Calcium hydride CAS

The submitters used a 10-mL, pressure-equalized addition funnel [containing a cotton piug, calcium hydride (ca. 3 g, iumps), and sea sand (ca. 1 g)] in piace of the Soxhiet extractor. The submitters empioyed caicium hydride (ca. 1-10 mm, No. 068-34) purchased from Nacaiai Tesque, Ire. Alternatively, 4A molecular sieves can be used h place of calcium hydride. 

Calcium Hydride. CAS 7789-78-8], CalL. white solid, reacts wiih water yielding hydrogen gas and calcium hydroxide when electrolyzed in fused potassium lithium chloride, hydrogen is liberaied at the anode. 

Calcium hydrate. See Calcium hydroxide Calcium hydride CAS 7789-78-8 57308-10-8 Synonyms Calcium dihydride... 

Hydrogen for weather balloons is often supplied by the reaction between solid calcium hydride, CaH2, and water to form solid calcium hydroxide, Ca(OH)2, and hydrogen gas, H ... 

Schwab, W., u. K. Wintersberger Ober Darstellung und Eigenschaften von Calcium-aluminium-hydrid Ca(AlH4)2. Z. Naturforschg. 8b, 690 (1953). 

Boron trifluoride etherate (BF3-Et20) was purchased from Aldrich Chemical Company, Inc. and distilled at 20 mm from calcium hydride. The overall yield for the reaction is reduced by ca. 10% if less BF3 Et20 (1.1 equiv) or less dimethoxymethane (20 equiv) is employed. 

Hexammine, Calcium. Probably Ca(NH3)g. The compd decomposes explosively when heated in vacuum. The temp of explosion depends on the degree of vacuum. Products of the decomp are Ca nitride hydride and hydrogen (Ref 1) However, later studies (Ref 2) suggest that Ca Hexammine explosions are due to impurities which catalyze its decomposition Refs 1) E. Botolfsen, BullSocChim 31, 56 (1922) CA 16, 4154 (1922) 2) A.C. Pappas, ActaChemScand 3, 36 (1949) CA 43, 785 (1949)... 

Though not as chemically reactive as the alkali metals, the alkaline earth metals lose or share two outermost electrons easily to obtain eight outermost electrons. Calcium (Ca) reacts with hydrogen gas (H2) to produce calcium hydride (CaH2), and with water (H20) to produce calcium (Ca2+), hydroxide ions (OH-) and hydrogen gas (H2) ... 

The preparation of calcium bis[tetrahydroborate(l —)] described here is recommended because high yields of pure product are usually obtained without difficulty. If the material should be contaminated by impurities from the calcium hydride, then it may be extracted with THF. Needles of Ca[BH4]-2THF11,21,22 may be obtained from this solution. The THF can then be readily removed by heating and pumping. 

The Ca-N-H system possesses even more complicated properties. Hino et al. [34] reported the thermal desorption properties of the mixture of calcium amide (Ca(NH2)2) and calcium hydride (CaH2) with two different ratios (1 1 and 1 3) and the mixture of CaNH and CaH2 as shown in Figure 6.5. From this result, Ca(NH2)2 and CaH2 with the 1 3 ratio desorbs H2 gas by the following two-step reaction (3.5 and 2.1mass%, respectively) ... 

Dimethyl sulfoxide was stirred and heated at ca. 100°C with powdered calcium hydride for 2 hr, distilled under reduced pressure, and used at once. 

Triphenylphosphins (obtained from General Intermediates of Canada) and N-(benzyloxycarbonyl)-L-serine (obtained from Sigma Chemical Company) were dried under reduced pressure over P2O5 for 72 hr and 24 hr, respectively. Acetonitrile was refluxed over calcium hydride (CaHs) for ca. 10 hr and distilled from CaH2 before... 

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