This prefix properly denotes replacement of an oxygen by a sulfur, e.g. PhC(=S)NH2, thiobenzamide. See also entries prefixed thio-.
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1371 [Terms] [Paper]
Citation: 'thio' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.T06347 RISBibTexEndNote