Reactions of the berylliumd ihalidec omplexes [BeX 2 (OEt 2 ) 2 ]( X= Br or I) with N,N,N',N'-tetramethylethylenediamine (TMEDA), as eries of diazabutadienes, or bis(diphenylphosphino)methylene (DPPM) have yielded the chelated complexes, [BeX 2 (TMEDA)],[ BeX 2 {(RN = CH) 2 }] (R = tBu, mesityl (Mes), 2,6-diethylphenyl (Dep) or 2,6-diisopropylphenyl (Dip)), and the non-chelated system, [BeI 2 (k 1 -P-DPPM) 2 ]. Reactions of lithium or potassium salts of av ariety of b-diketiminates have given both three-coordinate complexes, [{HC(RCNAr) 2 }BeX] (R = Ho rM e; Ar = Mes, Dep or Dip;X= Br or I);a nd four-coordinate systems, [{HC(MeCNPh) 2 }-BeBr(OEt 2 )] and [{HC(MeCNDip)(MeCNC 2 H 4 NMe 2 }BeI].A lkali metal salts of ketiminate, guanidinate, boryl/phosphinosilyl amide, or terphenyl ligands, lead to dimeric[ {BeI{m-[(OCMe)(-DipNCMe)]CH}} 2 ], and monomeric [{iPr 2 NC(NMes) 2 }BeI(OEt 2 )], [k 2 -N,P-{(HCNDip) 2 B}(PPh 2 SiMe 2 )NBeI(OEt 2 )] and [{C 6 H 3 Ph 2 -2,6}BeBr(OEt 2 )],r espectively.C ompound [{HC(MeCNPh) 2 }-BeBr(OEt 2 )] undergoes aS chlenk redistributionr eaction in solution, affordingt he homoleptic complex, [{HC(MeCNPh) 2 } 2 Be].T he majority of the prepared complexes have been characterizedb yX -ray crystallography and multinuclear NMR spectroscopy.T he structures and stability of the complexes are discussed, as is their potential for use as precursors in poorly developed low oxidationstate beryllium chemistry.