The Single Bonded Chalcogen Is Bonded Directly To An Additional Carbon, Which Carbon May Be Single Bonded To Any Atom But May Be Multiple Bonded Only To Carbon (i.e., Thiocarboxy Esters) Patents (Class 508/444)
Chalcogen bonded directly to the carbon of the -c(=x)x-group (e.g., xanthate esters, trithiocarbonate esters, etc.) (Class 508/445)