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1.  The ansa-zirconocene [bis­(η5-cyclo­penta­dien­yl)phenyl­phosphine]­dichloridozirconium(IV) 
In the title compound, [Zr(C16H13P)Cl2], the geometry at the metal atom is distorted tetra­hedral; the Cl—Zr—Cl angle is 101.490 (16)° and the cyclo­penta­dienyl (Cp) centroids subtend an angle of 122.63 (3)° at the Zr atom. The P atom lies 0.474 (3) and 0.496 (3) Å out of the planes of the Cp rings. The C—P—C angle of 91.42 (7)° reflects the pincer effect of the two Cp rings. Three C—H⋯Cl, one C—H⋯P, one C—H⋯π and one Cl⋯P inter­action link the mol­ecules to form thick layers parallel to the bc plane.
doi:10.1107/S0108270110004531
PMCID: PMC2855579  PMID: 20203402
2.  rac-(2R,3S)-2-Phenyl-3-(3-phenyl-1,2,3,4-tetra­hydro­quinoxalin-2-yl)quinoxaline 
The title compound, C28H22N4, is the unexpected by-product of the reaction of 2-hydroxy­acetophenone and 1,2-diamino­benzene under iodine catalysis, during which a carbon–carbon σ-bond between two quinoxaline units was formed. Although a fully oxidized title compound should sterically be possible, only one quinoxaline ring is fully oxidized while the second ring remains in the reduced form. As expected, the tetra­hydro­quinoxaline unit is not planar; it adopts a sofa conformation, whereby the atom joining the two heterocyclic systems lies out of the plane of the other atoms. The quinoxaline ring system makes a dihedral angle of 53.61 (4)° with its phenyl ring substituent. The crystal packing is determined by pairs of N—H⋯N, N—H⋯π and weak C—H⋯N hydrogen bonds, forming a chain parallel to the a axis.
doi:10.1107/S1600536808015481
PMCID: PMC2961777  PMID: 21202845

Results 1-2 (2)