@article {2906, title = {STRUCTURE OF DIMETHYL 9-METHYL-9,10-DIHYDRO-9,10-ETHENOANTHRACENE-11,12-DICARBOXYLATE}, journal = {Acta Crystallographica Section C-Crystal Structure Communications}, volume = {49}, year = {1993}, note = {ISI Document Delivery No.: LN006Times Cited: 1Cited Reference Count: 5Part 5}, month = {May}, pages = {971-973}, type = {Article}, abstract = {There are two molecules per asymmetric unit and the two ester groups have different orientations m each of them; the C=C-C=O torsion angles are 1.9 and 2.4(6)degrees for the groups remote from and 91.7 and -91.4(5)degrees for the groups adjacent to the 9-Me substituents. The remote ester groups are therefore fully conjugated with the C=C double bond [cos2(angle) = 1.0] and the adjacent groups non-conjugated [cos2(angle) = 0], presumably as a result of steric effects as in the 9-chloro derivative.}, isbn = {0108-2701}, url = {://A1993LN00600047}, author = {Pokkuluri, P. R. and Trotter, J.} }