70122-99-5Relevant articles and documents
SYNTHESIS AND SOME PROPERTIES OF 1,1-DI(ALKOXYCARBONYLAMINO)-2,2-DIHALOGENO- AND 1,1-DI(ALKOXYCARBONYLAMINO)-2,2,2-TRIHALOGENOETHANES
Bal'on, Ya. G.,Smirnov, V. A.
, p. 2249 - 2254 (2007/10/02)
1,1-Di(alkoxycarbonylamino)-2,2,2-trihalogenoethanes were obtained by heating trihalogenoacetaldehydes or their hydrates with urethanes in a ratio of 1:2 in the presence of catalytic amounts of concentrated sulfuric acid.The products were reduced selectively with aluminum amalgam in 90percent alcohol to 1,1-di(alkoxycarbonylamino)-2,2-dihalogenoethanes.Compounds of both types react smoothly with benzene and its homologs in the presence of concentrated sulfuric acid and give 1-alkoxycarbonylamino-1-aryl-2,2-dihalogeno- and 1-alkoxycarbonylamino-1-aryl-2,2,2-trihalogenoethanes respectively.In an alkaline medium the latter are cleaved to aryloxyacetic acid, and with phosphorus pentachloride they form 1-aryl-2,2-dihalogeno- and 1-aryl-2,2,2-trihalogenoethyl isocyanates.