Our recent work on the regioselective synthesis of a number of heterocycles (4) prompted us to search for a simple and effi- cient reagent for this heterocyclization. We have recently achieved a facile entry to this ring system 6 (5) with the use of a well-known brominating agent, pyridine hydrobromide per- bromide, which we report here.
Voice VLAN. 1  Voice VLAN allows you to enhance VoIP service by configuring ports to carry IP voice traffic from IP phones on a specific VLAN. VoIP traffic has a preconfigured OUI prefix in the source MAC address. 2  You can configure VLANs on which voice IP traffic is forwarded.
Need to create access lists to block or permit users belonging to different groups and exist on separate subnets to communicate with their peers. 2. People with different rights cannot exist on the same LAN, because they are on a separate subnets. So VLAN allows you to create multiple groups on the same LAN. While allowing the same group to exist across different LANs and Networks