You synthesized barbituric acid in the highest yield to date and thus you were hired right off. now you have an idea for a barbiturate that will act as a sedative without the addictive side effects. your barbiturate replaces one of the methylene hydrogens of barbituric acid with a benzyl group. draw the skeletal structure of the alkyl iodide you would use to react with enolate of diethyl malonate.

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.