R. Rogers, R. Henry, A. Rollins
Jul 1, 1992
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0
Influential Citations
3
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Journal
Journal of inclusion phenomena and molecular recognition in chemistry
Abstract
The crystal structures of three nitrated benzocrown ethers have been determined. Nitrobenzo-15-crown-5 crystallizes in the orthorhombic space group,Pca21, witha = 15.367(2),b = 4.8499(8),c = 19.963(5)Å, andDcalc = 1.40 g cm−3 forZ = 4. Dinitrobenzo-15-crown-5 crystallizes in the monoclinic space group,P21/n, witha = 11.716(2),b = 8.495(3),c = 17.441(5)Å,β = 108.40(2)° andDcalc = 1.44 g cm−3 forZ = 4.Dinitrodibenzo-18-crown-6·2CH3CN ismonoclinic,P21/n,witha = 8.138(2),b = 20.435(9),c = 15.953(9)Å,β = 100.55(4)° andDcalc = 1.36 g cm−3 forZ = 4. The nitro substituents are in the plane of the benzo ring except in the sterically congested dinitrobenzo-15crown-5. The observed crown ether conformations are similar to their substituted analogs.