By EDWARD HOPE. IN connexion with work on the addition of hydrogen cyanide to the esters of cyanoglutaconic acids, described in the following paper, some observations on the behaviour of ethyl a-c yano-p-methylglutaconate and two isomeric methyl homologues were made, which throw some light on the constitution of the latter two substances. Ethyl a-cyano-P-methylglutaconate was first made by Rogerson and Thorpe (T., 1905, 87, 1669) by the condensation of ethyl acetoacetate with ethyl sodiocyanoacetate, and the constitution CO,Et*CH(CN)*CMe:CH*CO,Et was assigned to it. This ester forms alkali derivatives, which received formule such as C02E t *CK(CN) CMe: CH*CO,E t , and to the me thy1 derivative obtained from these by the action of methyl iodide was assigned the constitution C02Et*CMe(CN)-CMe:CH*C02Et (I), this substance being
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