摘要:
The title calix[4]arene, cis-ll,17-di-tert-butyl-2,5,23-trimethyl-14-(4-nitrophenyl)pentacyclo[19.3.1.1(3,7).1(9,13).1(15,19)]octacosa-1(25),3,5,7(26),9,11,13(27),15,17,19(28),21,23-dodecaene-25,26,27,28-tetraol-chloroform (1/0.5), C45H49NO6.0.5CHCl(3), substituted at two opposite methylene bridges by methyl and p-nitrophenyl groups, forms centrosymmetric hydrogen-bonded dimers in the solid state. This results in an eight-membered (O-H ...)(8) ring, with O ... O distances in the range 2.637 (4)-2.828 (4) Angstrom. Pairs of calix[4]arene molecules (related by another inversion centre) each have a p-methyl group of one molecule fitting snugly into the cavity of the other, with shortest intermolecular C ... C contacts corresponding to normal C ...pi-arene interactions. The half-occupancy chloroform molecule lies disordered about another independent inversion centre filling what would otherwise have been a void in the crystal lattice.