Synthesis of 4-(N,N- dimethylamino)-3-aryl-3-butene-2-one, ethyl-5-aryl-4-oxo-4H-pyran-2-carboxylate, ethyl-5-aryl-4-pyridones-2-carboxylate and 5-aryl-3-cyano-5-methyl-2-pyridones (aryl=3-thienyl, 2-furyl) are described.

In the title compound, C(17)H(16)ClNO(2), the N=C-O-C-C fragment is planar within 0.029 (1) Å, and makes dihedral angles of 66.71 (8) and 59.61 (8)° with the planes of the chloro-phenyl and benzoyl rings, respectively. The carbonyl C=O bond is not coplanar with either of the aromatic rings; it makes angles of 42.5 and 23.5° with the normals to the ring planes. In the crystal, very weak C-H⋯O, C...

The title compound, C(17)H(19)NO(4), which is a non-toxic insect growth regulator with the common name fenoxycarb, contains two independent and conformationally different mol-ecules in the asymmetric unit. Although the inter-ring dihedral angles are similar [62.21 (15) and 63.00 (14)°], the side-chain orientations differ. In the crystal, the mol-ecules are linked through N-H⋯O hydrogen-bonding ...

The title compound, C(14)H(19)NO(4)S, was obtained in quanti-tative yield by Lewis acid-catalysed alcoholysis of a phtalimide precursor. An intra-molecular C-H⋯O hydrogen bond occurs. In the crystal, centrosymmetric dimers are formed by pairs of N-H⋯O hydrogen bonds between the sulfinyl O atoms and the carbamoyl N-H group of a neighboring mol-ecule. C-H⋯O inter-actions feature in the crystal st...

There are two mol-ecules in the asymmetric unit of the title compound, C(10)H(12)N(2)O(3), with identical conformations. Each independent mol-ecule is approximately planar and adopts a trans configuration with respect to the C=N double bond. Intra-molecular O-H⋯N hydrogen bonds are observed in both mol-ecules. The mol-ecules are linked into a ribbon-like structure running along the b axis by in...