... Hemiacetal vinylogs: Versatile synthons. 1993, Tetrahedron Letters more. Duhamel P. , Guillemont J. , Poirier J.-M. , Chabardes P. Aldolisation-type reaction versus Michael-type addition. Hemiacetal vinylogs: Versatile synthons. ... 1993, Tetrahedron Letters more. Pierre D. , Abdallah D. , Jean-Marie P. Synthesis of bicyclic aza-enones via a lewis acid catalysed Michael-type addition with silyl enol ethers bearing a nitrogen atom. ...