A transition-metal-free
and environmentally friendly synthesis
method for bromobenzothiazines through tandem C–H amination/bromination
was reported. This reaction contains both intramolecular C–H
amination and site-selective electrophilic bromination of arenes with
NaBr as the bromo source, PhI(OAc)2 or K2S2O8 as the oxidant, and H2O as the only
solvent.
Visible light-mediated
cascade remote oxyfluoroalkylation of alkenes
under mild conditions is developed for the first time. The key point
of this transformation is the incorporation of alkene fluoroalkylation-initiated
remote benzyl C–H bond activation via a 1,5-H shift in a highly
controlled site-selective manner and Kornblum reaction with dimethyl
sulfoxide as the oxidant. With this method, a broad array of fluoroalkyl
groups were introduced into a double bond to produce 1,6-fluoroalkylated
ketones at room temperature.
Herein, we report a palladium-catalyzed relay Heck-type reaction of fluoroalkyl bormide and terminal alkenes. The reaction involves fluoroalkylation of alkenes and migration of double bonds via 1,5-hydrogen atom transfer strategy....
Student Member, Xuming FANG †b) , and Zhengguang ZHAO †c) , Nonmembers SUMMARY Continuously increasing the bandwidth to enhance the capacity is impractical because of the scarcity of spectrum availability. Fortunately, on the basis of the characteristics of the multihop cellular networks (MCNs), a new compact frequency reuse scheme has been proposed to provide higher spectrum utilization efficiency and larger capacity without increasing the cost on network. Base stations (BSs) and relay stations (RSs) could transmit simultaneously on the same frequency according to the compact frequency reuse scheme. In this situation, however, mobile stations (MSs) near the coverage boundary will suffer serious interference and their traffic quality can hardly be guaranteed. In order to mitigate the interference while maintaining high spectrum utilization efficiency, this paper introduces a fractional frequency reuse (FFR) scheme into multihop cellular networks, in which the principle of FFR scheme and characteristics of frequency resources configurations are described, then the transmission (Tx) power consumption of BS and RSs is analyzed. The proposed scheme can both meet the requirement of high traffic load in future cellular system and maximize the benefit by reducing the Tx power consumption. Numerical results demonstrate that the proposed FFR in compact frequency reuse achieves higher cell coverage probability and larger capacity with respect to the conventional schemes.
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