The crystal structure of dispiro(fluorene-9,4'-[ 1,3]dithiolane-5',9"-fluorene), C27H18S2, is reported. The C4--C5 bond connecting the two fluorenyl groups is 1.580 (4) A,, which is sl!ghtly longer than the C--C bond lengths [1.36-1.49 A] in other 1,3-dithiolanes.
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