Abstract Cyclopropane were obtained from electron deficient olefins and acid carbon compounds by oxidation by iodine in the presence of KF on alumina. The reaction allows the synthesis of cyclopropanediyldiphosphonates.
Studies on Organophosphorus Compounds; LI. A New and Facile Route to 2-Substituted 1,1-Cyclopropanediylbis(phosphonic acids)
作者:Chengye Yuan、Chaozhong Li、Yixiang Ding
DOI:10.1055/s-1991-26591
日期:——
Reaction of bromomethylenebis(phosphonates) 1 with electrondeficient alkenes 2a-d as Michael acceptors in the presence of thallium(I) ethoxide leads to a new and facile route to 2-substituted 1,1-cyclopropanediylbis(phosphonates) 3 in satisfactory yield. These are converted into the corresponding free acids 7 by treatment with chlorotrimethylsilane in the presence of potassium iodide followed by treatment with water. The products resulted from bromomethylenebis(phosphonates) 1 and other alkenes 2e, f and methyl vinyl ketone are identified and discussed.