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Phosphines [Chemical Structural Class]

 Phosphorus belongs to group 15 in the periodic table, the same as nitrogen, and it binds with carbon to form various organophosphate compounds. However, since nitrogen belongs to the second-period and phosphorus to the third, they differ in atomic size, ionization energy and electronegativity etc. Therefore, organophosphate compounds show a characteristic reactivity which organic nitrogen compounds do not have, and it is utilized as a versatile reaction reagent in organic synthesis. For example, phosphorus has a high affinity for oxygen: phosphorus ylide and phosphonate are utilized for the Wittig reaction and the Horner-Emmons reaction, respectively, and it extracts oxygen from aldehydes to produce olefins. Phosphine extracts oxygen from alcohols to produce esters in the Mitsunobu reaction.
 Another feature of phosphine includes bearing a soft lone pair. Therefore, it forms comparatively stable complexes with transition metals such as palladium. This transition metal complex is used frequently as a catalyst in reactions such as the Suzuki-Miyaura cross-coupling reaction and the Heck reaction.1) Although phosphine also has a trigonal pyramidal structure like amines, its rotational barrier energy is considerably higher than the corresponding amine. Therefore, a phosphine which has three different substituents has optical isomers. This optically-active phosphine is utilized for asymmetric syntheses as a P-chiral ligand.2) In this section, we introduce tri-substituted alkyl and aryl phosphines, such as tricyclohexylphosphine and triphenylphosphine.


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Artikel # C0597
CAS RN 1079-66-9
Reinheit >97.0%(T)

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Reinheit >97.0%(HPLC)

Artikel # T1025
CAS RN 6224-63-1
Reinheit >98.0%(GC)

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Reinheit >99.0%(HPLC)

Artikel # S0930
CAS RN 244261-66-3
Reinheit >99.0%(HPLC)

Artikel # B2717
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Reinheit >98.0%(HPLC)(N)

Artikel # E0519
CAS RN 607-01-2
Reinheit >97.0%(GC)