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Organic phosphorus compound

1-Methylphospholene-1-oxide (MPO)

1-Methyl-phospholene-1-oxide (isomeric mixture) is a clear, yellowish to brownish liquid. It is miscible and soluble in water.

Please note: This mixture of isomers is marketed as a pilot-product for evaluation and piloting purposes and is undergoing further development. The data set given below is based on the present state of know-how.

Product Data Sheet
  •  MPO can be used as a catalyst for different reactions
For regulatory details such as the classification and labelling as dangerous substances or goods please refer to our corresponding Material Safety Data Sheet. For disposal in accordance with the regulations the product should be taken to a suitable incineration plant.

Characteristics   Unit   Target value   DS¹) TD²) Test Method 
Appearance (at 20°C)    Clear yellowish to brownish liquid that may reversible precipitate solids during long-term storage at low temperature  

Visual evaluation  
Phosphorus % w/(w   min. 98.0  

Content Isomers A+B, gas chromatography; (11/09)  
Volatile Content %(w/w)   max. 1.0  

Water by Karl-Fischer titration; (11/21)  
¹) The product is constantly monitored to ensure that it adheres to the specified values. Test methods: Clariant method numbers 11/xx in brackets.
²) The technical data are used solely to describe the product and are not subject to constant monitoring.  


1-Methyl-phospholene-1-oxide is used as a catalyst in the production of carbodiimides from isocyanates. It also catalyses phosgenation reactions.
Packaging and Handling
Delivery form

1-Methyl-phospholene-1-oxide is delivered in 1L-PE-bottles containing 1000 g and 6L- PE-bottles containing 5000 g product.

During prolonged storage under cool conditions the product may separate a solid phase. Separated material may be
dissolved and homogenized again by moderate warming and agitating.

Minimum shelf life is 24 months from the date of shipping when stored according to the said conditions.

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