SummaryThe aims of this contribution are to present a straightforward synthesis of 2nd generation Hoveyda-type olefin metathesis catalysts bearing bromo and iodo ligands, and to disclose the subtle influence of the different anionic co-ligands on the catalytic performance of the complexes in ring opening metathesis polymerisation, ring closing metathesis, enyne cycloisomerisation and cross metathesis reactions.

It is shown that the highly complex crystal structure of [AgIJ4-(pyrrolidin-1-yl)pyridine) 2 ]NO 3 •1/2H 2 O, 1, with 12 symmetryindependent Ag + ions and 96 units of complex ions in a unit cell can be understood by the ubiquitous srs topology, reducing thousands of atom positions into a single geometrical object in one go.

Organometallics ARTICLE coordinates) and absolute ZPVE corrected energies of 2aÀd and d-2a, and a table of NMR GIAO B3LYP/IGLO-III calculated NMR chemical shifts of 2a,c and d-2a. This material is available free of charge via the Internet at http://pubs.acs.org.

Multilayer technology relies heavily on the chemical compatibility of metal and ceramic. This work focuses on the ceramic–electrode interaction between 92Bi0.5Na0.5TiO3–6 BaTiO3–2K0.5Na0.5NbO3 [(Bi0.46Na0.47Ba0.06K0.01)(Nb0.02Ti0.98)O3], a promising actuator material and forerunner to an emerging class of lead‐free actuator materials, and a silver–palladium alloy for inner electrodes, the only currently viable material for the firing temperatures necessary (1100°C). Of special concern was the high content of bismuth in the ceramic since prior investigations suggest that Bi2O3 (as well as various bismuth titanates) used as a fluxor in electroceramics are prone to forming the intermediate‐phase bismuth palladate (Bi2PdO4), which can lead to poor contacting and delamination of multilayer stacks. Remarkably, no evidence of bismuth palladate formation could be found. However, the phase relations of the bulk ceramic have proven to be quite complex. Potassium was being drained out of the bulk ceramic either constituting the secondary phase K4Na2(TiO3)3 in unmodified experiments or evaporating and being replaced by silver in samples in contact with Ag. Mechanisms for the formation of these phases or the lack thereof are proposed. These findings were obtained by XRD, TG‐DSC, and SEM with EDX, and LA‐ICPMS.

Tosylated γ-carbolines (I) are converted into dihydroquinolones (II) by a one-pot reaction via ozone oxidation, reduction of the assumed intermediate ozonide by pyridine, and final cyclization of the formed keto-lactam in the presence of Et3N. Carboline (Ib) affords additionally the unprecedented cinnoline betaine (III). The deprotection of the tosyl group of quinolones (II) is easily achieved to give quinolones (IV), which are selectively brominated at the 3-position. -(MENTEL, M.; PETERS, M.; ALBERING, J.; BREINBAUER*, R.; Tetrahedron 67 (2011) 5, 965-970, http://dx.