23808-01-7

Upstream product

• 7650-90-0 dibenzylphenylphosphane 
• 23275-37-8 Benzyl-methyl-phenyl-phosphin 
• 147127-50-2 (S,S)-(-)-1,2-bis(methoxyphenylphosphinoborane)ethane 
• 1020091-66-0 C₁₆H₂₆B₂P₂ 
• 1663-45-2 1,2-bis-(diphenylphosphino)ethane 
• 74-88-4 methyl iodide 
• 6372-48-1 methylphenylphosphine 
• 74-86-2 acetylene 

Downstream Products

• 18582-75-7 1r,3c-dimethyl-1,3t-diphenyl-[1,3]diphospholanediium; dibromide 
• 39162-64-6 chir-anti-{RuCl₂(d-C₁₆H₂₀P₂)2} 
• 106906-10-9 [1,2-bis(methylphenylphosphino)ethane]dicarbonylhydrido(trimethylsilyl)iron 
• 106906-13-2 tricarbonyl[1,2-bis(methylphenylphosphino)ethane]iron 

Relevant academic research and scientific papers

Enantiodivergent synthesis of P-chirogenic phosphines

Several approaches for the enantiodivergent synthesis of P-chirogenic mono- and diphosphines are described, using ephedrine methodology and phosphine borane chemistry. Firstly, both enantiomers of a tertiary phosphine can be obtained starting from the same oxazaphospholidine borane complex, prepared from (+)-ephedrine, when changing the order of addition of the organolithium reagents during the synthetic pathway. The second approach is based on the chlorophosphine boranes, which react with an organolithium reagent, to afford the corresponding phosphines with inversion of configuration. In the case where the chlorophosphine borane reacts with the t-butyl lithium reagent, a metal-halogen exchange occurs to afford the corresponding phosphide borane with retention of the configuration. The reaction of the phosphide borane with an alkyl halide leads to the same phosphine, but with the opposite configuration. Another approach depends on the diastereoselective preparation of the starting oxazaphospholidine borane complex from (-)-ephedrine, which leads according the case, to either one or the other enantiomer of a phosphine. Finally, the synthesis of (R,R)- and (S,S)-1,2-bis(methylphenylphosphino)ethane is also demonstrated using both enantiomers of the P-chirogenic diphosphinite diborane, which simultaneously allows the introduction of alkyl- or aryl substituents on the phosphorus atoms. In summary, these approaches show the great efficiency of the "ephedrine methodology" for the enantiodivergent synthesis of P-chirogenic mono- and diphosphines, and bearing alkyl or aryl substituents.

Ultrasound in Phosphine Preparation. Simple Preparations of Some Bis(alkylphenylphosphino)alkanes

Diphosphines of the class RPhP(CH2)nPPhR (n=2-6) have been prepared from reactions of the corresponding Ph2P(CH2)nPPh2 with alkali metall followed by alkylation.Ultrasound irradiation should be applied in the reductive cleavage stage so as to assure the purity of the final products.