Synthesis of 1,1-di-tert-Butyl-2-ethyl ethanetricarboxylate and 1,1-di-tert-Butyl-3-ethyl propanetricarboxylate

The synthesis of 1,1-dii-tert-butyl-2-ethyl ethanetricarboxylate (I) and 1,1-di-tert-butyl-3-ethyl propanetricarboxylate (II) is described. The ·reaction of ,di-tert-butyl malonate w i th ethyl bromoacetate gives I, and the Michael condensation between di-tert-butyl malonate and ethyl acrylate gives II. In both cases the yields are very good