Chlorido[2-(diphenyl­phos­phino)­aceto­phenone]gold(I)

In the crystal structure of the title compound, [AuCl(C20H17OP)], the phosphine acts as a monodentate ligand. The Au atoms are attached solely to the P and Cl atoms. The coordination is linear without any tendency to aggregate via aurophilic inter­actions

μ-Bis(diphenyl­arsino)methane-κ2 As:As′-bis­[chloridogold(I)]

The title structure, [Au2Cl2(C25H22As2)], consists of discrete mol­ecules disposed about a crystallographic twofold axis. The Au atom exhibits a nearly linear coordination by As and Cl atoms. Au⋯Au inter­actions [3.4285Å(4) Å] and a weak intermolecular C—H⋯Cl hydrogen bond are present

Synthesis, Structure and Coordination Chemistry of Selected Phosphororganic Compounds and their Nitrogen and Arsenic Analoges

Die Dissertation ist der Chemie der Phosphorane, einer speziellen Klasse hypervalenter Verbindungen mit fünf P-C-Bindungen, gewidmet, die nur unter speziellen Voraussetzungen herstellbar sind. Die einfachen Pentaalkylphosphorane sind über Spirophosphonium-Salze zugänglich, deren Stereochemie hier durch Bestimmung mehrerer Kristallstrukturen und durch quantenchemische Berechnungen einer ausführlichen Konformationsanalyse unterzogen wurde. Als potentielle Edukte für Pentavinylphosphoran wurden in einer vielstufigen Synthese erstmals Tetravinylphosphonium-Salze [Vi4P]X dargestellt, das gesuchte Vi5P erwies sich aber experimentell und nach Rechnungen thermodynamisch instabil in Bezug auf mehrere plausible Zerfallswege. Gleiches gilt für Penta(heteroaryl)phosphorane PR5 (R = 2-Thienyl, 2-Furyl), während die analogen Arsorane AsR5 gut zugänglich sind.The dissertation is devoted to the chemistry of phosphoranes, a particular class of hypervalent compounds containing five P-C bonds that are only able to be synthesized under specific conditions. Simple pentaalkylphosphoranes are accessible via spirophosphonium salts, whose stereochemistry has in this work been subject to a thorough conformational analysis by means of quantum-chemical calculations and determination of several crystal structures. Tetravinylphosphonium salts [Vi4P]X were prepared for the first time, using a multistep synthesis, as potential starting materials for pentavinylphosphorane, but the desired Vi5P proved to be thermodynamically unstable both experimentally and theoretically with respect to several plausible decomposition pathways. The same is true for penta(heteroaryl)phosphoranes PR5 (R = 2-thienyl, 2-furyl), while the analogous arsoranes AsR5 are readily accessible

Tricarbonyl­chlorido{N-[2-(diphenyl­phosphino)benzyl­idene]benzyl­amine-κ2 N,P}rhenium(I) dichloro­methane solvate

In the crystal structure of the title compound, [ReCl(C26H22NP)(CO)3]·CH2Cl2, the ReI atom exhibits a distorted octa­hedral environment defined by a facial arrangement of three carbonyl groups, a Cl atom and an N-[2-(diphenyl­phosphino)benzyl­idene]benzyl­amine ligand. The compound crystallizes with one CH2Cl2 mol­ecule per asymmetric unit. The benzyl­amine ligand and the ReI centre form a non-planar six-membered chelate ring

Tetra­kis(triphenyl­arsine)copper(I) hexa­fluoridophosphate

In the crystal structure of the title compound, [Cu(C18H15As)4]PF6, the Cu atom is coordinated by four As atoms of triphenyl­arsine ligands in a tetra­hedral geometry. The complex cation is located on a crystallographic threefold axis. Both PF6 − anions are located on special positions of site symmetry . The Cu—As bond of the independent arsine ligand is shorter than the Cu—As bonds of the three symmetry-related arsine ligands

{Bis[2-(diphenyl­phosphan­yl)phen­yl] ether-κ2 P,P′}(1,1′-dibenz­yl-1H,1′H-4,4′bi-1,2,3-triazole-κ2 N3,N 3′)copper(I) hexa­fluorido­phosphate dichloro­methane hemisolvate

In the crystal structure of the title compound, [Cu(C18H16N6)(C36H28OP2)]PF6·0.5CH2Cl2 or [Cu(DPEPhos)(Bn-bta)]PF6·0.5CH2Cl2 {DPEPhos = bis­[(diphenyl­phosphan­yl)phen­yl] ether and Bn-bta = 1,1′-dibenzyl-1H,1′H-4,4′-bi-1,2,3triazol­e}, the Cu atom is coordinated by two N and two P atoms of the ligands in a strongly distorted tetra­hedral environment. There are two crystallographically independent complex cations present, which differ significantly in their geometrical parameters. The solvent molecule is disordered but satisfactory atomic positions could not be determined

Isothiourea-catalyzed enantioselective functionalisation of glycine Schiff base aryl esters via 1,6- and 1,4-additions

The St Andrews team thanks the EPSRC Centre for Doctoral Training in Critical Resource Catalysis (CRITICAT, grant code EP/L016419/1) (RC) for funding. The Linz team gratefully acknowledges generous financial support by the Austrian Science Funds (FWF) through project No. P31784.The enantioselective α-functionalisation of glycine Schiff base aryl esters through isothiourea catalysis is successfully demonstrated for 1,6-additions to para-quinone methides (21 examples, up to 95 : 5 dr and 96 : 4 er) and 1,4- additions to methylene substituted dicarbonyl or disulfonyl Michael acceptors (17 examples, up to 98 : 2 er). This nucleophilic organocatalysis approach gives access to a range of α-functionalised α-amino acid derivatives and further transformations of the activated aryl ester group provide a straightforward entry to advanced amino acid-based esters, amides or thioesters.Publisher PDFPeer reviewe

Green-light photocleavable meso-methyl BODIPY building blocks for macromolecular chemistry

We report the design of easily accessible, photocleavable meso-methyl BODIPY monomers suitably functionalised for incorporation into macromolecules. Firstly a BODIPY-diol as a novel AA-type bifunctional monomer is reported. Secondly, from the same common BODIPY precursor, a clickable, azide functionalised AB-type hetero-bifunctional monomer was prepared. Photochemical studies of model compounds confirmed the ability of these compounds to undergo photocleavage in green light (lambda > 500 nm). Their usefulness for photoclippable macromolecular systems is then demonstrated: firstly by incorporating the diols into polyurethane hydrogels shown to undergo photocleavage and hence dissolution under visible light irradiation and secondly, the preparation of water-soluble macromolecular photocages able to photorelease small molecules. Thus the results presented herein describe a proof-of-principle for BODIPY-based photoresponsive materials, for example, for use as degradable polymers, sacrificial materials for lithography or for the delivery of caged pharmaceuticals

Diiodido-bis{<i>N</i>-[2-(diphenylphosphino)benzylidene]benzylamine-κ²<i>N</i>,<i>P</i>}dicopper(I)

The one-pot template reaction between 2-(diphenylphosphino)benzaldehyde, benzylamine and copper(I) iodide yields the dinuclear copper complex (P∩N)2Cu2I2, as revealed by single-crystal X-ray diffraction