A solution-processable bipolar material tBu-OXDTFA comprising an electron-rich triphenylamine core and electron-deficient oxadiazole/fluorene peripheries was synthesized. This dendrimer-like molecule not only possesses a high triplet energy (2.74 eV) but also exhibits excellent film-forming properties upon solution processing. We achieved highly efficient white electrophosphorescent OLEDs (22.3 cd A À1 , 11.6%) through solution processing, wherein the single white emitting layer was readily formed after spin-coating a solution of blue-and red-phosphor co-dopants containing tBu-OXDTFA as the host matrix.Scheme 1 Synthesis route to tBu-OXDTFA and chemical structures of Flrpic and Os(fppz).

By developing a small amplitude soliton approximation method, we study analytically weak nonlinear excitations in cigar-shaped condensates with repulsive interatomic interaction under consideration of external perturbation potential. It is shown that matter wave solitons may exist and travel over a long distance without attenuation and change in shape by properly adjusting the strength of interatomic interaction to compensate for the effect of external perturbation potential.

A highly efficient methylenecyclopentane annulation process has been developed based on the Pd(II)-mediated oxidative cyclization of omega-unsaturated alpha-cyano ketones, readily accessed via the Michael addition of 3-butenylmagnesium bromide with 2-cyano-2-cycloalkenones.

A stereoselective synthesis of 2-isocyanoallopupukeanane (3) in ca. 5% overall yield features an intramolecular Diels−Alder reaction to establish a bridged cyclopentane ring to the existing bicyclo[3.2.1]octane unit.

Ring closure reactionsRing closure reactions O 0130 Palladium(II) Acetate Mediated Oxidative Cyclization of ω-Unsaturated α-Cyano Ketones. A Facile Methylenecyclopentane Annulation Process. -ω-Unsaturated α-cyano ketones, readily available via the Michael addition of 3-butenylmagnesium bromide (II) with 2-cyano-2-cycloalkenones undergo an efficient methylenecyclopentane annulation process to give bicyclic α-cyano ketones. -(KUNG, L.-R.; TU, C.-H.; SHIA, K.-S.; LIU*, H.-J.; Chem.