Now showing items 11-20 of 44
Building a lewis acidic phosphorus
Using the σ- and п-donating properties of carbodiphosphorane ligands, we recently synthesized a phosphorus (III)-containing dication. It is observed to undergo interesting reactivity with PMe3, H2O and MeOH.
C-F bond activation by transient phosphenium dications
C–F bond cleavage by transient phosphorus(III)-based dications [RP(C(PPh3)2)]2+ (4a2+, R = Ph; 4b2+, R = 4-F-Ph) is reported. These dications were generated by reaction of the corresponding monocationic precursors with ...
Crystal structure of (Z)-1-phenyl-3-styrylundeca-2-en-4,10-diyn-1-ol
The molecule of the title compound, C25H24O, obtained by acid-catalysed 1,3-migration of an alcohol group, is T-shaped. The planes of the two phenyl rings are inclined to one another by 81.9 (2)°. In the crystal, molecules ...
A dicationic iminophosphane
A novel dicationic system containing a PN fragment has been synthesized and structurally characterized. According to the solid-state analysis and theoretical investigation, the dicationic iminophosphane resonance form is ...
A well-defined aluminum-based lewis acid as an effective catalyst for Diels-Alder transformations
A catalytically active aluminum-based system for Diels–Alder transformations is reported. The system was generated by mixing a β-diketiminate-stabilized aluminum bistriflate compound with Na[BArCl4] (ArCl=3,5-Cl2C6H3). ...
NHC-catalyzed ester activation : access to sterically congested spirocyclic oxindoles via reaction of α-aryl esters and unsaturated imines
Carboxylic esters can be readily obtained at low cost. Therefore, asymmetric catalytic activation of esters should provide useful strategies for organic synthesis. Here we report a N-heterocyclic carbene (NHC)-mediated ...
Extending the chemistry of carbones : P-N bond cleavage via an SN2′-like mechanism
The reactivity of nucleophilic carbodiphosphorane (C(PPh3)2, 1) and carbodicarbene (C(C(NMe)2C6H4)2, 2) towards various dichlorophosphines has been explored. In most cases the expected carbone-for-chloride ligand exchange ...
Isolation of a bis(oxazol-2-ylidene)-phenylborylene adduct and its reactivity as a boron-centered nucleophile
An isolable phenylborylene species supported by two oxazol-2-ylidene ligands was synthesized and structurally characterized. Computational studies revealed the presence of lone-pair electrons on the boron atom in this ...
Synthesis of N-heterocyclic carbene stabilized catecholatoborenium cations by ligand substitution
Ligand substitution is not a common procedure for the preparation of different borenium cations. This work demonstrates that the chloride ligands of several NHC-stabilized dichloroborenium cations [NHC·BCl2][X] (NHC = ...
Dihaloborenium cations stabilized by a four-membered N-heterocyclic carbene : electron deficiency compensation by asymmetric structural changes
The synthesis, characterization and X-ray analysis of dichloro- and dibromo-borenium cations stabilized by a 4-membered carbene are reported. The ligand's structural changes, atypical for similar systems, were caused by ...