Organic 2 Review Problem 102

Organic 2 Review Problem 102 - 86 P RACTICAL ORGANIC...

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

View Full Document Right Arrow Icon
86 PRACTICAL ORGANIC CHEMISTRY Acetylene. C 2 H 2 . Acetylene can be readily obtained by the action of water on calcium car- bide: since, however, commercial calcium carbide contains traces of calcium CaC 2 -f- 2HOH = Ca(OH) 8 + C 2 H 2 sulphide, phosphide and nitride, the acetylene should be purified before use. If a specially pure sample of acetylene is required, it should be obtained by the action of alcoholic potassium or sodium hydroxide on i,2-dibromoethane: this reaction should be compared with that of aqueous potassium or sodium hydroxide, which merely hydrolyses i,2-dibromoethane to ethylene glycol. C 2 H 4 Br 2 - aKOH (ethanolic) CJI 2 -f aKBr - 2H 2 O C 2 H 4 Br 2 + 2KOH (aqueous) = C 8 H 4 (OH) 1 -f zKBr If acetylene is required either in large quantities or in a steady regular current for several hours, it should be obtained from a cylinder, in which the acetylene is compressed in acetone solution. The cylinders can be purchased and when empty can then be exchanged for refilled ones. The acetylene in
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