The title compound, C(11)H(11)ClN(2)O(4), is an important inter-mediate for the preparation of platinum anti-cancer drugs. The dioxolane ring adopts a twist conformation with an equatorially attached chloro-phenyl substituent. In the crystal structure, mol-ecules are linked into a two-dimensional network parallel to (001) by N-H⋯O and C-H⋯O hydrogen bonds.

Stereoselective formation of substituted 1,3-dioxolanes was achieved through an assembly of three components: alkene, carboxylic acid and silyl enol ether. The reaction proceeded via stereospecific generation of a 1,3-dioxolan-2-yl cation intermediate during oxidation of alkene substrates with hypervalent iodine. The stereoselective trapping of the cation intermediate with silyl enol ether comp...

In the title compound, C(12)H(14)N(2)O(5), the five-membered 1,3-dioxolane ring has a twisted conformation. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a two-dimensional network lying parallel to the ab plane. There are also C-H⋯π inter-actions present in the crystal structure.

In the title compound, C(15)H(17)NO(8), the nitro group is essentially coplanar with the aromatic ring [dihedral angle = 6.4 (3) Å]. The five-membered ring has a twist conformation. In the crystal, C-H⋯O inter-actions link the mol-ecules into a helical chain propagating along [010].

In the title compound, C(12)H(14)N(2)O(5), the five-membered ring adopts an envelope conformation. In the crystal structure, inter-molecular N-H⋯O inter-actions link the mol-ecules into a three-dimensional network. A weak C-H⋯π inter-action is also found.