941 resultados para United Farm Equipment and Metal Workers of America.
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"Serial no. 110-14."
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"Serial no. 110-22."
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Shipping list no.: 2009-0291-P.
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"Serial no. 110-15."
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Shipping list no.: 2009-0314-P.
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"Serial no. 110-9."
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"Serial no. 110-26."
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I.1492-1763.--III.1814-1861.--IV.1861-1893.
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Mode of access: Internet.
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Pyridinium poly(hydrogen fluoride) reacts with the oxide of vanadium(V) and chlorides of chromium(III), iron (III) and Co(II) at room temperature forming the pyridinium salts of hexafluoro vanadate(V), hexafluorochromate(III), hexafluoroferrate(III) and hexafluorocobaltate(II) in near quantitative yields (80%). These pyridinium salts are the precursors for the preparation of the alkali metal hexafluorometallates by metathetic reactions in acetonitrile medium with the corresponding metal chlorides. The prepared salts have been identified by their infrared spectral data and elemental analysis.