[reaction: see text]. The copper iodide-catalyzed cross-coupling of terminal alkynes with hypervalent iodonium salts was accomplished with CuI (10 mol %) and NaHCO3 (2 equiv) in DME/H2O (4:1) at room temperature for 30 min to afford arylalkynes or enynes under mild conditions.

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A new procedure for the synthesis of b-hydroxy enones from allenyl carbinols and aldehydes is described. The use of InCl 3 to promote reaction results in a mild and convenient protocol for the preparation of b-hydroxy enones.

Cognitive Radio(CR) is the technology that allocates the frequency by using dynamic spectrum access. We proposed a model to calculate the optimal level of the cognitive radiotelegraph, where secondary users opportunistically share the spectrum with primary users through the spectrum sensing. When secondary user with cognitive radio detects the arrival of a primary user in its current channel, the secondary user moves to the idle channel or be placed in the virtual queue. We assume that the primary users have finite buffers and the population of secondary users is finite. Using a two-dimensional Makov model with preemptive priority queueing, we could derive the blocking and waiting probability as well as the optimal level of cognitive radiotelegraph under a various range of parameter circumstances.

Ketones Ketones Q 0350 A Novel Coupling Reaction of Allenyl Carbinols with Aldehydes Mediated by InCl 3 via a 1,3-Transposition ofOxygen. -A novel synthesis of aldol products (III) is described utilizing the InCl3-catalyzed coupling of allenyl carbinols and aldehydes. -(YU*, C.-M.; KIM, Y.-M.; KIM, J.-M.; Synlett 2003, 10, 1518-1520; Dep. Chem., Sung Kyun Kwan Univ., Suwon 440-746, S. Korea; Eng.) -Mais 50-091