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Reactions of the beryllium dihalide complexes BeX2 (OEt2) 2 (X=Br or I) with N, N, N', N'-tetramethylethylenediamine (TMEDA), a series of diazabutadienes, or bis (diphenylphosphino) methylene (DPPM) have yielded the chelated complexes, BeX2 (TMEDA), BeX2 (RN=CH) 2 (R=tBu, mesityl (Mes), 2, 6-diethylphenyl (Dep) or 2, 6-diisopropylphenyl (Dip) ), and the non-chelated system, BeI2 (κ1 -P-DPPM) 2. Reactions of lithium or potassium salts of a variety of β-diketiminates have given both three-coordinate complexes, HC (RCNAr) 2 BeX (R=H or Me; Ar=Mes, Dep or Dip; X=Br or I) ; and four-coordinate systems, HC (MeCNPh) 2 BeBr (OEt2) and HC (MeCNDip) (MeCNC2 H4 NMe2 BeI. Alkali metal salts of ketiminate, guanidinate, boryl/phosphinosilyl amide, or terphenyl ligands, lead to dimeric BeI{μ-[ (OCMe) (DipNCMe) CH}2 ], and monomeric iPr2 NC (NMes) 2 BeI (OEt2), κ2 -N, P- (HCNDip) 2 B (PPh2 SiMe2) NBeI (OEt2) and C6 H3 Ph2 -2, 6BeBr (OEt2), respectively. Compound HC (MeCNPh) 2 BeBr (OEt2) undergoes a Schlenk redistribution reaction in solution, affording the homoleptic complex, HC (MeCNPh) 2 2 Be. The majority of the prepared complexes have been characterized by X-ray crystallography and multi-nuclear NMR spectroscopy. The structures and stability of the complexes are discussed, as is their potential for use as precursors in poorly developed low oxidation state beryllium chemistry.
Paparo et al. (Thu,) studied this question.