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In the title mol­ecule, C20H32NPSe, the P atom has a distorted tetra­hedral environment resulting in an effective cone angle of 172°. Weak inter­molecular C—H⋯Se inter­actions are observed.

In the title compund, C21H33PSe, the Se=P bond is part of a distorted tetra­hedral environment on the P atom. Both cyclo­hexyl groups adopt chair conformations. A cone angle of 170° was calculated using an adaptation of the Tolman model. Inter­molecular C—H⋯Se and C—H⋯Cg contacts are observed (Cg is the centroid of the benzene ring).

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Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.006 Å; R factor = 0.041; wR factor = 0.096; data-to-parameter ratio = 13.8.In the title compound, C 30 H 33 BrO 6 , the pyranose ring adopts a chair conformation. Two of the O-benzyl phenyl rings lie almost perpendicular to C/C/C/O plane formed by the ring atoms not attached to these O-benzyl phenyl rings, and form dihedral angles of 85.1 (2) and 64. 6 (2) , while the third Obenzyl phenyl ring is twisted so that it makes a dihedral angle 34.9 (2) to this C/C/C/O plane. This twist is ascribed to the formation of an S(8) loop stabilized by a weak intramolecular C-HÁ Á ÁO hydrogen bond. Related literature