| http://www.w3.org/ns/prov#value | - The teachings of the foregoing patents are incorporated herein by reference.One class of double metal cyanide complex catalysts found particularly suitable for use herein is are zinc hexacyanometallates of the general formula:wherein M may be Co(III), or Cr(III) or Fe(II) or Fe(III); x, y, and z may be fractional numbers, integers, or zero and vary depending on the exact method of preparation of t
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