Hexammine, calcium

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)... 

Mit Hexammin-calcium lassen sich in befriedigenden Ausbeuten Dialkyl-alkine zu trans-Alkenen reduzieren (Bd. V/lb, S. 583), doch in der Regel wird Natrium in fl. Am-moniak eingesetzt. 

Wegen der entstehenden Produktgemische ist die partielle Reduktion von aromatischen Kohlenwasserstoffen mit Hexammin-calcium praktisch ohne Bedeutung. Temperaturer-... 

The positive identification of the sulfur compounds in crude oils is a difficult problem often complicated by the lack of reference compounds. This difficulty has been overcome by hydrodesulfurization (see Section VIII), which converts the sulfur compounds into known hydrocarbons. Treatment of a petroleum oil fraction with calcium hexammine converts the benzo[6]thiophenes present into aryl mercaptans, which are readily separable from accompanying aromatic hydrocarbons (e.g., naphthalene) and then identified by hydro-... 

According to H. Moissan, if ammonia be passed over crystalline calcium, there is a rise of temp. and if the temp, be kept at l5°-20°, the calcium becomes brownish-red, and swells up, but does not form a soln. as do the alkali metals, liquid ammonia dissolves a little, forming a blue soln. The product inflames when exposed to air and at —80°, ammonium chloride gives ammonia and hydrogen. H. Moissan said that the product is calcium tetrammine, Ca(NH3)4. C. A. Kraus, however, showed that this product must have been a mixture because the compound actually formed is calcium hexammine, Ca(NH3)6. He found... 

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