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In the title compound, C9H14BNO4, the carbonyl and boronic acid groups are essentially coplanar with the pyrrole ring and the boronic acid group has an exo-endo conformation. The exo-oriented OH is engaged in an intra­molecular O—H⋯O inter­action, while the endo-oriented one is involved in inter­molecular hydrogen bonding to form centrosymmetric dimers. A supra­molecular assembly is achieved through inter­actions involving the tert-butyl groups, forming infinite chains along the crystallographic b axis. There are, in addition, face-to-face and center-to-edge stacking inter­actions [distance between the pyrrole ring centroid and an N atom from a neighbouring mol­ecule = 3.369 (8) Å].

In the title mol­ecule, C16H25NO4, the non-H atoms, except for the two tert-butyl groups, are roughly planar (r.m.s. deviation of the non-H atoms = 0.086 Å). In the crystal, mol­ecules are linked into inversion dimers by pairs of N—H⋯O hydrogen bonds, forming R 2 2(10) ring motifs.

In the title compound, C16H18N2O2, the mol­ecule adopts an E conformation about the C=N double bond. The dihedral angle between the pyrrole and phenyl rings is 41.55 (8)°. In the crystal structure, pairs of inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers. In the dimer, the two pyrrole rings are almost coplanar and the two phenyl rings are parallel to each other.

The title compound, C10H14N2O4S, was synthesized by the reaction of methyl 2-amino­thia­zole-5-carboxyl­ate and di-tert-butyl carbonate. In this structure, the thia­zole ring is planar (mean deviation = 0.0011 Å). Two weak intra­molecular C—H⋯O hydrogen bonds are formed between two of the methyl groups and one carbonyl O atom, resulting in the formation of two twisted six-membered rings. Inter­molecular N—H⋯N hydrogen bonds link the mol­ecules to form centrosymmetric dimeric units, and the hydrogen-bond scheme is completed by inter­molecular C—H⋯O contacts.

The mol­ecule of the title compound [systematic name: 2-(4-tert-butyl­benz­yl)isoindoline-1,3-dione], C19H19NO2, is V-shaped with a dihedral angle of 74.15 (7)° between the mean planes of the phthalimide unit and the benzene ring. The methyl groups of the tert-butyl substituent are disordered over two sets of positions, with an occupancy ratio of 0.700 (4):0.300 (4). In the crystal, inter­molecular C—H⋯O hydrogen bonds link adjacent mol­ecules into centrosymmetric dimers. An additional weak C—H⋯O contact, together with weak C—H⋯π and π–π inter­actions [centroid–centroid distance = 3.961 (2) Å] generate a three-dimensional network.

In the title compound, C14H16N2O4S, the eth­oxy­carbonyl group is nearly planar, with an r.m.s. deviation of 0.0067 Å, and is almost coplanar with the pyrrole ring [dihedral angle = 5.81 (15)°], whereas it is inclined at a dihedral angle of 61.90 (13)° to the phenyl ring. The dihedral angle between the pyrrole and phenyl rings is 56.15 (13)°. In the crystal, centrosymmetrically related mol­ecules are linked into dimers by pairs of N—H⋯O hydrogen bonds, forming rings of R 2 2(10) graph-set motif. The dimers are further connected by weak inter­molecular C—H⋯O hydrogen bonds and C—H⋯π inter­actions, forming layers parallel to the bc plane.

The title compound, C18H30N4O2, contains two tert-butyl urea groups, each connected to a benzene ring though a methyl­ene group. One of the groups occupies a position almost normal to the aromatic plane with a C—N—C—C torsion angle of −94.4 (4)°, while the other is considerably twisted from the ring with a C—N—C—C torsion angle of −136.1 (4)°. In the crystal, pairs of mol­ecules are connected to each other, forming centrosymmetric dimers in which two NH groups of one mol­ecule act as hydrogen-bond donors to one carbonyl O atom of the other mol­ecule. The dimers are linked into sheets parallel to (100) by N—H⋯O hydrogen bonds involving the remaining N—H and C=O groups.

The title compound, C26H28O3Si, is an allylic oxidation product of the tert-but­yl(2,2-dimethyl-2,3-dihydro­benzo­furan-7-yl­oxy)diphenyl­silane with N-bromo­succinimide and 2,2′-azobis-isobutyronitrile. The nine-atom bicyclic system is almost planar, with an r.m.s deviation of 0.0123 (2) Å and a maximum deviation of 0.031 (2) Å for the O atom. In the crystal, the mol­ecules pile up along the b axis but the strongest inter­molecular contacts are the π–π stacking inter­actions between the benzene rings along the c axis [centroid–centroid distance = 3.655 (3) Å].

In the centrosymmetric binuclear title compound, [Cu2(C8H3ClO4)2(C12H12N2)2(H2O)4], the CuII ion is six-coordinated by two N atoms from a 5,5′-dimethyl-2,2′-bipyridine ligand, two bridging O atoms from two 3-chloro­benzene-1,2-dicarboxyl­ate ligands and two water mol­ecules in a distorted octa­hedral geometry. The binuclear complex mol­ecules are linked together by inter­molecular O—H⋯O hydrogen bonds into a layer parallel to (100). The layers are connected by C—H⋯Cl hydrogen bonds. Intra­molecular O—H⋯O hydrogen bonds and π–π inter­actions [centroid–centroid distance = 3.5958 (16) Å] are also present.

In the title compound [systematic name: (tert-butyl­dimethyl­silyl)methane­triyl tris­(4-methyl­benzene­sulfonate)], C32H44O10S3Si, the central C atom and the SiIV center are in a tetra­hedral configuration. The inter­planar angles between pairs of the three benzene rings of the 4-methyl­phenyl­sulfonyl units are 41.15 (10), 18.11 (10) and 44.09 (10)°. C—H⋯π inter­actions are observed in the crystal structure. Mol­ecules are linked into screw chains along the b axis by weak C—H⋯O inter­actions. Weak intramolecular C—H⋯O hydrogen bonds are also present.

In the title compound, C10H12N6·C2H5OH, the planarity of the heterocyclic system is slightly distorted at the triazine ring (r.m.s. deviation = 0.1191 Å), which adopts a conformation best described as inter­mediate between a flattened twisted boat and a half-boat with the tertiary Csp 3 atom at the bow. In the crystal, mol­ecules form centrosymmetric dimers connected by N⋯H—O and O⋯H—N hydrogen bonds between the amino group H atom, the ethanol solvent mol­ecule and the triazine N atom, making an R 4 4(12) graph-set motif. The other H atom of the amino group and the H atom on the endocyclic N atom form N⋯H—N hydrogen bonds with the N atoms of the pyrazole and pyridine rings, respectively, linking the mol­ecules into C(7)C(7) chains with the R 2 2(8) binary graph-set motif running along [010].

In the title mol­ecule, C17H14O4, the C atom of the carboxyl group deviates by 1.221 (3) Å from the plane [maximum deviation = 0.0122(2) Å] of the tricycic ring system. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into centrosymmetric dimers, and π–π inter­actions [centroid–centroid distances = 3.491 (3), 3.591 (3), 3.639 (3) and 3.735 (3) Å] link these dimers into layers parallel to the ac plane. Weak inter­molecular C—H⋯O inter­actions further consolidate the crystal packing.

The title mol­ecule, C13H11NO, is almost flat, the angle between the pyrrole and the phenyl rings being 10.9 (1)°. The atoms of the central C3O unit are coplanar, with a mean deviation from the plane of 0.001 (1) Å. The angles between this plane and the pyrrole and phenyl rings are 3.3 (1) and 8.0 (1)°, respectively. The mol­ecules form centrosymmetric dimers through a pair of N—H⋯O hydrogen bonds with an R 2 2(10) motif.

The asymmetric unit of the title compound, C6H9ClN4, contains four independent mol­ecules (A, B, C and D). Their main difference is the torsion angles, ranging from 1.6 (5) to 5.9 (5)°, between the methyl group and the pyrimidine plane. A pair of inter­molecular N—H⋯N hydrogen bonds link mol­ecules A and C into a twisted dimer with a dihedral angle of 32.9 (1)° between the two pyrimidine rings, creating an R 2 2(8) motif. In the packing, each two mol­ecules of B, C and D form centrosymmetric dimers through two inter­molecular N—H⋯N hydrogen bonds, locally creating R 2 2(8) motifs. The dimers of C and D are alternately bridged by A into an infinite zigzag strip, locally creating two different R 2 2(8) motifs with dihedral angles of 32.9 (1) and 63.4 (1)° between the pyrimidine rings. Finally, these strips together with the dimers of B associate into a complicated three-dimensional framework.

In the crystal structure of the title compound, C25H30N2O4, the steric size of the tert-butyl group causes the 3,5-dimethyl­phenyl ring to adopt a transoid geometry with respect to the N—C(O) bond. The six-membered heterocyclic ring is disordered over two sites, with occupancies of 0.553 (4) and 0.447 (4). Intra­molecular C—H⋯O inter­actions are present. In the crystal, mol­ecules are linked by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds.

In the title compound, [Mo(C15H22BN6)Cl(NO)(C9H13N)]·CH2Cl2, the MoI atom adopts a distorted MoClN5 octa­hedral geometry with the hydro­tris­(3,5-dimethyl­pyrazol­yl)borate anion in an N,N′,N′′-tridentate tripodal (facial) coordination mode. A 4-tert-butyl­pyrine ligand, chloride anion and a nitrosyl cation complement the coodination of the MoI atom and an intra­molecular C—H⋯Cl hydrogen bond helps to stabilize the configuration of the complex mol­ecule. The packing is stabilized by an inter­molecular C—H⋯Cl hydrogen bond involving the complex mol­ecule and the CH2Cl2 solvent mol­ecule.

The title compound, C12H16O2, is approximately planar (r.m.s. deviation = 0.030 Å), apart from two methyl groups of the tert-butyl unit [deviations of the C atoms = 1.140 (2) and −1.367 (1) Å]. In the crystal, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into hexa­meric rings with R 6 6(48) graph-set motifs.

The tripeptide title compound, C32H53N3O6, synthesized in 80% yield by coupling of N-methyl-l-leucine benzyl ester with tert-butoxy­carbonyl-l-leucyl-N-methyl-l-leucine at 273 K, conjugates through two amide linkages and includes two protecting groups: a tert-butyl­oxycarbonyl group at the C-tip and a benzyl group at the N-tip. A classical inter­molecular N—H⋯O hydrogen bond and a weak non-conventional inter­molecular C—H⋯O contact connect the mol­ecules, forming layers parallel to (001).

In the title compound, C18H13BrN4S·C3H7NO, the thio­pyran ring and the adjacent six-numbered ring adopt distorted boat conformations. The mol­ecules, lying about inversion centers, form hydrogen-bonded dimers involving one of the H atoms on the amino group with the N atom of a cyano group of an adjacent mol­ecule, resulting in a 12-membered ring system [R 2 2(12) ring motif]. The other H atom of the amino group forms an inter­molecular hydrogen bond with the O atom of the dimethyl­formamide (DMF) mol­ecule. Another lone pair of electrons on the same carbonyl O atom of DMF mol­ecule forms a non-classical C—H⋯O inter­molecular hydrogen bond, resulting in a chain of mol­ecules.

In the title compound, C11H15NOS, the 3-(dimethyl­amino)­prop-2-en-1-one unit is approximately planar [maximum deviation = 0.0975 (14) Å] and its mean plane of seven non-H atoms makes a dihedral angle of 6.96 (10)° with the thio­phene ring. In the crystal, mol­ecules are linked by pairs of C—H⋯O hydrogen bonds into inversion dimers with R 2 2(14) ring motifs. The dimers are stacked along the c axis through C—H⋯π inter­actions. The two methyl groups, attached to the thio­phene ring and the amino N atom, are each disordered over two orientations, with site-occupancy ratios of 0.59 (4):0.41 (4) and 0.74 (4):0.26 (4), respectively.

In the mol­ecule of the title compound, C9H9N3O2, the indazole ring system is almost planar [maximum deviation = 0.019 (3) Å for the C atom bearing the nitro group]. In the crystal structure, inter­molecular C—H⋯O inter­actions link the mol­ecules into centrosymmetric dimers, forming R 2 2(18) ring motifs. Aromatic π–π contacts between indazole rings [centroid–centroid distances = 3.632 (1) and 3.705 (1) Å] may further stabilize the structure.

The title compound, C23H32Cl2N2O2, a potential chiral ligand for coordination chemistry, was prepared by a two-step reaction. The mol­ecule is located on a crystallographic centre of inversion. As a result, the methyl group bonded to the methyl­ene group is disordered over two equally occupied positions, sharing the same site as the H atom of the chiral C atom. As a further consequence of the crystallographic centrosymmetry, the 1,2-diamino­propane unit adopts an anti­periplanar conformation and the two benzene rings are coplanar. The central chain is in an all-trans arrangement. An intra­molecular O—H⋯N hydrogen bond makes an S(6) ring motif. A C—H⋯π inter­action links the mol­ecules into one-dimensional chains along the [001] direction.

The title compound, C13H18N2O4, crystallizes as discrete mol­ecules associated as N—H⋯O hydrogen-bonded dimers disposed about a crystallographic inversion centre. The structure is the first solid-state structure for a 3-acetyl­pyridone without C-4 to C-6 substituents. The amide subsituent at C-3 is coplanar with the pyridone ring, while the tert-butyl ester group is orthogonal to the pyridine ring. The amide and ester carbonyl O atoms are not involved in strong hydrogen bonding with only a number of intramolecular and intermolecular C—H⋯O inter­actions apparent in the structure.

In the title compound, C13H16N10O2S·C5H9NO·H2O, the entire 1-methylpyrrolidin-2-one (NMP) mol­ecule is disordered over two sites with occupancies of 0.488 (5) and 0.512 (5). The six-membered triazine ring and the two five-membered pyrazole and thiadia­zole rings, together with the diazene (–N=N–) linkage are almost coplanar (r.m.s. deviation for the non-H atoms = 0.0256 Å) with methyl groups from the tert-butyl substituent on the pyrazole ring located above and below the plane. Three intra­molecular N—H⋯N hydrogen bonds contribute to the planarity of the system. The O atom of the NMP mol­ecule is hydrogen bonded to an O—H group of water. In turn, the water mol­ecule is hydrogen bonded to the mono-azo skeleton through inter­molecular N—H⋯O and O—H⋯N hydrogen bonds. At both ends of the long mol­ecular axis of the main mol­ecule there are inter­molecular N—H⋯N hydrogen bonds, arranged in a head-to-tail fashion, between the N—H group of the triazine ring of one mol­ecule and the N atom of the thia­diazole ring of a neighboring mol­ecule. These form a polymeric chain along [110] or [10]. The main mol­ecules are stacked alternately along the b axis, which effectively cancels their dipole moments. In addition, pairs of alternate molecules are dimerized via inter­molecular hydrogen bonds involving the solvent mol­ecules.

In the title compound, 2C6H9N2 +·C5H2N2O4 2−·3H2O, the 1H-pyrazole-3,5-dicarboxyl­ate anion is close to planar [maximum deviation = 0.208 (1) Å]. The two distinct 2-amino-5-methyl­pyridinium cations are also almost planar, with maximum deviations of 0.018 (2) and 0.014 (2) Å. In the crystal, pairs of inter­molecular N—H⋯O and O—H⋯O hydrogen bonds connect neighbouring mol­ecules into dimers, generating R 2 2(8) and R 2 4(8) ring motifs, respectively. Further inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.