Task: Text Categorization
Input (English): Tri-phenyl-phosphine and diethyl azo-di-carboxylate are used to transform this class of organic compounds into other compounds such as esters and various types of ethers via the Mitsunobu reaction. An ester can also be formed from a carboxylic acid and one of these with the help of an acidic catalyst in a process known as Fischer esterification, and they must be made into good leaving groups, often with tosylate or mesylate, before they can undergo nucleophilic substitution. For 10 points, identify this class of organic compounds, represented by the general formula R-OH.
Output (English): Science