Latest synthetic methods of six-membered selenium-containing heterocycles are reviewed.

Intramolecular homolytic substitution at selenium is an interesting methodology.

Selenium electrophiles are valuable reagents for construction of selenium-containing heterocycles.

Selenamides and isoselenocyanates are valuable building blocks for different selenazines.

Selenium-containing dyes are promising photosensitizers for photodynamic therapy (PDT).