated in methanol and in 2-propanol.177 In methanol, the only photoproduct is the enol acetate 85 however, irradiation in 2-propanol results in formation of minor proportions (6%) of 85 and the alkene 86 (7%), but the major product is the deoxy sugar 87 (61%). The difference in reactivity of 84 in these two solvents is probably a reflection of the difference in the ability of methanol and 2-propanol to function as hydrogen donors when reacting with a carbene (see Scheme 31). In methanol, a 1,2-hydrogen atom shift to the divalent... 

Thin-layer chromatography of sorbitol has also been reported on silica gel plates impregnated with cupric ion [38]. The plates were impregnated with Cu(II) by immersing them into copper solutions. Developer solutions of distilled water, aqueous ethanol, or aqueous n-propanol resulted in good separation of sucrose and glucose. 

Charge alteration on the surfaces of nanosized metallic silver particles has been investigated by simultaneously monitoring absorption and conductivity changes during pulse-radiolytic experiments [506]. Pulse radiolysis of a nitrous-oxide-(N20) saturated aqueous solution of 3.0 nm diameter metallic silver particles containing 0.2 M 2-propanol resulted in electron injection to the colloid. NzO functions to double the yield of hydroxyl radicals ( OH) generated in water... 

The photocatalytic reduction of CO2 on the bare CdS particles suspended in acetonitrile in the presence of 2-propanol resulted in the formation of formate and carbon monoxide as the reduction products with a simultaneous production of H2 (Figure 1). As an oxidation product of 2-propanol, acetone was produced, and no other oxidation products were obtained. As shown in... 

The preparation of 19-iodocholesterol (24) by nucleophilic substitution of the neopentyl 19-tosyloxycholesterol (23) with Nal-propanol resulted in partial isomerization to 6j8-iodomethyl-19-norcholest-5(10)-en-3j8-ol (25), which could not be removed completely by crystallization. The pure 19-iodo-compound (24) was obtained by using the 3-acetate 19-tosylate of cholest-5-ene-3j8,19-diol for the substitution reaction, and was found to isomerize to the 6/8-iodomethyl compound... 

In the presence of palladium catalysts, depending on reaction conditions, the substrate can either be isomerized to propionic aldehyde or be hydrogenated to propanol. Results of allyl alcohol hydrogenation on polyvinylpyridine complexes of palladium and Pd black in water at 293 K are compared in Table 13. 

The chemical (Gif system) and the electrochemical conversion (Gif-Orsay system) have been compared in the oxidation of six saturated hydrocarbons (cyclohexane, 3-ethylpentane, methylcyclopentane, cis- and traus-decalin and adamantane). The results obtained for pyridine, acetone and pyridine-acetone were similar for both systems. Total or partial replacement of pyridine for acetone affects the selectivity for the secondary position and lowers the ratio ketone secondary alcohol. The formation of the same ratio of cis- and traws-decal-9-ol from either cis- or trans-deca in indicates that tertiary alcohols result from a mechanism essentially radical in nature. The C /C ratio between 6.5 and 32.7 rules out a radical mechanism for the formation of ketones and secondary alcohols. Ratios of 0.14 and 0.4 were reported for radical-type oxidations of adamantane and cis-decalin. Partial replacement of pyridine by methanol, ethanol or f-propanol results in diminished yields and a lower selectivity. Acetone gives comparable yields however, the C /C ratio drops to 0.2-10.7. 

A simple chemiresister setup was used this was composed of two metal electrodes, 1 cm apart, separated by the liquid deposited carbon nanotube network. The dimension of the network was 1 cm The density of SWNTS was approximately 2pm. A voltage of 100 mV was apphed between the two metal electrodes and current versus time data was recorded for each device. Exposure to saturated vapors of acetone, methanol and 2-propanol resulted in a decrease in current for all devices. The data presented in figure 4 has been plotted as AR/R in order to facilitate the comparison of various devices with differing initial resistances. 

The stability of the D-I-I complex and the cleavage of the I-I bond depend on the donor activity of the ligand and the solvent. The formation of a complex between I2 and three pentadentate Schiff bases, 1,3-bis (salicylideneamino)-2-propanol, 1,3-bis (2-hydroxy-l-naphthylideneamino)-2-propanol, and 1,3-bis [l-(pyridine-2-yl) methylideneamino]-2-propanol results only in polarization of the I-I bond [13]. The formation of a complex between pyridine and molecular iodine (I2) leads to the polarization of the I-I bond in some non-polar solvents such as liquid alkanes and is accompanied by cleavage of the I-I bond in low-density polyethylene [14]. 

Similarly irradiation of Pd(NH3)4Q2 in aqueous uo-propanol results in the reduction of the palladium complex to colloidal palladium by both solvated electrons and 1-hydroxy-1-methylethyl radicals (CH3)2COH (formed by reaction of iyo-propanol with the initial radiolysis products H and OH). [102] Since mixtures of acetone and iso-propanol also yield (CH3)2COH under both radiolytic and photolytic conditions, they have been used in many studies on the radical chemistry of metal colloids. In many of these studies, the techniques of flash photolysis and pulse radiolysis were used to detect short lived intermediates, measure the kinetics, and determine the mechanisms of metal cation reduction, nucleation, and colloidal cluster formation. 

The dispersion of chloroform and sodium hypochlorite is also used for the extraction of PHB. By this method, the degradation of PHB by sodium hypochlorite is slightly reduced but highly inconvenient for analytical purposes, which leads to improper data analysis. Extraction of PHB with a mixture of hexane and propanol resulted in poor recovery yield. 

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