An alkylzinc bromide and a lithium alkyldibromozincate containing tris(organosilyl)methyl groups

Structural Organozinc Chemistry

“…Solid state structure of the RZnBr 2 Li(THF) 2 aggregate 128 (THF) 2 (128) (Figure 65) 202 . In this compound two bromine atoms are bridging between zinc and lithium.…”

“…The dimeric zinc amide derived from adamantylamine was isolated and structurally characterized as an adduct containing one molecule of coordinated THF and one molecule of coordinated adamantylamine (202) (Figure 97) 284 between the two amido nitrogen atoms, which are linked together by two more ethylzinc moieties, via Zn−N bonds, into a puckered eight-membered ring of alternating nitrogen and zinc atoms (Figure 99) 288 . One of the cyclohexyl fragments is located below that ring and the other one above it.…”

Synthesis and crystal structures of some cobalt halide derivatives containing alkyl or silanolato groups

“…Those that have been isolated include the Grignard reagent RMgX AE THF [2], the monomeric compounds RMCl (where M = Hg [3], Ge, Sn or Pb [4]), the dimeric halogen-bridged derivatives (RZnBr) 2 and (RCdCl) 2 [3] containing tetrahedrally coordinated metal centres, and (RMCl) 2 , (where M = Cr [2] or Pd [5]) with square planar coordination at the metal. Some dimeric compounds containing the related ligand R 0 = C(SiMe 3 ) 2 (SiMe 2 NMe 2 ) viz R 0 MBr (M = Co [6] or Zn [7]) and R 0 MnCl [6] have also been reported.…”

An Organozinc Hydride Cluster: An Encapsulated Tetrahydrozincate?

“…[17] The neutral compound, RH (R = C(SiMe 3 ) 2 -(SiMe 2 hpp)) is readily converted into the organolithium reagent RLi, which we have used as a ligand-transfer reagent in the synthesis of the alkylzinc bromide ZnRBr (5). Compound 5 is a member of a series of compounds [(Zn{C-(SiMe 3 ) 2 (SiMe 2 L)}Br) 2 ] (L = NMe 2 , [18] 2-pyridyl, [19] or hpp) in which the metallacycle increases sequentially from a four-to a five-to a six-membered ring ( Figure 2).…”