Dalton Transactions

doi: 10.1039/b914810hpmid: N/A

doi: 10.1039/b914811fpmid: N/A

doi: 10.1039/b914812bpmid: N/A

Ragaini, Fabio

doi: 10.1039/b902425ppmid: 19655055

Recent progress, with some emphasis on the author's own work, on the understanding of the mechanism of the reductive carbonylation of nitroarenes and of the oxidative carbonylation of amines is discussed, highlighting the close connection between the two reactions and trying to unify scattered data in the literature. Isocyanates, carbamates and ureas can be obtained by either procedure, without the need for the use of the toxic and corrosive phosgene.

Selander, Nicklas; Szabó, Kálmán J.

doi: 10.1039/b903115dpmid: 19655056

Palladium pincer-complexes readily catalyze the formation of allylstannanes, allenylstannanes/silanes and allylboronates from easily available allylic and propargylic substrates and dimetallic reagents. The catalytic activity and selectivity of the pincer-complexes can efficiently be fine-tuned by changing the heteroatoms in the side arms. Pincer-complexes with nitrogen, sulfur and selenium atoms in the side arms are very efficient for creating C–Sn, C–Si and C–B bonds, while phosphorus based complexes can be employed for catalytic cleavage of C–Sn and C–B bonds. Most of the catalytic metallation (stannylation and borylation) processes can easily be combined with other reactions, and thus one-pot procedures can be designed for the synthesis of homoallylic alcohols, homoallylic amines and α-amino acids from simple precursors.

Willner, Alexander; Neumann, Beate; Stammler, Hans-Georg; Mitzel, Norbert W.

doi: 10.1039/b908176cpmid: 19655057

Hydroxylamine units, bonded via their oxygen atom to a cyclo-pentadienyldimethylsilyl group are transformed into siloxy ligands and hydrazide units by the reaction with tetrakis(dimethylamido)-titanium and -zirconium by the same reaction principle but resulting in different aggregates of the products.

Jauregui, Maite; Perry, William S.; Allain, Clémence; Vidler, Lewis R.; Willis, Michael C.; Kenwright, Alan M.; Snaith, John S.; Stasiuk, Graeme J.; Lowe, Mark P.; Faulkner, Stephen

doi: 10.1039/b911588apmid: 19655058

Himeda, Yuichiro; Miyazawa, Satoru; Onozawa-Komatsuzaki, Nobuko; Hirose, Takuji; Kasuga, Kazuyuki

doi: 10.1039/b908764hpmid: 19655059

Deuterium-labelled compounds were prepared by (transfer) deuterogenation of unsaturated compounds using H2 or HCO2H in acidic D2O as deuterium source with almost quantitative yields and high deuterium contents under mild reaction conditions via heterolytic cleavage of H2 (or decomposition of HCO2H) and rapid H+/D+ exchange using iridium catalysts with 4,4′-dihydroxy-2,2′-bipyridine.

Fitzgerald, Michael; Pappas, Iraklis; Zheng, Chong; Xie, Zai-Lai; Huang, Xiao-Ying; Tao, Songtao; Pan, Long

doi: 10.1039/b912160apmid: 19655060

A discrete, hexanuclear zirconium metallocycle has been synthesized, isolated, and characterized by single-crystal X-ray diffraction. It is sustained in a chair-like conformation by glycolic acids. Formation and growth of the complex has been observed using in situ time-resolved dynamic light scattering measurements.

Liu, Gao-Feng; Dürr, Katharina; Puchta, Ralph; Heinemann, Frank W.; van Eldik, Rudi; Ivanović-Burmazović, Ivana

doi: 10.1039/b906100mpmid: 19655061

We have synthesized and characterized two Mn(II) seven-coordinate complexes with N5 pentadentate ligands, which contain hydrazone and hydrazide groups respectively. We have shown that insertion of hydrazido (amido) groups into the ligand sphere increases the negative charge of the chelate, without changing a donor atom set and coordination geometry, and radically modulate a redox activity of seven-coordinate manganese complexes, which is important for the function of manganese as a superoxide dismutase catalytic center.