Lithium salts formaldehyde complexes

As might be expected, the course of the reaction is profoundly altered by inclusion of a lithium cation in the treatment of the complete borohydride salt. Ab initio calculation (Bonaccorsi et al., 1982) shows that LiBH4 in the gas phase is a tightly bound ion pair. The initial step of its reaction with formaldehyde or acetone involves coordination of the lithium to the carbonyl oxygen to give a complex with a linear C=0 Li- B array, at — 210 kJ mol-1 relative to reactants. This does not dissociate to BH 4 and... 

The racemic [Co(azasartacn)]Cl3 l/2CH30H C2H50H complex resulted fi om capping of [Co(taetacn)] + cation with ammonia and formaldehyde in aqueous solution in the presence of lithium carbonate. Only partial separation was achieved when attempts were made to resolve azasarcophaginate [Co(azasartacn)]- + cation into A- and A-forms by lEC. Therefore, the pre-resolved A- and A-[Co(taetacn)](C104)3 semiclathrochelates were used as initial compounds. As result, the A-and A-[Co(azasartacn)]2+ sarcophaginates were isolated as PFe salts and were additionally purified by fractional crystallization from aqueous solution [142]. 

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