Photochemical formation and reversible base-induced cleavage of a phosphagallene.

The reactivity of Cp*Ga (Cp* = CMe) towards phosphanylidenephosphoranes of the type TerP(PMe) (Ter = Ter 2,6-(2,6-iPrCH)CH), Ter 2,6-(2,4,6-iPrCH)CH was investigated. While no thermal reaction was observed (in line with DFT results), irradiation at 405 nm at low temperatures resulted in the formation of phosphagallenes TerP = GaCp* (1a) and TerP = GaCp* (1b) accompanied by release of PMe. When warming the reaction mixture to ambient temperatures without irradiation, the clean re-formation of TerP(PMe) and Cp*Ga in a second-order reaction was observed.

1-[(Methyl-sulfon-yl)-oxy]pyridin-1-ium methane-sulfonate.

The title mol-ecular salt, CHNOS·CHOS, consists of a cationic sulfonated pyridine -oxide moiety and a methane-sulfonate anion. An N-O bond length of 1.4004 (15) Å is observed in the cation.

Photomediated Hydro- and Deuterodecarboxylation of Pharmaceutically Relevant and Natural Aliphatic Carboxylic Acids.

Herein, we report a photomediated hydro- and deuterodecarboxylation of different primary, secondary, and tertiary carboxylic acids catalyzed by an organic pyrimidopteridine photoredox catalyst. The reaction was optimized by a statistical design of experiment (DoE). Under optimized reaction conditions, the conversion of commercially available nonsteroidal anti-inflammatory drugs (NSAIDs) in tablet form and on gram scale was realized.

Pyrimidopteridine-catalyzed Photo-mediated Hydroacetoxylation.

Herein we report a photo-mediated formal addition of carboxylic acids to activated alkenes catalyzed by a pyrimidopteridine photoredox catalyst. The decarboxylation of aliphatic carboxylic acids upon single-electron oxidation is countered in the presence of electron-rich alkenes and a hydroacetoxylation is observed. Mechanistic proposals have been made based on CV measurements, competitive Stern-Volmer quenching and EPR experiments.

Synthesis, Coordination Chemistry, and Mechanistic Studies of P,N-Type Phosphaalkene-Based Rh(I) Complexes.

The synthesis of P,N-phosphaalkene ligands, py-CH═PMes* (, py = 2-pyridyl, Mes* = 2,4,6-Bu-CH) and the novel quin-CH═PMes* (, quin = 2-quinolinyl) is described. The reaction with [Rh(μ-Cl)cod] produces Rh(I) bis(phosphaalkene) chlorido complexes and with distorted trigonal bipyramidal coordination environments. Complexes and show a pronounced metal-to-ligand charge transfer (MLCT) from Rh into the ligand P═C π* orbitals.