Bis[2,3,4-trimethyl-5-[(3,4,5-trimethyl-2H-pyrrol-2-yl­idene-κN)meth­yl]-1H-pyrrolato-κN]copper(II)

In the title complex, [Cu(C₁₅H₁₉N₂)₂] or [Cu(L₂)] (HL is 3,3′,4,4′,5,5′-hexa­methyl­pyrromethene), the Cu^II atom is coordinated by four N atoms [Cu—N 1.939 (2)–1.976 (2) Å] from two L ligands in a distorted tetra­hedral geometry. The mean planes of the CuN₂C₃ metallocyclic rings form a dihedral angle of 72.73 (6)°. In the L ligands, the pyrrole rings are inclined to each other at dihedral angles of 3.03 (7) and 9.83 (7)°. The crystal packing exhibits weak inter­molecular C—H...π inter­actions, which form chains in [100].

Di-μ-carbonyl-bis­[bis­(triphenyl­phos­phane)rhodium(0)](Rh—Rh) acetone disolvate

The dirhodium complex, [Rh₂(C₁₈H₁₅P)₄(CO)₂]·2(CH₃)₂CO, has crystallographic twofold symmetry and the Rh—Rh distance is 2.6266 (8) Å. The four atoms proximate to each Rh atom [Rh—P = 2.3222 (7) and 2.3283 (8) Å, and Rh—C = 1.961 (3) and 2.045 (3) Å] form a distorted tetra­hedron with large deviations from the putative tetra­hedral angles [r.m.s. deviation = 23 (1)°]. The six angles more closely approximate those of a trigonal bipyramid [r.m.s. deviation = 14 (1)°] with one missing equatorial ligand. The two bridging carbonyl ligands are much more linearly coordinated to one Rh [Rh—C[triple bond]O = 151.0 (2)°] than to the other [127.0 (2)°], and the two Rh₂CO planes form a dihedral angle of 45.43 (5)°. The two acetone solvent mol­ecules are disordered, and their estimated scattering contribution was subtracted from the observed diffraction data using the SQUEEZE routine in PLATON [Spek (2009). Acta Cryst. D65, 148–155].

1-(2-Hy­droxy-5-meth­oxy­phen­yl)-3-methyl­but-2-en-1-one

The title compound, C₁₂H₁₄O₃, is a natural product derived from the medium-sized hawthorn Crataegus persimilis ('prunifolia'). The mean plane of the butene moiety is twisted by 13.27 (7)° with respect to the that of the dioxobenzaldehyde moiety. There is an intra­molecular hydrogen bond between the hydroxyl group and the carbonyl O atom.

(1E,2E)-1,2-Bis[(1-benzyloxymethyl-1H-indol-3-yl)methylidene]hydrazine

The title compound, C₃₄H₃₀N₄O₂, lies on an inversion center and consists of two 3-substituted-1H-indole units linked by a 1,2-dimethyl­enehydrazine bridge. It is one of numerous examples in which two aromatic ring systems are joined by this 4-atom bridge. The geometry of the centrosymmetric bridge is: C(arom)—C = 1.444 (3), C=N = 1.284 (3), N—N = 1.414 (4) Å, C(arom)—C=N = 122.6 (2) and C=N—N = 111.9 (2)°. The nine non-H atoms of the indole unit lie in a plane (δ_r.m.s. = 0.0089 Å) which is twisted 6.0 (2)° with respect to the hydrazine bridge plane. The benzyl­oxymethyl substituents do not lie in the plane of the rest of the mol­ecule and are in a folded rather than an extended conformation. This is described by the three torsion angles in the middle of the C=N—C—O—C_Bz group, viz. 98.5 (3), −62.1 (3), and −66.3 (2)°.

Redetermination and absolute configuration of (+)-7-epiclusianone

The absolute configuration of 3-benzoyl-4-hy­droxy-6,6-dimethyl-1,5,7-tris­(3-methyl­but-2-en­yl)bicyclo­[3.3.1]non-3-ene-2,9-dione, C₃₃H₄₂O₄, isolated from Hypericum hypericoides, has been determined. The previous study [Xiao et al. (2007). J. Nat. Prod. 70, 1779–1782] gave only the established relative configuration. The three stereogenic centers are now established as 1R, 5R and 7S on the basis of the refinement of the Flack absolute structure parameter against Cu Kα data and correspond to a specific rotation of [α]_D²⁰ = +66°. The enol–hy­droxy group forms an intra­molecular O—H...O hydrogen bond to close an S(6) ring.

5,7,8,10,11,13,14,16-Octa­hydro-6,15-(ethanoxyethanoxyethano)-1,4:17,20-dietheno[9,12,6,15]benzodioxadiaza­cyclo­docosine

The title compound, C₃₂H₄₀N₂O₄, is a 1,10-diaza-18-crown-6 cryptand with an o-terphenyl bridge. In the polyether ring, two adjacent –CH₂– groups are disordered with very nearly equal populations of two conformers. The ordered bond lengths are normal, with average C—C = 1.511 (3) Å, C—O = 1.421 (3) Å, and C—N = 1.466 (4) Å. The r.m.s. deviations of the three rings of the terphenyl bridge vary from 0.007 to 0.009 Å and the two rings ortho to one another are twisted by 50.75 (5) and 47.76 (4)° with respect to the third ring. The N...N distance is 5.408 (1) Å.