Properties and reactions of unsaturated carbenes
The generation, and some properties and reactions, of unsaturated carbenes; (R)2CC=CC: (n=O,1,2) are explored. In particular the following are discussed: na) reaction pathways and transition state geometries of unsaturated carbene—alkene interactions; b) spin multiplicity of extended unsaturated carbenes; c) ylide formation vs. 1,2 vs. 1,4 additions and possible formation of novel persistent diradicals; d) )CC*MLn vs. —CC—; e) formation of strained systems,