Methanol oxidation infrared spectra

Pentacarbonyl(methoxymethylcarbene)tungsten(0) is a dull-yellow, crystalline solid mp 52°. It is appreciably more stable thermally and oxidatively than its chromium analog in the solid state at room temperature and may be stored at 5° for a period of 1 or 2 weeks without significant decomposition. It is soluble in aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane, and other common laboratory solvents such as benzene, 1,4-dioxane, tetrahydrofuran, chloroform, dichloromethane, and methanol it is slightly soluble in ethanol. The infrared spectrum (cyclohexane solution) has v(CO) bands at 2075, 1980, 1960, and 1947 cm"1. The nmr spectrum in chloroform-d has the methoxy proton resonance at t6.17 and the methyl proton resonance at t7.69. Other physical properties are reported in the literature.6,7... 

Amino-6-chloropyridazine 2-oxide can be diazotized to give anhydro 3-diazo-6-hydroxyp3rridazine diazonium hydroxide 2-oxide (141) the structure is supported by infrared spectrum and conversion into 3-hydroxypyridazine 1-oxide on refluxing in methanol. - When coupled with 2-naphthol in alkaline medium, the diazonium compound gives a purple dye. ... 

The reaction of 5-amino-5-deoxy-l,2-0-isopropylidene-a-D-xylo-furanose (15) with methanolic hydrogen chloride (0.5 %), under careful exclusion of moisture, results in a mixture of the anomers of methyl 5-amino-5-deoxy-D-xylofuranoside, from which the /8-D anomer crystallizes. The five-membered ring-structure was proved by the results of periodate oxidation and by the infrared spectrum of the tetraacetate, which shows a band for NH. A methyl pyranoside was not found, and 3-pyridinol (21) was formed only in traces. A spontaneous ring-enlargement, such as is observed under similar conditions with 1,2-O-isopropylidene-5-thio-a-D-xylofuranose (see p. 208), is not possible in this instance. Stabilization as the methyl fiiranoside is, apparently, so rapid that the secondary reaction (leading to the pyranose form) does not occur. If water (several percent) is added to the reaction mixture, glycoside formation is hindered, and a large proportion of 3-pyridinol is formed. ... 

A variety of engineering polymers and copolymers can be prepared by reacting an aromatic ether dithiol (HS—C6H4OC6H4SH) which has just been stannylated [by reaction with bis(tri- -butyltin)oxide] with isophthaloyl chloride in dry chloroform. The polymer is precipitated from methanol and the infrared spectrum is consistent with the structure of the polymer [16a] as... 

The use of an infrared microscope enables the investigation of the surface of rather small electrodes. The resulting miniaturization of the necessary electrochemical cell allows its operation as a fiow cell in thin layer arrangement [242]. Combined with a rapid-scan FTIR spectrometer, acquisition of infrared spectra during electrode potential scans at a rate of d /dr = 200 mV-s are possible. The time resolution is equivalent to one complete spectrum recorded every 2.6 mV. The formation of various reaction intermediates of methanol oxidation in alkaline solution at a platinum electrode could be assigned to specific electrode potential ranges. 

Electrochemical infrared spectroscopy can be used on all kinds of electrodes and for all substances that are IR active. It is particularly useful for the identification of reaction intermediates, and has been used extensively for the elucidation of the mechanisms of technologically important reactions. A case in point is the oxidation of methanol on platinum, where linearly bonded = C = O (i.e., CO bonded to one Pt atom) has been identified as an intermediate Figs. 15.7 and 15.8 show EMIRS [6c] and IRRAS [8] spectra of this species. Near 2070 cm-1 the EMIRS spectrum shows the typical form produced by a peak that shifts with potential. This shift can be followed in the IRRAS spectrum... 

In-situ infrared (IR) study of DMC synthesis from the gas-solid oxidative carbonylation Figure 3 shows the IR spectrum of DMC synthesis from the oxidative carbonylation of methanol over 5 wt% CUCI2/HZSM-5. The IR intensity of DMC s carbonyl band at 1766 and 1789 cm was leveled off after 2 min of reaction. A 8.1% yield of DMC was achieved. The key adsorbates observed are Cu+(CO)Cl at 2080 cm and Cu2(CO)4Cl2 at 2052 cm. ... 

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