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15175 Aldrich

Bis[tetrakis(hydroxymethyl)phosphonium] sulfate solution

technical, 70-75% in H2O (T)

Synonym: Tetrakis(hydroxymethyl)phosphonium sulfate

  • CAS Number 55566-30-8

  • Linear Formula [(HOCH2)4P]2(SO4)

  • Molecular Weight 406.28

  •  Beilstein Registry Number 8521357

  •  MDL number MFCD23102118

  •  PubChem Substance ID 57647331



Related Categories Chemical Synthesis, Phase Transfer Catalysts, Phosphonium Salts, Synthetic Reagents
grade   technical
concentration   70-75% in H2O (T)
impurities   formaldehyde


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Frequently Asked Questions are available for this Product.


250 mL in poly bottle

Price and Availability

Laboratory Gloves

Cross-Coupling Guide
Safety & Documentation

Safety Information

Signal word 
Hazard statements 
UN2922 - class 8 - PG 3 - EHS - acidic - Corrosive liquids, toxic, n.o.s., HI: all
WGK Germany 


Certificate of Analysis

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
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Product 15175, Bis[tetrakis(hydroxymethyl)phosphonium] sulfate solution, is listed as a phase transfer catalyst. What does this mean?
A phase transfer catalyst (PTC) is a compound that promotes or accelerates a chemical reaction by allowing the migration of a specific chemical component from one phase into another phase in a heterogeneous system. A PTC is typically used when the starting materials for a reaction cannot be mixed into the same phase, which would prevent them from coming into contact each other to react. It can transport a reagent from a hydrophilic phase into the hydrophobic phase (and vice versa) so that the subsequent reaction can occur.
Is there a list available of phase transfer catalysts that are sold by Sigma-Aldrich?
More phase transfer catalysts can be found at the following link: http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=16278277
Does Sigma-Aldrich offer any chiral phase transfer catalysts?
We offer several chiral phase transfer catalysts to produce enantiospecific products. You may be interested in the following link, which directs you to a list of chiral PTCs: http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=16263160. You may also be interested in ChemFiles 6.4 on Asymmetric Organocatalysis as it contains information on chiral PTCs. This publication is accessible through the following link. http://www.sigmaaldrich.com/chemistry/chemical-synthesis/learning-center/chemfiles-2006-2008.html
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