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Lisanne Becker, Perdita Arndt, Anke Spannenberg, Uwe Rosenthal
The reactions of the Group 4 metallocene alkyne complexes rac-(ebthi)M(η(2) -Me3 SiC2 SiMe3 ) (1 a: M=Ti, 1 b: M=Zr; rac-(ebthi)=rac-1,2-ethylene-1,1'-bis(η(5) -tetrahydroindenyl)) with PhCN were investigated. For 1 a, an unusual nitrile-nitrile coupling to 1-titana-2,5-diazacyclopenta-2,4-diene (2) at ambient temperature was observed. At higher temperature, the CC coupling of two nitriles resulted in the formation of a dinuclear complex with a four-membered diimine bridge (3). The reaction of 1 b with PhCN afforded dinuclear compound 4 and 2,4,6-triphenyltriazine...
September 22, 2014: Chemistry: a European Journal
Rashidat O Ayinla, Laurel L Schafer
Intermolecular hydroamination of heteroatom-substituted allenes with a bulky arylamine was carried out using a bis(amidate) bis(amido) titanium(IV) complex (1) as a precatalyst. The reaction of 2,6-dimethylaniline with oxygen-substituted allene 2c or 2d in the presence of complex 1 gives the ketimine regioisomer as the exclusive product. Reduction of such ketimine products resulted in the formation of amino ethers that were further employed as proligands for the formation of N,O-chelating five-membered titana- and zirconacycles...
August 14, 2011: Dalton Transactions: An International Journal of Inorganic Chemistry
A Kavetskiy, G Yakubova, Q Lin, D Chan, S M Yousaf, K Bower, J D Robertson, A Garnov, D Meier
Beta particle surface fluxes for tritium, Ni-63, Pm-147, and Sr-90 sources were calculated in this work. High current density was experimentally achieved from Pm-147 oxide in silica-titana glass. A 96 GBq (2.6 Ci) Pm-147 4pi-source with flux efficiency greater than 50% was used for constructing a direct charge capacitor with a polyimide coated collector and vacuum as electrical insulation. The capacitor connected to high resistance (TOmega) loads produced up to 35 kV. Overall conversion efficiency was over 10% (on optimal load)...
June 2009: Applied Radiation and Isotopes
Uwe Rosenthal, Vladimir V Burlakov, Marc A Bach, Torsten Beweries
In these days a renaissance of metallacycles as an increasingly important class of organometallic compounds for synthetic and catalytic applications is evident, making such very attractive for a plethora of investigations. Titanocene and zirconocene bis(trimethylsilyl)acetylene complexes, regarded as three-membered metallacycles (1-metallacyclopropenes), present a rich chemistry towards unsaturated molecules. By elimination of the alkyne these complexes form by reaction with unsaturated compounds five-membered titana- and zirconacycles, all of which are relevant to stoichiometric and catalytic C-C coupling and cleavage reactions of unsaturated molecules...
May 2007: Chemical Society Reviews
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