Methyl 2-[(3,5-di-tert-butyl-4-hy-droxy-benz-yl)sulfan-yl]pyridine-3-carboxyl-ate n-hexane hemisolvate

The title solvated ester, C₂₂H₂₉NO₃S·0.5C₆H₁₄, crystallizes with two independent mol­ecules along with a hexane mol­ecule in the asymmetric unit. The two aromatic rings are separated by an –CH₂–S– linkage; the rings are aligned at 83.27 (4)° in one mol­ecule and 47.66 (7)° in the other. The hy­droxy group of one mol­ecule forms an O—H⋯O hydrogen bond to the other mol­ecule.

2-[4-Acetyl-5-(biphenyl-4-yl)-4,5-dihydro-1,3,4-oxadiazol-2-yl]phenyl acetate

In the title mol­ecule, C₂₄H₂₀N₂O₄, the five-membered oxadiazole ring is nearly planar (r.m.s. deviation = 0.053 Å) and the phenyl ring of the biphenyl unit attached to it forms a dihedral angle of 73.2 (1)°; the other phenyl ring is close to coplanar with the oxadiazole ring [dihedral angle = 6.2 (2)°].

N'-[(Biphenyl-4-yl)methyl-ene]-2-[(3,5-di-tert-butyl-4-hydroxy-benz-yl)sulfan-yl]acetohydrazide

In the title compound, C(30)H(36)N(2)O(2)S, the dihedral angle between the two aromatic rings of the biphenyl residue is 31.2 (1)°. The two methyl-ene C atoms subtend an angle of 99.9 (1)° at the S atom. In the crystal, mol-ecules form inversion dimers linked by pairs of N-H⋯O hydrogen bonds. The hydroxyl group is shielded by the tert-butyl residues and is therefore not involved in any hydrogen bonding.

Dipyridinium 2,2'-dithio-dinicotinate

The dianion of the title salt, 2C₅H₆N⁺·C₁₂H₆N₂O₄S₂²⁻, lies on a special position of 2 site symmetry that relates one thio­nicotinate part to the other, and the dihedral angle between the niotinate planes is 89.2 (2)°. The pyridinium cations are hydrogen bonded to the carboxyl­ate group by way of N—H⋯O links.

2-[(3,5-Di-tert-butyl-4-hydroxybenzyl)sulfanyl]-N′-isopropylideneacetohydrazide

The title compound, C₂₀H₃₂N₂O₂S, the condensation product of a thio­acetohydrazine and acetone, has a two-coordinate S atom and the angle at this atom is 100.7 (1)°. The (CH₃)C=N—NH—C(O)– substituent engages in N—H⋯O hydrogen-bonding inter­actions with the substituent of an adjacent mol­ecule across a center of inversion, generating a dimeric structure.

N′-(3-Bromo-5-chloro-2-hydroxybenzylidine)-2-hydroxybenzohydrazide

In the approximately planar title mol­ecule, C₁₄H₁₀BrClN₃O₂, the dihedral angle between the aromatic ring planes is 5.79 (12)°. The conformation is stabilized by intra­molecular O—H⋯N and N—H⋯O hydrogen bonds and an inter­molecular O—H⋯O link leads to chains in the crystal propagating in [001].

Biphenyl-4-carbaldehyde azine

The complete mol­ecule of the title compound, C₂₆H₂₀N₂, is generated by crystallographic inversion symmetry. The terminal phenyl ring is twisted by 19.2 (1)° with respect to the adjacent phenyl­ene ring.

Di-n-butylammonium 2-(3,5-di-tert-butyl-4-hydroxybenzylsulfanyl)nicotinate

The asymmetric unit of the title compound, C₈H₂₀N⁺·C₂₁H₂₆NO₃S⁻, contains two indpendent ion pairs which are disposed about a psuedo-inversion center, generating an ammonium–carboxylate N—H⋯O hydrogen-bonded four-component cluster. In the crystal structure, adjacent clusters are linked by hydr­oxy–carboxylate O—H⋯O hydrogen bonds, forming a chain.

N-Acetyl-2-hydroxy-N'-[methoxy(1-methylindol-2-yl)methyl]benzohydrazide

In the crystal structure of the title Schiff-base, C(20)H(21)N(3)O(4), the amino group forms an N-H⋯O hydrogen bond to the acetyl group of an adjacent mol-ecule, forming a zigzag chain. The 2-hydr-oxy group is inter-nally hydrogen bonded to the amido group though an O-H⋯O hydrogen bond.

2-(3,5-Di-tert-butyl-4-hydroxy-benzyl-sulfan-yl)nicotinic acid

Two mol­ecules of the title compound, C₂₁H₂₇NO₃S, are disposed about a center of inversion, generating an O—H⋯O hydrogen-bonded dimer.

N'-(3,5-Di-tert-butyl-4-hydroxy-benzyl-idene)-2-hydroxy-benzohydrazide methanol solvate

The asymmetric unit of the title compound, C(22)H(28)N(2)O(3)·CH(4)O, consists of two independent Schiff base mol-ecules and two independent methanol solvent mol-ecules. In one Schiff base mol-ecule, the 2-hydr-oxy group forms an intra-molecular hydrogen bond with the amide O atom, whereas in the other Schiff base mol-ecule, the 2-hydr-oxy-substituted benzene ring is oriented so that the 2-hydr-oxy group serves as hydrogen-bond acceptor for the amide NH group. In the crystal structure, Schiff base mol-ecules inter-act with methanol solvent to furnish a hydrogen-bonded chain.

(2,4-Dimethoxy-benzyl-idene)-2-hydroxy-benzohydrazide ethanol solvate

In the planar title mol­ecule, C₁₆H₁₆N₂O₄·C₂H₆O, the planar Schiff base molecule is linked to the ethanol solvent mol­ecule by a hydr­oxy–amide hydrogen bond. The hydr­oxy group of the ethanol mol­ecule is a hydrogen-bond donor to the double-bonded N atom of an adjacent Sciff base, pairs of interactions taking place across a center of symmetry and giving rise to a hydrogen-bonded dimer.

2-Hydr-oxy-(2-methyl-1H-indol-3-ylmethyl-idene)benzohydrazide ethanol solvate

In the title compound, C₁₇H₁₅N₃O₂·C₂H₆O, Schiff base molecules are linked by a hydr­oxy–amido hydrogen bond into a helical chain running along the b axis. This chain is consolidated by two other hydrogen bonds; the ethanol solvent mol­ecule is a hydrogen-bond donor to the amide group and a hydrogen-bond acceptor for the indolyl NH group of an adjacent Schiff base mol­ecule.