Add time:08/10/2019         Source:sciencedirect.com

The reaction of 1,1′-bis-(chlorocarbonyl)ferrocene (1) with tetrathiadiaza-18-crown-6 (2) gives the dimeric cryptand 1,1″,1′,1″'-bis(1,4,10,13-tetrathia-7,16-diazacyclooctadecane-7,16-diyldicarbonyl)bisferrocene (4) and not the expected monomeric cryptand 3. An X-ray crystal structure study of 4 is reported and shows that the carbonyl groups are mutually cis/trans/cis/trans in the solid state. In solution, however, multinuclear magnetic resonance shows that the molecule is fluxional, and at least two diastereomeric species are detected at low temperatures (below 243 K). The dimeric cryptand can be reduced to 1,1″,1′,1″'-bis(1,4,10,13-tetrathia-7,16-diazacyclo-octadecanedimethylene)bisferrocene (5).

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