| http://www.w3.org/ns/prov#value | - A general formula for such catalysts is: ##STR1## where M is iron, cobalt, manganese or chromium, N3 is azide, is phthalocyanine and M' is alkali metal, such as sodium, potassium or lithium, or ammonium or tetraalkylammonium such as tetrabutylammonium.
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