Organic 2 Review Problem 328

Organic 2 Review Problem 328 - 3 i2 P RACTICAL O RGANIC C...

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3 i2 PRACTICAL ORGANIC CHEMISTRY a calcium chloride guard-tube 16-9 g. of triethyl phosphite and 10 g. of ethyl iodide for 2 hours. Cool the mixture, distil off the ethyl iodide (b.p. 72°) and distil the residue under reduced pressure using a Claisen flask fitted with a good fractionating column. Collect the fraction of b.p. 86-5-88°/16 mm. Yield of the ethylphosphonate, 10-6 g. Phenylarsonic Acid. C 6 H 5 AsO(OH) 2 . (The Bart Reaction.) Arylarsonic acids are most readily prepared by the Bart Reaction, in which a diazonium salt in aqueous solution is run into a solution of sodium arsenite in an excess of sodium carbonate. The addition of copper sulphate to the + _ CeH 6 N 8 Cl + (NaO) 8 As -> C e H 6 AsO(ONa) 2 + N, + NaCl arsenite often induces a more regular effervescence of nitrogen and markedly increases the yield. Arylarsonic acids have usually a very low solubility in cold water. They are however amphoteric, since with, for example, sodium hydroxide they form sodium salts as above and with acids such as hydrochloric acid they form salts
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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.

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