Organic 2 Review Problem 398

Organic 2 Review Problem 398 - 382 PRACTICAL ORGANIC...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
382 PRACTICAL ORGANIC CHEMISTRY HCl. The derivative crystallises out immediately: filter off, wash with cold water and recrystailise from boiling water. Long colourless silky needles, m.p. 179°. 5. Copper salt, (a) Add aqueous copper acetate solution to an aqueous solution of glycine. Note the formation of a blue colour which is considerably deeper than the colour of the original copper acetate solution. On heating the solution, blue needles of the copper salt usually separate. (b) Dissolve about 0-5 g. of glycine in about 40 ml. of water and add an excess of freshly precipitated well-washed cupric hydroxide. Boil for 5 minutes and filter while hot into a small evaporating-basin. Concentrate to about half- bulk on a boiling water-bath and then allow to cool: fine blue needles of the copper salt, (NH 2 CH 2 COO) 2 Cu, crystallise out (cf. p. 130). Prepare the cupric hydroxide by dissolving 2 g. of copper sulphate in about ioo ml. of water, and adding with stirring 16 ml. of TV.NaOH solution.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online