Coles M.P.Sözerli S.E.Smith J.D.Hitchcock P.B.2025-04-102025-04-102007http://hdl.handle.net/20.500.14701/51928Single-crystal X-ray diffraction of MC(SiMe3) 2(SiMe2hpp) (M = Li, K; hppH = 1,3,4,6,7,8,-hexahydro-2H- pyrimido[1,2-a]pyrimidine) showed nonsolvated organometallic compounds in which the iminonitrogen of the guanidine forms strong intramolecular bonds to generate six-membered metallacycles. © 2007 American Chemical Society.Article10.1021/om700963c