Novel small organo-P-S/Se heterocycles

Area of Science:

• Organophosphorus Chemistry
• Heterocyclic Chemistry
• Main Group Chemistry

Background:

• Cyclomonocarbatetraphosphines are versatile precursors in heterocyclic synthesis.
• Oxidative addition reactions offer pathways to novel ring systems.

Purpose of the Study:

• To investigate the oxidative addition of elemental sulfur and selenium to cyclomonocarbatetraphosphines.
• To synthesize and characterize new phosphorus-containing heterocycles.

Main Methods:

• Reaction of cyclomonocarbatetraphosphines (PhP)4CR2 with elemental sulfur (S) and selenium (Se).
• Isolation and characterization of the resulting heterocyclic products.

Main Results:

• Formation of novel five-membered heterocycles of the type PhP(E)CH2PhP(E)E2 (E = S, Se).
• Synthesis of novel four-membered heterocycles of the type PhP(Se)CMe2-PhP(Se)Se.
• Demonstration of selective incorporation of sulfur and selenium into the phosphine framework.

Conclusions:

• Elemental sulfur and selenium undergo oxidative addition to cyclomonocarbatetraphosphines.
• This reaction provides access to unique five- and four-membered phosphorus-sulfur and phosphorus-selenium heterocycles.
• The study expands the scope of heterocyclic synthesis involving main group elements.