Results Eleven of the thirteen A2-thiazolines (Figure 1) examined in the course of this work exhibit a characteristic bell-shaped dependence of observed firstorder rate constant (kobsd) for initial rate of thiazoline hydrolysis upon pH. This behavior, described by Martin6 'r9 for 2- alkylthiazolines, is thus also shown by 2-arylthiazolines (except for compounds 1 and 2, to be discussed later) and is illustrated for four substances in Figure 2. Both the position of ...
