A. Alayed

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A series of new coumarin derivatives 4 containing a 4-arylbut-3-en-2-one moiety were synthesized by condensation of 3-acetylcoumarin 1 with aryl aldehydes 2 in chloroform in the presence of piperidine. The interactions of 3-formyl-4-chlorocoumarin (3) with nitrogen-containg nucleophiles leading to the corresponding substituted chromen-[4,3-c]pyrazol-4-ones(More)
Addressing security vulnerabilities and system intrusions can represent a significant administrative overhead in current computer systems. Although technologies exist for both vulnerability scanning and for intrusion detection, the problems typically require some form of human intervention before they can be rectified. Evidence suggests that, in many cases,(More)
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