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Acetylthiomethyl-diphenylphosphine borane complex


Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
PubChem Substance ID:





reaction suitability

reaction type: click chemistry
reagent type: ligand
reaction type: Staudinger Reaction


52-55 °C

storage temp.


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  • Traceless Staudinger ligation reagent with borane protecting group.
  • The borane group stabilizes the phosphine against oxidation and can be easily removed with mild basic or acidic conditions to yield the active phosphine.
  • After reaction with an azide, the phosphine is eliminated in the presence of water to yield a native amide bond.
  • Used in the synthesis of cyclic peptides.
Acetylthiomethyl-diphenylphosphine borane complex Ligation with DABCO


1 g in glass bottle
250 mg in glass bottle
Bottomless glass bottle. Contents are inside inserted fused cone.

Legal Information

Sold under license for research and development purposes only. US Patent 6,974,884 and related patents apply


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Hazard Statements

Precautionary Statements

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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More Documents

Quotes and Ordering

Michaela Mühlberg et al.
Bioorganic & medicinal chemistry, 18(11), 3679-3686 (2010-05-15)
The traceless Staudinger ligation has recently found various applications in the field of peptide synthesis and modification, including immobilization and cyclization strategies. In this report, we utilize the traceless Staudinger ligation in the formation of amide bonds, which allows the
Matthew B Soellner et al.
The Journal of organic chemistry, 67(14), 4993-4996 (2002-07-06)
The Staudinger ligation of peptides with a C-terminal phosphinothioester and N-terminal azide is an emerging method in protein chemistry. Here, the first Staudinger ligations of nonglycyl azides are reported and shown to proceed both in nearly quantitative yield and with


Azide Building Blocks for Chemical Ligation

Chemoselective ligation strategies are a key success factor for chemical biology research. Ligation techniques open pathways to fully synthetic large peptides and even proteins.

Traceless Staudinger Ligation

Based on the same working principle as the nontraceless Staudinger Ligation the auxiliary phosphine reagent can be cleaved from the product after the ligation is completed leaving a native amide bond. Thus, the total chemical synthesis of proteins and glycopeptides is enabled overcoming the limitations of native chemical ligation (NCL) of a Cys residue at the ligation juncture.

Staudinger Ligation

The reaction between an azide and a phosphine forming an aza-ylide was discovered almost a century ago by Nobel Prize laureate Herrmann Staudinger.


Traceless Staudinger Ligation

Traceless Staudinger Ligation

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Raines Group – Professor Product Portal

Professor Ron Raines works with Sigma-Aldrich on the development of reagents and tools for chemical biology such as the traceless Staudinger ligation reagent (670359). DTBA (774405), a superior biological reducing reagent to DTT, is another technology to come out of the Raines lab.

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