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The crystal structures of three products of the reaction of 2-phenyl­phenol and BCl3 have been determined. The structures show intriguing packing patterns and an inter­esting case of pseudosymmetry. In addition, one of the two polymorphs has a primitive monoclinic crystal system, but it is twinned and emulates an ortho­rhom­bic C-centred structure.

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Crystals of hexa-tert-butyl­disilane undergo a reversible phase transition at 179 (2) K. The space group changes from Ibca (high temperature) to Pbca (low temperature), but the lattice constants a, b and c do not change significantly during the phase transition. In a new polymorph of 1,1,2,2-tetra-tert-butyl-1,2-di­phenyl­disilane, two independent mol­ecules have rather similar conformations.

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In two polymorphs of the tetra­hydro­furan disolvate of 2,5-[(di­phenyl­phosphan­yl)meth­yl]-1,1,2,4,4,5-hexa­phenyl-1,4-diphospha-2,5-dibora­cyclo­hexane and a pseudo-polymorph of the toluene solvate, the crystal packings are significantly different, but, surprisingly, their mol­ecular conformations are the same.
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