40612-18-8Relevant articles and documents
The Trityl-Cation Mediated Phosphine Oxides Reduction
Landais, Yannick,Laye, Claire,Lusseau, Jonathan,Robert, Frédéric
supporting information, p. 3035 - 3043 (2021/05/10)
Reduction of phosphine oxides into the corresponding phosphines using PhSiH3 as a reducing agent and Ph3C+[B(C6F5)4]? as an initiator is described. The process is highly efficient, reducing a broad range of secondary and tertiary alkyl and arylphosphines, bearing various functional groups in generally good yields. The reaction is believed to proceed through the generation of a silyl cation, which reaction with the phosphine oxide provides a phosphonium salt, further reduced by the silane to afford the desired phosphine along with siloxanes. (Figure presented.).
Catalytic asymmetric intramolecular hydroamination of alkynes in the presence of a catalyst system consisting of Pd(0)-methyl Norphos (or tolyl Renorphos)-benzoic acid
Narsireddy, Meda,Yamamoto, Yoshinori
supporting information; experimental part, p. 9698 - 9709 (2009/04/07)
(Chemical Equation Presented) Enantiomerically pure methyl Norphos (A), tolyl Norphos (B), CF3 Norphos (C), methyl Renorphos (D), and tolyl Renorphos (E) were synthesized and used as chiral bisphosphine ligands for the catalyst system, Pd2(dba)3·CHCl3/PhCOOH, in an intramolecular hydroamination of aminoalkynes 15. Among the Norphos series, methyl Norphos (A) was the best ligand for the hydroamination, and the corresponding five- and six-membered nitrogen heterocycles 16 were obtained in high yields with high enantioselectivities. Among the Renorphos series, tolyl Renorphos (E) gave the best result; both methyl Norphos (A) and tolyl Renorphos (E) afforded high yields and high enantioselectivities. NMR investigation using Me-Norphos revealed that this ligand was oxidized gradually in the presence of Pd2(dba)3·CHCl3 in C6D 6 even under the conditions using Ar atmosphere to give Me-Norphos oxide, which prevented the intramolecular hydroamination. On the other hand, Me-Norphos was rather stable in C6D6 in the absence of the palladium catalyst under Ar atmosphere and was not converted to its oxide even after 3 days. The gradual oxidation of ligands (A and E) in the presence of the Pd catalyst is perhaps a reason why 20 mol % of A or E was needed to obtain high yields and high ee's of 16.
Investigation into Diphosphine Oxides as Ligands in Diorganotin(IV) Adducts. Part 3. Synthesis and Crystal Structure of Two Adducts of Dinitratodiphenyltin(IV) with cis- and trans-1,2-Bis(diphenylphosphoryl)ethylene
Dondi, Stefano,Nardelli, Mario,Pelizzi, Corrado,Pelizzi, Giancarlo,Predieri, Giovanni
, p. 487 - 492 (2007/10/02)
The co-ordinating properties of cis- and trans-1,2-bis(diphenylphosphoryl)ethylene (cdppoet and tdppoet respectively) have been examined in two new organotin(IV) complexes, SnPh2(NO3)2(cdppoet)*CHCl3 (1) and 2(tdppoet)*H2O (2), on both of whi
