Chemistry of organogold compounds I. Syntheses and properties of dihalogold(III) N,N-dialkyldithiocarbamates and dialkylgold(III) N,N-dialkyldithiocarbamates

Abstract

Monomeric dialkylgold(III) N,N-dialkyldithiocarbamates (R2AuSSCNR'2) can be prepared in good yields from monomeric dibromogold(III) N,N-dialkyldithiocarbamates (Br2AuSSCNR'2) and alkylmagnesium halides or dialkylcadmium compounds.

In addition N-ethylpiperidinium tetrachloroaurate can be converted by treatment with alkylmagnesium halides or dimethylcadmium and with sodium N,N-dialkyldithiocarbamates into the corresponding dialkylgold(III) N,N-dialkyldithiocarbamates.

The monomeric dihalogold(III) N,N-dialkyldithiocarbamates can be prepared from the dimeric gold(I) N,N-dialkyldithiocarbamates and equimolecular amounts of bromide or chlorine.

Apparently gold(I) N,N-dialkyldithiocarbamates react also with half the amount of chlorine, bromine or iodine, with formation of products which according to analyses seem to be monohalogold derivatives (XAuSSCNR'2, X = Cl, Br or I). Evidence is given for the absence of a divalent gold atom in these compounds. On the basis of chemical arguments they seem to be molecular compounds of dihalogold(III) and gold(I) derivatives which dissociate in solution.