El-Hamruni S.M.Sözerli S.E.Smith J.D.Coles M.P.Hitchcock P.B.2024-07-222024-07-22201400049425http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/16933The structure of a triclinic form of the organolithium derivative LiR, R≤C(SiMe3)2(SiMe2{hpp}) (1) (hppH≤1,3,4,6,7,8,-hexahydro-2H-pyrimido[1,2- a]pyrimidine) comprises dimers [1]2 held together by Li··· H3C interactions like those in the polymeric structure [1]∞ of the previously described orthorhombic form. Compound 1 reacts with the chlorides MCl2 (M≤Hg or Sn) to give compounds HgRCl (2) or SnRCl (3), which have been characterised by NMR spectroscopy and X-ray crystallography. The structural parameters and conformations of the metallacycles MRLn are compared with those in related compounds containing bulky organosilicon ligands with pendant nitrogen donors. Compound 3 reacts with Li[P{H}Ar*] (Ar*≤2,4,6- tBu3C6H2) to give the crowded phosphanide SnR(P{H}Ar*) (4). © CSIRO 2014.EnglishChlorine compoundsLithiumNuclear magnetic resonance spectroscopyOrganometallicsTinX ray crystallographyNitrogen donorsOrganolithiumsOrganosiliconesOrthorhombic formsPolymeric structuresRelated compoundsStructural parameterTriclinic formsLigandsArticle10.1071/CH14255