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There are two independent mol-ecules in the asymmetric unit of the title compound, C(24)H(22)N(2)O(3). The heterocyclic ring assumes a twisted boat conformation and N-H⋯O inter-actions help to construct the three-dimensional network within the crystal packing.

The dimethoxypbenzene ring in the title compound, C(19)H(21)NO(5), is gauche to the amide group and anti to the ester group. The chirality was confirmed to be S from two-dimensional NMR spectroscopy. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds and several short-contact inter-actions (2.07-3.45 Å) create chains parallel to [110]. The phenyl ring is disordered over two orientations in a 0.54 (2):0.46 (2) ratio.

The title compound, C(38)H(36)N(2)O(2)S, has a heterocyclic ring that assumes a half-chair conformation. The phenyl rings of neighbouring mol-ecules align forming alternating chains parallel to [100] within the crystal packing. The absolute stereochemistry of the crystal was confirmed to be R,S at the 1- and 3-positions, respectively, by proton NMR spectroscopy. A single intra-molecular N-H⋯N hydrogen bond is observed.

Mol-ecules of the title compound, C(31)H(30)NO(5)P, show a sttagered conformation about the C-C bond joining the dimeth-oxy-benzene group to the chiral centre, with the dimeth-oxy-benzene ring gauche to the amide group and anti to the ester group. In the crystal, weak inter-molecular N-H⋯O and C-H⋯O hydrogen bonds form layers parallel to (110).

In the title compound, C(26)H(27)NO(4), the heterocyclic ring assumes a half-chair conformation and inter-molecular C-H⋯O inter-actions help to construct the three-dimensional network within the crystal packing.

In the title compound, C(20)H(21)NO(6), an N-oxide-based organocatalyst, the N-containing six-membered ring adopts a twisted half-chair conformation. No hydrogen bonding or π-π stacking was found within the crystal structure.

In the title compound, C(19)H(21)NO(4), an organocatalyst with a tetra-hydro-isoquinoline backbone, the heterocyclic ring assumes a half-boat conformation. The dihedral angle between the aromatic rings is 82.93 (8)°. In the crystal, mol-ecules are linked via N-H⋯O and C-H⋯O hydrogen bonds, forming a layer parallel to (10[Formula: see text]).

The asymmetric unit of the title compound, C(29)H(34)N(2)O, contains two mol-ecules in which the N-containing six-membered rings assume different conformations viz. half-chair and envelope. Inter-molecular N-H⋯O hydrogen bonding via the amide groups cross-link the mol-ecules in the crystal structure.

There are two independent mol-ecules in the asymmetric unit of the title compound, C(19)H(25)NO(4). A single C-H⋯π inter-action and various inter-molecular contacts (2.65-2.83 Å) link the independent mol-ecules in the crystal structure. The N-containing six-membered ring assumes a twisted half-boat conformation.

The title compound, C(19)H(18)O(4), exhibits a long C-C bond [1.575 (2) Å] in the cage structure. In the crystal, pairs of O-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers. C-H⋯O inter-actions also occur.

In the title compound, C(17)H(18)NO(2) (+)·Cl(-)·H(2)O, a precursor to novel asymmetric catalysts, the N-containing six-membered ring of the tetra-hydro-quinolinium unit assumes a half-boat conformation. In the crystal, inter-molecular O-H⋯O, O-H⋯Cl, N-H⋯Cl and C-H⋯O hydrogen bonds and C-H⋯π inter-actions link the mol-ecules into a three-dimensional network.

The structure of the title compound, C(18)H(20)N(2)O, at 173 K has hexa-gonal (P6(1)) symmetry. The N-containing six-membered ring assumes a half-chair conformation. In the crystal, inter-molecular N-H⋯O hydrogen bonding via the amide groups cross-link the mol-ecules along the a axis. The absolute configuration was confirmed by 2D NMR studies.

The title compound, C(20)H(23)NO(5), is the third in a series of tetra-hydoisoquinoline (TIQ) compounds that are precursors to novel chiral catalysts. The N-containing six-membered ring assumes a half-boat conformation. No hydrogen bonding is observed in the crystal structure.

In the title compound, C(37)H(35)NO(3), a precursor to novel chiral catalysts, the N-containing six-membered ring assumes a half-chair conformation. Inter-molecular C-H⋯O hydrogen bonds link the mol-ecules in the crystal structure.

In the title compound, C(26)H(27)NO(4), a precursor to novel chiral catalysts, the N-containing six-membered ring assumes a half-boat conformation. Various C-H⋯π interactions and intermolecular short contacts (C⋯H = 2.81-2.90 Å) link the mol-ecules together in the crystal structure.