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. Author manuscript; available in PMC: 2020 May 1.

Published in final edited form as: Synthesis (Stuttg). 2019 Mar 12;51(10):2107–2115. doi: 10.1055/s-0037-1612217

Figure 2: — NMR titrations of silanediol 1a (a), thiourea 11 (c), and squaramide 12 (e) with TBAOTf in CDCl₃. b) Change in 2.33 ppm (-OH) when silanediol 1a was titrated with [G] = TBACl () and TBAOTf (). d) Change in 8.62 ppm (-NH) when thiourea 11 was titrated with [G] = TBACl () and TBAOTf (). f) Change in 9.78 ppm (-NH) when squaramide 12 was titrated with [G] = TBACl () and TBAOTf ()

Inline graphic — NMR titrations of silanediol 1a (a), thiourea 11 (c), and squaramide 12 (e) with TBAOTf in CDCl₃. b) Change in 2.33 ppm (-OH) when silanediol 1a was titrated with [G] = TBACl () and TBAOTf (). d) Change in 8.62 ppm (-NH) when thiourea 11 was titrated with [G] = TBACl () and TBAOTf (). f) Change in 9.78 ppm (-NH) when squaramide 12 was titrated with [G] = TBACl () and TBAOTf ()