Hydrate, preparation

Diethylamine, CH3CH2)2NH. B.p. 55-5°C. Forms a crystalline i hydrate. Prepared by the action of a boiling solution of sodium hydroxide on nitrosodielhylaniline. Forms crystalline compounds with many metallic chlorides. 

A solution of 20 mg of 25-hydroxychoiecaiciferoi hydrate, prepared as described above, in 20 mi of methyiene chioride is dried with 200 mg of anhydrous sodium suifate. The solution is fiitered and the fiitrate is evaporated to yield 25-hydroxycholecalciferol essentially anhydrous as an amorphous oil. 

All ester hydrates prepared were crystalline and can be stored without decomposition. 

Addition of water to carbonyl compounds acid-catalysed hydration. Preparation of diols... 

Stacey and Turton61 tried to produce the osone hydrate directly by oxidation of 2,3,4,6-tetra-0-acetyl-(2-hydroxy-D-glucal) with an ethereal solution of perbenzoic acid. A discrepancy exists in the constants reported for the specimens of 2,3,4,6-tetra-O-acetyl-D-glucosone hydrate prepared... 

The ideal stoichiometric formulas for the hydrates prepared with the aid of H2S are, for example, 6C12-2H2S-46H20, or 8C3H816H2S136H20 for types I and II hydrates, respectively. They are referred to as double hydrates. It is also possible to occupy the voids with mixtures of appropriate gases such as the mixture of methane, ethane, and propane, which occurs in natural gas, to yield mixed hydrates. 

Draw a picture of a portion of a saturated silver chloride solution at the molecular level. Show a small amount of soUd plus some dissociated ions. You need not show water or waters of hydration. Prepare a second drawing that... 

The single crystal of gas hydrate prepared from H2 + CO2 and H2 + CO2 + THF mixtures was analyzed by in situ Raman spectroscopy using a laser Raman microprobe spectrophotometer with multichannel CCD detector. In the present study, the single crystal was defined as the gas hydrate crystal for which the Raman peak of the intermolecular 0-0 vibration mode can be detected. The argon ion laser beam (wavelength 514.5 nm, power 100 mW) or He-Ne laser beam (wavelength 632.8 nm, power 35 mW) condensed to 2 pm in spot diameter was irradiated to the sample through the upper sapphire (or quartz) window. The backscatter of the opposite direction was taken in with the same lens. The spectral resolution was about 1 cm ... 

Cd/Ca silicate hydrates prepared by coprecipitation and Cd-exchanged C-S-H, have been characterized by Si and Cd MAS NMR X-ray diffraction, and EXAFS. ... 

Titration by iodine and by acid give the same results, showing that practically no ammonia is present in the hydrazine hydrate prepared by this method. 

Figure 4.15. Mass-loss curve of ( ) calcium silicate hydrale preparation (/ ) calcium silicate hydrate preparation plus added Ca(OH) (c calcium silicate hydrate preparations plus added amounts of CaC03 (33).

HAS/TOD] Hashimoto, K., Toda, Y., Miura, K., Hashimoto, K., Synthetic process and thermal behaviour of nickel hydrogenphosphate hydrate prepared by wet chemical method, Shikizai Kyokaishi, 67, (1994), 615-623. Cited on page 205. 

Chlorine hydrate, prepared as above, is placed in one arm of a thick-wall U tube and the tube is sealed off. The hydrate is decomposed by heatii and the chlorine formed is condensed immersii the other arm of the U tube in a refrigerant. Then the refrigerant is removed while the other side of the tube, which contains water saturated with CI3, is immersed in a vessel full of cold water. After some time large, very glittering, pale-yellow crystals are formed in this arm. 

Table 1. A summary of the hydrates (prepared by d Yvoire) and their anhydrous and thermal counterparts...

M.-I. Lannou, F. HeUon, J.-L. Namy, Synlett 2008, 105-107. Applications of lanthanide trichloride hydrates, prepared from mischmetaU, in the BigineUi reaction. 

Phenylhydrazine added at ca. 80° to an aq. soln. of 7,9-dihydroxy-6a-methoxy-2-phenyl-fran5-m-dioxano[5,4-e] [1 4]dioxepane hydrate prepared from methyl... 

Form Supplied in anhydrous white solid or as the hydrate. Preparative Methods the anhydrous salt of high purity can be prepared from lithium hydride and iodine in ether. Purification crystallized from hot H2O (0.5 mL g ) by cooling in CaCl2-ice or from acetone. Lil is dried for 2 h at 120 °C (0.1 mmHg, P2O5) before use. 

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