Task: Text Categorization
Input (English): One of these functional groups can be added to a terminal alkyne, frequently catalyzed by copper(I), in what has been referred as the paradigm of click chemistry by K. Barry Sharpless. That is a 1,3-dipolar reaction known as the Huisgen cycloaddition, which results in a 1,2,3-triazole. One of these is reacted with tri-phenyl-phosphine in the Staudinger reaction; that reaction results in tri-phenyl-phosphine oxide and a reduced version of this functional group. These are defined as compounds containing the group N3 with one nitrogen attached to a parent structure. FTP, name this functional group which can be reduced to amines.
Output (English): Science