SCHEDULED MAINTENANCE:
The titanium-induced coupling of 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one (3) gave 10,10′11,11′-tetrahydro-5,5′-bis(5H-dibenzo[a,d]cycloheptenyl)(5) and the chiral bridged diphenylanthracene (4), which was resolved and has a racemization barrier of ∼23 kcal/mol (1 cal = 4.184 J); the crystal structure of (4) has been determined.
I. Agranat, M. R. Suissa, S. Cohen, R. Isaksson, J. Sandström, J. Dale and D. Grace, J. Chem. Soc., Chem. Commun., 1987, 381 DOI: 10.1039/C39870000381
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