N-carboxy-L-aspartic anhydride benzyl ester

Area of Science:

• Crystallography
• Solid-state chemistry
• Polymerization

Background:

• Understanding solid-state polymerization mechanisms is crucial for materials science.
• The title compound, benzyl (1,2,3,4-tetrahydro-2,5-dioxo-1,3-oxazol-4-yl)acetate, exhibits polymerization in the solid state.
• Structural insights are needed to elucidate this phenomenon.

Purpose of the Study:

• To determine the crystal structure of benzyl (1,2,3,4-tetrahydro-2,5-dioxo-1,3-oxazol-4-yl)acetate.
• To correlate the determined structure with the observed solid-state polymerization.
• To provide a structural basis for the compound's reactivity.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the molecular and crystal structure.
• Analysis of intermolecular and intramolecular hydrogen bonding interactions.
• Examination of molecular packing and arrangement within the crystal lattice.

Main Results:

• The crystal structure reveals intermolecular hydrogen bonds linking molecules along the c axis via imino and carbonyl groups.
• Intramolecular hydrogen bonds are also present between the imino and ester carbonyl groups.
• A layered arrangement was observed, with five-membered rings in one layer and benzyl groups in adjacent layers.

Conclusions:

• The determined crystal structure, featuring layered arrangements and specific hydrogen bonding, is conducive to solid-state polymerization.
• The proximity and orientation of the five-membered rings within the layers facilitate intermolecular reactions.
• This structural understanding explains the observed polymerization behavior of the title compound.