Hexachlorodisilylmethane, obtained by the direct synthesis from methylene chloride and silicon, was alcoholysed to get hexaethoxydisilylmethane; the latter was, in turn, converted by Grignardization to five monomeric methyl. ethoxydisilylmethanes, containing from one to five methyl groups. It was found that the even-numbered, symmetrically substituted monomers gave better yields. These monomers were hydrolysed in the presence of diluted hydrochloric acid and ether. Only the pentafunctional monomer gave an insoluble and infusible cross-linked polymer, the trifunctional monomer gave in part a linear polymer, and all the other monomers gave ringed, fused-ringed or caged oligomers. The co-hydrolysis of a mixture of di-and tetra-functional monomers gave also a fused-ring oligomer. The structures of these products were elucidated and discussed. From the results, it is evident that the strong tendency of disilmethosiloxane to ring closure reduces the functionality of the polyfunctional monomers with the result of oligomer formation.