Organic 2 Review Problem 291

Organic 2 Review - P REPARATIONS 275 aqueous sodium hydroxide solution and then add 2 drops of e thyl malonate and shake A violet coloration is p

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

View Full Document Right Arrow Icon
PREPARATIONS 275 aqueous sodium hydroxide solution, and then add 2 drops of ethyl malonate and shake. A violet coloration is produced, rapidly fading to red and eventually to pale yellow. Excess of the malonate discharges the red colour rapidly, giving the yellow solution. Precisely similar results are obtained with ethyl acetoacetate, except that in tests 2 (a) and 2 ( b ) the deep red coloration is produced without a preliminary violet coloration. These coloration changes are given by most compounds which possess the -CH 2 -CO- group: for further examples, see Tests 4 (a) and ( b ) for Ketones, p. 344. SUBSTITUTION DERIVATIVES OF ETHYL MALONATE. Ethyl malonate resembles ethyl acetoacetate in that it gives rise to mono- and di-substituted derivatives in precisely similar circumstances. Thus when ethanolic solutions of ethyl malonate and of sodium ethoxide are mixed, the sodium derivative (A) of the enol form is produced in solution. On boiling this solution with an alkyl halide, e.g.,
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

Ask a homework question - tutors are online