Spectra of Usnic Acid Derivatives 4067 ammonia and then dried with sodium carbonate and distilled.Eb.-The remainder of the lower layer from Ea was dried with sodium carbonate and distilled.F. -The procedure was the same as Eb except that an equimolar amount of water was added dropwise to the bromopentane during the hydrogen bromide addition.G. -Moist air was blown through phosphorus tribromide for eight hours at room temperature. The residue was warmed for 20 minutes on the steam-bath. The bromopentane was added to this cooled material and the stoppered flask was kept in a Dry Ice-acetone-bath for two days and at
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