R. Polo et al., REACTION OF ALKYNYL ALKOXY METAL (CR, W) CARBENE COMPLEXES WITH 1,3-DINITROGEN SYSTEMS - A DIRECT ENTRY TO THE PYRIMIDINE SKELETON, Organometallics, 17(11), 1998, pp. 2135-2137
The reaction of alkynyl alkoxy metal (Cr, W) carbene complexes with 1,
3-dinitrogen systems (amidines, guanidines, ureas) is described. In al
l cases, the main product obtained corresponds to the cycloadduct whos
e cyclic structure may be related to a pyrimidinic ring arising from a
formal [3 + 3] cycloaddition, between the metal carbene complexes and
the dinitrogen systems.