text.skipToContent text.skipToNavigation

Maximum quantity allowed is 999

Gelieve het aantal te selecteren

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.

Literature

110 Gevonden Resultaten
Bekijk:  Lijst
Artikel # V0132
CAS RN 384842-25-5
Zuiverheid >98.0%(HPLC)

Artikel # I0583
CAS RN 6372-40-3
Zuiverheid >97.0%(GC)(T)

Artikel # X0071
CAS RN 135139-00-3
Zuiverheid >97.0%(HPLC)

Artikel # S0929
CAS RN 210169-54-3
Zuiverheid >99.0%(HPLC)

Artikel # X0070
CAS RN 137219-86-4
Zuiverheid >97.0%(HPLC)

Artikel # T2900
CAS RN 18437-78-0
Zuiverheid >98.0%(GC)

Artikel # T3153
CAS RN 100165-88-6
Zuiverheid >98.0%(HPLC)

Artikel # D4953
CAS RN 34825-99-5
Zuiverheid >98.0%(GC)(T)

Artikel # D4825
CAS RN 16605-03-1
Zuiverheid >95.0%(GC)(T)

Artikel # D2404
CAS RN 110231-30-6
Zuiverheid >95.0%(GC)

Artikel # D4781
CAS RN 131211-27-3
Zuiverheid >95.0%(GC)

Artikel # D4500
CAS RN 210169-40-7
Zuiverheid >99.0%(HPLC)

Artikel #:   V0132 | Zuiverheid   >98.0%(HPLC)

Artikel #:   I0583 | Zuiverheid   >97.0%(GC)(T)

Artikel #:   X0071 | Zuiverheid   >97.0%(HPLC)

Artikel #:   S0929 | Zuiverheid   >99.0%(HPLC)

Artikel #:   X0070 | Zuiverheid   >97.0%(HPLC)

Artikel #:   T3153 | Zuiverheid   >98.0%(HPLC)

Artikel #:   D4781 | Zuiverheid   >95.0%(GC)

Artikel #:   D4500 | Zuiverheid   >99.0%(HPLC)