1,4-Di­methyl­piperazine-2,3-dione

In the title compound, C₆H₁₀N₂O₂, the piperazine-2,3-dione ring adopts a half-chair conformation. In the crystal, the mol­ecules are linked by weak C—H⋯O hydrogen bonds, forming (010) sheets.

4-Bromo-N,N′-di­phenyl­benzimidamide N′-oxide

Bright-yellow single crystals of the title compound were synthesized as part of a project that explores the formation of earth-abundant transition-metal complexes of amidine oxides (AMOXs), to study their photophysical and redox properties. The HNCNO moiety of the compound shows double-bond delocalization over the N—C—N part, evident from the similar C—N bond distances.

Methyl 2-[(Z)-5-methyl-2-oxoindolin-3-yl­idene]hydrazinecarbodi­thio­ate

The crystal structure of a new S-methyl substituted di­thio­carbazate imine containing the 5-methyl­isatin moiety is described.

(Z)-N-(2,6-Di­methyl­phen­yl)-1-[(2-meth­oxy­phen­yl)amino]­methanimine oxide methanol monosolvate

The crystal structure of a zwitterionic unsymmetrical hy­droxy­formamidine methanol monosolvate is reported.

(Z)-N-(2,6-Diiso­propyl­phen­yl)-1-[(2-meth­oxyphen­yl)amino]­methanimine oxide

The crystal structure of a zwitterionic, non-symmetric hy­droxy­formamidine derivative is described.

2-Chloro-N-(4-hy­droxy­phen­yl)acetamide

The title compound is significantly distorted from planarity, with a twist angle between the planes through the hy­droxy­benzene and acetamide groups being 23.5 (2)°. This conformation is supported by intra­molecular C—H⋯O and N—H⋯Cl contacts. In the crystal, N—H⋯O hydrogen-bonding contacts between acetamide groups and O—H⋯O contacts between hydroxyl groups form tapes propagating parallel to [103].

meso-5,15-Bis[3-(iso­propyl­idenegalacto­pyran­oxy)phen­yl]-10,20-bis­(4-methyl­phen­yl)porphyrin

The crystal structure, non-bonding inter­actions and packing features of a novel galactose conjugated porphyrin are presented and discussed.

(1H-Benzo­diazol-2-ylmeth­yl)di­ethyl­amine

In the crystal of the title compound, the mol­ecules are linked by N—H⋯N hydrogen bonds, generating a C(4) chain extending along the c-axis direction.

1-Eth­oxy-3-[4-(eth­oxy­carbon­yl)phen­yl]-3-hy­droxy-1-oxopropan-2-aminium chloride

The title compound was prepared as a racemate of R,R- and S,S-enanti­omers by reduction of the corresponding hy­droxy­imino­ketone. In the crystal, layers are formed via hydrogen bridges of four ammonium groups to chloride ions; these lamellae are connected via inter­digitated benzoic ester groups.

Benzilic acid: a monoclinic polymorph

The asymmetric unit contains two complete mol­ecules. Classical hydrogen bonds, as well as C—H⋯O contacts, connect the mol­ecules to infinite chains along the c-axis direction.