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Addition of THF to a solution of dimeric 1,2-bis(chloromethylalumino) tetrafluorobenzene (1) induces a ring contraction process that results in the formation of a mixture of three dialacycles as shown by 1 H- and 19 F-NMR. The three diaalacycles have been identified as 9-methyl-10-chloro-9,10-dihydro-9,10-diala-octafluoroanthracene bis(THF) adduct (2a), 9,10-dichloro-9,10-dihydro-9,10-diala-octafluoroanthracene...
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