... Carboxylic acid com- pounds that change chemical properties in response to external stimulation could allow reactivity control by small molecules. ... Chemistry Letters Vol.38, No.7 (2009) 667 Published on the web (Advance View) May 30, 2009; doi:10.1246/cl.2009.666
[Gabriele, Bartolo; Veltri, Lucia; Salerno, Giuseppe; Costa, Mirco; Chiusoli, Gian Paolo European Journal of Organic Chemistry, 2003 , # 9 p. 1722 - 1728]