Dilithium tetrabromonickelate

Dilithium tetrabromonickelate(Il), LijNiBti. The combination of LiBr (2 equiv.) and NiBr, (I equiv.) dissolves in THF to form a dark green solution of Li2NiBt4. 

Full details on the preparation of urethane derivatives of 3,4-di-O-benzyl-l,2,5,6-tetradeoxy-l,2 5,6-diimino-L-iditol from D-mannitol as well as the 3,4-dideoxy-L- Areo compounds 24 (R = C02 Bu or COiBn), from a hex-3-enitol, have been reported. (See Vol. 28, p. 230, ref. 66 for an earlier report). In both cases l,6-diamino-l,6-dideoxy-2,5-anhydroalditols were minor by-products. V-Boc-L-/V/o-l,2 5,6-bis-aziridino derivatives have proved to be versatile intermediates for the preparation of imino-alditols. For example, treatment of the 3,4-di-O-benzyl compound with diethylaluminium cyanide affords a 1 2 mixture of pyrrolidine 25 piperidine 26, and with dilithium tetrabromonickelate (Li2NiBr4) gives bromo-derivative 27 from which displacement of bromide allows further functionalization. ... 

The stereoselective opening of allylic epoxides with dilithium tetrachlorocuprate (Li2CuCl4) or dilithium tetrabromonickelate (LijNiBr4) has been reported and used to convert the epoxide 96 into the bromoconduritol derivatives 97 and 98 respectively, as potential antiviral agents. ... 

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