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Thermally induced solid-state Z–E isomerisation in bi(cyclopentenylidene) compounds. X-Ray crystal structure of (Z)$-2,2^\prime-dioxo 3,3^\prime,4,4^\prime,5\alpha,5^\prime \beta-$hexa-phenyl-1,$1^\prime -$bi(cyclopentenylidene)

Vyas, K and Hattikudur, M (1990) Thermally induced solid-state Z–E isomerisation in bi(cyclopentenylidene) compounds. X-Ray crystal structure of (Z)$-2,2^\prime-dioxo 3,3^\prime,4,4^\prime,5\alpha,5^\prime \beta-$hexa-phenyl-1,$1^\prime -$bi(cyclopentenylidene). In: Journal of the Chemical Society, Perkin Transactions 2 (7). pp. 1177-1180.

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The crystal and molecular structure of the title compound has been determined; it crystallises as a methanol solvate in the space group $P2_1$/n with a= 11.647(2), b= 18.583(2), c= 16.113(2)$\AA,\beta= 92.11(1)^o$ and Z= 4. The structure has been solved by direct methods and refined to a final R value of 0.090. The molecular structure is different from that proposed earlier on the basis of spectral data. The central bond connecting the two five-membered rings displays pure double-bond character due to lack of conjugation. This is responsible for the thermal stability of the compound and the relatively high temperature for the isomerisation. One of the two five-membered rings assumes an envelope conformation and the other a half-chair. The solvent methanol molecule is disordered.