2-Benzyl-5-meth­oxy­isoindoline-1,3-dione

The title N-benzyl­phthalimide derivative, C₁₆H₁₃NO₃, consists of two planar moieties, viz. the phthalimide system (r.m.s. deviation = 0.007 Å) and the phenyl ring, which make a dihedral angle of 84.7 (6)°. The meth­oxy group is almost coplanar with the phathalimide ring, as shown by the C—C—O—C torsion angle of −171.5 (2)°. In the crystal, the mol­ecules are self-assembled via non-classical C—H...O hydrogen bonds, forming a tape motif along [110].

5-[(tert-Butyl­diphenyl­sil­yloxy)meth­yl]pyridazin-3(2H)-one

In the title compound, C₂₁H₂₄N₂O₂Si, a new pyridazin-3(2H)-one derivative, the carbonyl group of the heterocyclic ring and the O atom of the silyl ether are located on the same side of the pyridazinone ring and the C—C—O—Si torsion angle is −140.69 (17)°. In the crystal, mol­ecules are linked by pairs of strong N—H...O hydrogen bonds into centrosymmetric dimers with graph-set notation R₂²(8). Weak C—H...π inter­actions are also observed.

4-[(tert-Butyl­diphenyl­sil­yloxy)meth­yl]pyridazin-3(2H)-one

In the title compound, C₂₁H₂₄N₂O₂Si, the carbonyl group of the heterocyclic ring and the O atom of the silyl ether group are placed toward opposite sides and the tert-butyl and pyridazinone moieties are anti-oriented across the Si—O bond [torsion angle = −168.44 (19)°]. In the crystal, mol­ecules are assembled into inversion dimers through co-operative N—H...O hydrogen bonds between the NH groups and O atoms of the pyridazinone rings of neighbouring mol­ecules. The dimers are linked by π–π inter­actions involving adjacent pyridazinone rings [centroid–centroid distance = 3.8095 (19) Å], generating ladder-like chains along the b-axis direction. The chains are further linked into a two-dimensional network parallel to the ab plane through weak C—H...π inter­actions.