Measurements of ¹H ΔΔδ values of racemic chiral diols in the presence of boric acid D by ¹H NMR (400 MHz) in CDCl₃ at 25 °C^a.

Entry	Chiral diols	Spectrab	ΔΔδc (ppm)
1			0.39
2			0.18
3			0.10
4			0.11
5			0.11
6			0.23
7			0.27
8			0.18
9			0.11
10			0.17
11			0.08
12			0.06

^aAll samples were prepared by mixing boric acid D and chiral diols in NMR tubes (10 mM of the chiral diols and 30 mM of boric acid D in 0.6 mL of CDCl₃). ¹H NMR were collected on a Bruker Avance 400 MHz. Spectrometer at 25 °C.

^bThe configurations were determined by comparing with spectra of nonracemic sample of known configurations; the red and blue lines represent the S and R enantiomers of analytes, respectively (entry 1 red is (S,S) and blue is (R,R), entry 8 red is (−) and blue is (+)).

^cΔΔδ values of the proton H_A of the derivatives.