Synthesis of a Mixed Phosphonium–Sulfonium Bisylide R₃PCSR₂

Abstract

Bunt gemischt: Die ersten beständigen Phosphor‐Schwefel‐Bisylide (siehe Schema) wurden synthetisiert und anhand chemischer Reaktionen wie Methylierung und Komplexierung an CuI identifiziert. DFT‐Rechnungen an einer Modellverbindung weisen auf stark polarisierte Spezies hin, in denen die freien Elektronenpaare des zentralen Kohlenstoffatoms ausschließlich mit der Phosphoniumfunktion wechselwirken.

Schlechte Zeiten für akute myeloische Leukämie

“…In the 1:1 addition complexes of C(PPh 3 ) 2 ( 1 ) with CuCl and Cu(C 5 Me 5 ) the Cu–C bond lengths drop down to 1.906(2) Å11 and 1.922(6) Å,12 respectively. Similar short values were found in the addition compound between the mixed carbone ( i Pr 2 N) 2 MeP→C←SPh 2 and CuN(SiMe 3 ) 2 amounting to 1.903(4) Å 13. It is interesting to note that in related Cu‐NHC addition compounds, Cu–C distances between 1.877(4) Å and 1.938(5) Å were found 14…”

Syntheses and Crystal Structures of Copper and Silver Complexes with the Ylide Ph3PCHP(O)PPh2 as Ligand

“…Similar short values were found in the addition compound between the mixed carbone (iPr 2 N) 2 MePǞCǟSPh 2 and CuN(SiMe 3 ) 2 amounting to 1.903(4) Å. [13] It is interesting to note that in related Cu-NHC addition compounds, Cu-C distances between 1.877(4) Å and 1.938(5) Å were found. [14] Among the derivatives of 2 with an exclusive C coordination the compounds 3, 4·7/8CH 2 Cl 2 , and 5 represent the unique examples known so far and some bonding parameters are compared in Table 1.…”

Distinguishing Carbones from Allenes by Complexation to AuCl

“…[11] The finding [3] that carbodiphosphoranes are divalent carbon(0) compounds CL 2 , which possess two donor-acceptor bonds to a bare carbon(0) atom L!C ! L, was the starting point for theoretical [4-6, 8-9, 12-15] and renewed experimental [13][14][15][16][17][18] investigations that searched Abstract: Quantum chemical calculations have been performed for the dicoordinated carbon compounds C-A C H T U N G T R E N N U N G (PPh 3 ) 2 , CA C H T U N G T R E N N U N G (NHC Me ) 2 , R 2 C=C = CR 2 (R = H, F, NMe 2 ), C 3 O 2 , C(CN) 2 À and N-methyl-substituted N-heterocyclic carbene (NHC Me ). The geometries of the complexes in which the dicoordinated carbon molecules bind as ligands to one and two AuCl moieties have been optimized and the strength and nature of the metal-ligand interactions in the mono-and diaurated complexes were investigated by means of energy decomposition analysis.…”