Organometallic reactions. Part IV. The preparation of bistrialkyltin derivatives of ureas and biurets by the decarboxylation of bistrialkyltin oxide–isocyanate adducts
- 1 January 1966
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society C: Organic
- p. 299-303
- https://doi.org/10.1039/j39660000299
Abstract
Under appropriate conditions of temperature and structure, bistributyltin oxide will react with isocyanates to yield carbon dioxide and the bistributylstannyl-NN′-dialkylureas; these ureas will react further with isocyanate giving bistributylstannyl-NN′N″-trialkylbiurets. By reactions of this type, mixed biurets of the composition RHN·CO·NR′·CO·NR″H have been prepared for the first time. It is suggested that the decarboxylation, and the alternative reaction in which an isocyanurate is formed, involve the allophanate, Bu3Sn·NR″·CO·OSnBu3, as a common intermediate.Keywords
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