(4-Ethoxyphenyl)acetone can be useful in the preparation of tetrakis(phenyl)-1,3-diazatricyclo[3.3.1.13,7]decanone derivatives and tetrakis(phenyl)-1,3-diazatricyclo[3.3.1.13,7]decanol (diazaadamantane) derivatives and determination of their activity as antibacterial agents.