title: Squaramide equilibrium acidities in DMSO.
abstract: A number of popular squaramide organocatalysts' acidities were determined by an overlapping indicator method in DMSO via UV spectrophotometric titrations. The pKa values are in the range of 8.37-16.46. The results may be helpful for the rational design and development of squaramide type new catalysts.
authors.affiliation: State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, and Collaborative Innovation Center of Chemical Science and Engineering , Tianjin 300071, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Ni
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.forename: Jin-Pei
authors.initials: JP
authors.lastname: Cheng