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A novel crystalline, air-and moisture-stable Pd salt, Pd(N,N-dimethyl b-alaninate) 2 , was synthesized. This salt was demonstrated to constitute a low-priced, phosphine-free, yet highturnover-number (TON = 10 4 ) catalyst for the Suzuki reactions of various aryl bromides and iodides under mild and simple reaction conditions. Moreover, it was observed that the presence of an olefin could dramatically hamper the Suzuki reaction.

The development of economic has cause many problems about emerging and dense concentration of High-rise buildings in Baotou,so that the urban natural environment, urban living environment, urban spatial structure ,the urban cultural environment have been greatly affected.Therefore, this article discusses the problem about high-rise buildings from the perspective of the urban environment, with an aim to find a harmonious development method on high-rise buildings and urban environment.

Hydrazines Q 0150Copper-Mediated Synthesis of N,N'-Diarylhydrazines from Boronic Acids. -The method proceeds under mild conditions and tolerates substrates with different functional groups. -(WANG, Y. F.; ZHOU, Y.; WANG, J. R.; LIU, L.; GUO*, Q. X.; Chin.

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