PREPARATION, PROPERTIES AND REACTIONS OF METAL-CONTAINING HETEROCYCLES .89. METALLA[N]ORTHOCYCLOPHANE AND METALLA[M.N]ORTHOCYCLOPHANE AS MEDIATORS FOR THE SYNTHESIS OF CYCLIC-KETONES

The reaction of the bis(triflates) ,2-bis[2-(trifluoromethylsulfonylox y)ethyl]benzene (1), 2-bis[3-(trifluoromethylsulfonyloxy)propyl]benzen e (3) and [2-(trifluoromethylsulfonyloxy)ethyl]phenyl}ethane (6), resp ectively, with the carbonyl metalates [M(CO)4]2- (M=Os (a), Ru (b), Fe (c)) results in the formation of the osma-orthocyclophanes 2a, 4a, 7a and 8a, the ruthenacylophane 2b and the ferracyclophanes 2c and 7c, r espectively. Carbon monoxide insertion into the Fe-C sigma bonds of th e ferracycles 2c and 7c, respectively, affords the ketones 3-oxo[5]ort hocyclophane (9) and 3-oxo[5.2]orthocyclophane (11). The structure of 2a was investigated by an X-ray structural analysis. 2a crystallizes i n the monoclinic space group P2(1)/n with Z=4.