Abstract:The synthesis of 2-amino chromene, reported in our previous paper, has been accomplished by the reaction of cyanoiminocoumarin and β-naphthol. The obtained compound was reacted with various electrophilic or nucleophilic reagents. All the new homologous 2-amino-4H-chromenes have been characterized on the basis of their spectral (IR, 1 H and 13 C NMR) data and microanalysis. Four compounds were evaluated in vitro for their preliminary antibacterial activities against five different pathogenic bacterial strains such as Bacillus thuringiensis, Escherichia coli, Staphylococcus aureus, klebsiella pneumonia and Salmonella Sp. Antibacterial activity of each compound was compared with standard drug, Penicillin.

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The aim of this paper is to establish new transcendence criteria of p-adic continued fractions. We prove that a p-adic number whose sequence of partial quotients is bounded in Qp and begins with arbitrarily long palindromes is either quadratic or transcendental.

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