SCHEDULED MAINTENANCE
The structure of the 1 : 2 adduct of indene and dimethyl acetylenedicarboxylate has been established by X-ray analysis of a dibromo-derivative, crystals of which are monoclinic with four molecules of C21H20Br2O8 in a cell of dimensions a= 8·48, b= 7·48, c= 34·63 Å, β= 98·0°. The space-group is P21/c. The final value of R is 0·087 for 1982 independent reflections.
K. W. Muir and G. A. Sim, J. Chem. Soc. B, 1968, 667 DOI: 10.1039/J29680000667
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