Phosphanes aliphatic

Phonon broadening, 34 247,253 Phosgene, catalytic synthesis, 28 270-273 Phosphanes aliphatic, 42 493 hydroxyalkyl-substituted, 42 482 quaternary ammonium, 42 492 sugar derivatives, 42 482-483 sulfonated, 42 476-478 Phosphanorbomadienes... 

Whereas the reactions of allenephosphonates 171 (R2 = OEt) with primary aliphatic and aromatic amines 172 and the reactions of the phosphane oxides 171 (R2 = Ph) with aliphatic amines 172 afford the conjugated addition products 173 always in good yields, the addition of anilines to 171 (R2 = Ph) leads to an equilibrium of the products 173 and 174 [231]. However, treatment of both phosphane oxides and phos-phonates of type 171 with hydroxylamines 172 (R3 = OR4) yields only the oximes 174 [232, 233]. The analogous reaction of the allenes 171 with diphenylphosphinoylhy-drazine furnishes hydrazones of type 174 [R3 = NHP(0)Ph2] [234],... 

All experiments to obtain -phosphazenes from chlorophosphanes, phosphane, and phenylphosphane were unsuccessful (19HCA635). Reactivity studies revealed that aliphatic phosphanes react more smoothly than the aromatic ones. However, the azides did not show any differences with respect to their substituents (19HCA635, 19HCA619 20CB72). 

Recently, this group published a route to new water-soluble, aliphatic phosphanes that build complexes of the same structure as 13 (109). Cy2P (CH2)2N(CH3)3Cr. Cy2P(CH2)2S03Na+, and others were prepared from air-stable, borane-protected precursors. The steric and electronic parameters of these new phosphanes were investigated. 

Reaction of the partially fluorinated aliphatic aromatic ketone 22 with bromotrifiuoromethane/ tris(diethylamino)phosphane leads to formation of the tertiary aryl alcohol 23. ° ... 

In attempts to prepare aliphatic cyclopropylidene-2 -phosphanes, (3-bromopropyl)trialkyl- or cycloalkylphosphonium bromides were treated with sodium amide in liquid ammonia at low temperatures, the intermediate phosphonium salts being deprotonated to give alkylidene-1 -phosphanes and not cyclopropylidene-2 -phosphanes. ... 

Asymmetric hydrocarboxylation of styrene and aliphatic alkenes with palladium(II) chloride in the presence of the steroidal phosphanes (+)-DICOL and (—)-DIOCOL (prepared from cholesterol) show remarkable catalytic activity and very high regioselectivity, but only poor stereoselectivities21, 22. Optical yields of up to 12.5% ee are obtained in asymmetric hydrocar-boxylations using DIOCOL. The results obtained with DICOL and DIOCOL have been compared with the inductions obtained with Diop. 

The reaction of a-branched aliphatic aldehydes with PH3 in hydrochloric acid does not yield hydroxyalkylphosphonium salts because of steric repulsion among the substituent groups. Instead, secondary phosphanes are obtained, in which phosphorus is part of heterocyclic 1,3-dioxa-5-phospha-cyclohexanes [134, 136 to 138, 179, 180]. 

In 2013, Gaydou and Echavarren [94] reported the use of Au(I) catalysts for the synthesis of tetrazoles from alkynes and TMSNj. They used either phosphane-based catalysts (such as the John-Phos/Au(I) complex, this was actually the catalyst of choice for this transformation) or NHC-Au(l) catalysts, at 2 mol% loading. Broad scope was demonstrated - both aromatic and aliphatic alkynes could be used - but the yields were moderate to good. 

---