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organic compounds
In the title compound, C19H30Si, the double bonds are essentially localized. The central ring and its substituents, including the triple-bond system, are coplanar, with the Si atom lying 0.148 (2) Å out of the plane. The packing involves herring-bone layers parallel to the ab plane.
organic compounds
In the title compound, C30H18, the fluorene moiety displays normal dimensions, such as a narrow ring angle of 105.3 (3)° at the 9-position, the atom bearing the exocyclic double bond. The phenyl rings subtend angles of 14.8 (2) and 3.9 (2)° to the fluorene plane. Molecules are stacked parallel to the short c axis of 4.001 (1) Å.
organic compounds
In the title compound, 2C30H18·3C12H4N4, the asymmetric unit consists of half a formula unit (one quinodimethane molecule displays inversion symmetry). There is no ring stacking; instead, the residues associate by weak C—H
N contacts in planes parallel to (2
).
N contacts in planes parallel to (2
).organic compounds
In the title compound, C22H34Si2, the two independent molecules are closely similar. The reduced rings show a flattened twist conformation. Several features of [2.2]paracyclophane strain (e.g. lengthened bridge bonds) are apparent; an exception is furnished by the normal sp2 values of the angles at the bridgehead atoms of the reduced rings.
organic compounds
The title compound, C28H52Si4, crystallizes in the uncommon space group I4122 with 222 symmetry. Despite the reduction of the rings, several features of [2.2]paracyclophane strain are still apparent.
organic compounds
The title compound, C8H8Br4, displays crystallographic inversion symmetry. The packing involves interpenetrating corrugated layers built up via BrBr and Brπ contacts.
Br and Brπ contacts.organic compounds
The title compound, C11H20O, shows a wide Me3C—C=C angle of 129.60 (14)°. Molecules associate into zigzag chains parallel to [101] via a hydrogen bond HmethylOketone.
Oketone.
