Production of polyoxymethylene and suitable (II) catalysts
AssigneeBASF SE
InventorsHans-Helmut Görtz, Gerrit Luinstra, Wolfram Wielandt, Michael Henes, Ekkehard Lindner
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Abstract
A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I [CpvMLw]m+Zm/nn− (I) where M is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh or Ir, Cp is a cyclopentadienyl ligand C5H(5-u)R1u, where u is from 0 to 5 and R1 is alkyl, alkenyl, aryl, heteroaryl, aralkyl, COOR2, COR2, CN or NO2, and R2 is H, alkyl, aryl or aralkyl, v is 1 or 2, each L is independently a nitrile, CO or a ligand displaceable by CO, w is an integer from 0 to 4, Z is an anion, and m and n are each independently an integer from 1 to 3.
Claims9
A process for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula I
- [CpvMLw]m+Zm/nn− (I)
- where
- M is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh or Ir,
- Cp is a cyclopentadienyl ligand C5H(5-u)R1u, where
- u is from 0 to 5 and
- R1 is alkyl, alkenyl, aryl, heteroaryl, aralkyl, COOR2, COR2, CN or NO2, and
- R2 is H, alkyl, aryl or aralkyl,
- v is 1 or 2,
- each L is independently a nitrile, CO or a ligand displaceable by CO,
- w is an integer from 0 to 4,
- Z is an anion, and
- m and n are each independently an integer from 1 to 3.
A catalyst of the formula Ia
- [CpM(CO)2)L]+Z1/nn− (Ia)
- where
- M is Mo or W,
- Cp is a cyclopentadienyl ligand C5H4R1 or C5H3R12, where R1 is CHO, COCH3, COOCH3 or COOC2H5,
- L is CO or CH3CN,
- Z is trifluoromethanesulfonate, trifluoroacetate, tetrafluoroborate, hexafluorophosphate or hexafluoroantimonate and
- n is an integer from 1 to 3.
Dependencies are inferred from the claim text.