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Ground-state Al atoms react with symmetric cyclic and acyclic ethers at 77 K in a rotating cryostat to give a host of mononuclear organoaluminium compounds. Magnetic parameters determined from EPR spectra given by Al atoms and acyclic ethers are consistent with the formation of novel C-C and C-H aluminium atom insertion products. A third species has been tentatively assigned to the product given by Al atom insertion into the C-0 bond. In addition a carboncentred radical is formed by loss of a hydrogen atom from carbon adjacent to the alkoxyl group. In contrast the cyclic ethers are resistant to alumino hydride formation and in most cases a carbon radical resulting from ring opening at the C-0 bond is formed. Mono-and di-ligand complexes, AICether] and AICether], , are tentatively identified and may be the primary intermediates for all the reactions that occur.7 Issued as NRCC no. 31481.

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Adducts of group IB metal atoms to molecular oxygen (Cu02, Ag02, and Au02) have been prepared in a rotating cryostat at 77 K and isolated in adamantane. Electron spin resonance spectra at 10 and 77 K indicate that most of the unpaired spin population in these complexes resides in a tt* orbital on the two oxygen nuclei with low but measurable unpaired s spin population on the metal atom. ESR spectra of mono(dioxygen) complexes enriched in 170 suggest that Cu02 has end-on bonding with magnetically and spatially nonequivalent oxygen atoms and AgOz and AuG2 have side-on bonding with equivalent oxygen atoms.