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US 2026/0217912 A1Published application
Alkoxylation processes using monocationic and dicationic cyclopentadienyl phosphorus catalysts
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsPeter J. WALLER, Varinia BERNALES, David S. LAITAR, Clark H. CUMMINS, Matthew E. BELOWICH
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Abstract
Alkoxylations are performed by reacting a cyclic oxide with a starter compound in the presence of certain cyclopentadienyl phosphorus catalysts. The cyclopentadienyl phosphorus catalysts are highly active and effective in such small quantities that it is often unnecessary to remove catalyst residues from the product. The cyclopentadienyl phosphorus catalysts are very effective in alkoxylating even low molecular weight starter compounds such as glycerol and sorbitol.
Claims15
An alkoxylation process comprising the following steps:
- (I) forming a reaction mixture comprising;
- a) a starter compound having at least one hydroxyl or thiol group, b) at least one cyclic oxide, and c) a catalytically effective amount of a phosphorus catalyst having either of the structures:
- (Cp*PX)+n An− or (Cp*P)2+(An−)2/n where Cp* designates an optionally substituted cyclopentadienyl ligand, X represents halogen, hydroxyl, unsubstituted or inertly substituted alkyl, unsubstituted or inertly substituted alkoxy, or unsubstituted or inertly substituted aryloxy, A represents a weakly coordinating anion, and n is the absolute value of the valence of A;
- and
- (II) reacting the cyclic oxide b) with the starter compound a) in the presence of the phosphorus catalyst c) to form an alkoxylated product.
2 more elements
Dependencies are inferred from the claim text.