Chalcogen Attached Indirectly To The Phosphorus By Acyclic Nonionic Bonding Patents (Class 558/169)
- Nitrogen bonded directly to the phosphorus (Class 558/171)
- The -C(=X)- is part of a -C(=X)X- group, wherein the X's may be the same or diverse chalcogens (Class 558/172)
- Chalcogen, or additional -C(=X), bonded directly to the nitrogen (Class 558/173)
- Two carbons bonded directly to the same chalcogen (e.g., sulfones, carboxylic acid esters, ethers, etc.) (Class 558/174)