MAIN-GROUP-BASED RINGS AND POLYMERS

Relatively unexplored areas of main-group chemistry continue to offer fertile ground for interesting fundamental and applied science. This a rticle reviews recent investigations of boron-nitrogen-phosphorus and sulfur(IV)-nitrogen-phosphorus ring chemistry which have led to the di scovery of new pseudo-aromatic heterocycles, skeletal substitution rea ctions, and novel inorganic polymer systems with potential application s as pressure sensing composites in the aerospace industry (see cover illustration).