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膦类 [化学结构分类]

 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

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产品编码 T1025
CAS RN 6224-63-1
纯度/分析方法 >98.0%(GC)

产品编码 T1643
CAS RN 5518-52-5
纯度/分析方法 >98.0%(GC)

产品编码 T1656
CAS RN 51805-45-9
纯度/分析方法 >98.0%(T)

产品编码 T2139
CAS RN 554-70-1
纯度/分析方法 >98.0%(GC)

产品编码 T2526
CAS RN 175136-62-6
纯度/分析方法 >98.0%(GC)

产品编码 T2900
CAS RN 18437-78-0
纯度/分析方法 >98.0%(GC)

产品编码 T3152
CAS RN 99646-28-3
纯度/分析方法 >98.0%(HPLC)

产品编码 T3153
CAS RN 100165-88-6
纯度/分析方法 >98.0%(HPLC)

产品编码 V0132
CAS RN 384842-25-5
纯度/分析方法 >98.0%(HPLC)

产品编码 B1137
CAS RN 1663-45-2
纯度/分析方法 >97.0%(GC)(T)

产品编码 B1174
CAS RN 23936-60-9
纯度/分析方法 >97.0%(GC)

产品编码 B1982
CAS RN 2071-20-7
纯度/分析方法 >97.0%(GC)(T)

产品编码:   T1025 | 纯度/分析方法   >98.0%(GC)

产品编码:   T1643 | 纯度/分析方法   >98.0%(GC)

产品编码:   T1656 | 纯度/分析方法   >98.0%(T)

产品编码:   T2139 | 纯度/分析方法   >98.0%(GC)

产品编码:   T2526 | 纯度/分析方法   >98.0%(GC)

产品编码:   T2900 | 纯度/分析方法   >98.0%(GC)

产品编码:   T3152 | 纯度/分析方法   >98.0%(HPLC)

产品编码:   T3153 | 纯度/分析方法   >98.0%(HPLC)

产品编码:   V0132 | 纯度/分析方法   >98.0%(HPLC)

产品编码:   B1137 | 纯度/分析方法   >97.0%(GC)(T)

产品编码:   B1174 | 纯度/分析方法   >97.0%(GC)

产品编码:   B1982 | 纯度/分析方法   >97.0%(GC)(T)

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