Reversible cyclodimerization of cyclic (alkyl)(amino)carbene-carbon disulfide adduct

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Dynamic covalent chemistry utilizes reversible bond formation for adaptive materials.
• Sulfur-sulfur bonds are typically stable and not easily manipulated dynamically.
• Carbene-carbon disulfide adducts offer a unique platform for exploring novel reactivity.

Purpose of the Study:

• To investigate the thermal and photochemical behavior of cyclic (alkyl)(amino)carbene-carbon disulfide adducts.
• To explore the formation of 1,2,4,5-tetrathianes from these adducts.
• To demonstrate stimulus-responsive, reversible bond cleavage and formation.

Main Methods:

• Synthesis of cyclic (alkyl)(amino)carbene-carbon disulfide adducts.
• Thermal cyclodimerization experiments.
• Photochemical dissociation studies using light irradiation.

Main Results:

• The adducts quantitatively cyclodimerize to form 1,2,4,5-tetrathianes upon heating.
• Irradiation with light quantitatively dissociates the tetrathianes back to the starting adducts.
• This process is reagent-free and stimulus-driven, offering high reversibility.

Conclusions:

• A novel system for reversible bond formation and cleavage based on carbene-carbon disulfide adducts was developed.
• The demonstrated thermal and photochemical control over tetrathiane formation and dissociation provides a new paradigm in dynamic covalent chemistry.
• This work opens avenues for stimuli-responsive materials and chemical transformations.