R kycp* 2 ( R&YCP*,(complete development of organolanthanide and group 3 organometallic catalysts which includes resolution of these issues thus becomes of paramount importance for their application in selective organic synthesis. The initial aim of our work was to attain a rapid annulation of 1, 5-and 1, 6-dienes with high stereochemical control. Furthermore, we wished to study the compatibility of these catalysts with various ...