Volume 71 Part 10 October 2015 Pages 1132

Volume 71 | Part 10 | October 2015 | Pages 1132– 1135 | 10. 1107/S 2056989015015352 Comparison of the crystal structures of 4, 4′ bis [3 (4 methyl piperidin 1 yl)prop 1 yn 1 yl] 1, 1′ biphenyl and 4, 4′ bis [3 (2, 2, 6, 6 tetra methyl piperidin 1 yl)prop 1 yn 1 yl] 1, 1′ biphen yl A. Wan, N. R. Penthala, E. K. Fifer, S. Parkin and P. A. Crooks

Comparison of the crystal structures of 4, 4′ bis [3 (4 methyl piperidin 1 yl)prop 1 yn 1 yl] 1, 1′ biphenyl and 4, 4′ bis [3 (2, 2, 6, 6 tetra methyl piperidin 1 yl)prop 1 yn 1 yl] 1, 1′ biphen yl The crystal structures of the two title compounds display chair conformations of the piperidine rings in their mol ecules. In compound (I), the biphenyl system has a twisted conformation with a dihedral angle of 26. 57 (6)° while in compound (II) the two phenyl rings are exactly coplanar. Keywords: bis tertiary ammonium analog; biphenyl ring; piperidine ring; crystal structure Wan et al. Volume 71 | Part 10 | October 2015 | Pages 1132– 1135 | 10. 1107/S 2056989015015352

Figure 1. The mol ecular structure of (I), with displacement ellipsoids drawn at the 50% probability level. Wan et al. Volume 71 | Part 10 | October 2015 | Pages 1132– 1135 | 10. 1107/S 2056989015015352

Figure 2. The mol ecular structure of (II), with displacement ellipsoids drawn at the 50% probability level. Unlabelled atoms are generated by the symmetry operator (1 − x, 2 − y, . . . Wan et al. Volume 71 | Part 10 | October 2015 | Pages 1132– 1135 | 10. 1107/S 2056989015015352