Thermodynamic and Extrathermodynamic Studies of Enantioseparation of Imidazolinone Herbicides on Chiralcel OJ Column

Table 6

Δ(Δ𝐻^∘_𝑒)_𝑖−𝑗 versus Δ(Δ𝑆^∘_𝑒)_𝑖−𝑗 associated with various functionary substitutions using 85/15, 80/20, 75/25, 70/30, and 60/40 mobile phases.

Pairs of compound	Changes of functional group	𝑆(−)		𝑅(+)
	IN/OUT	Slop	𝑟^2	Slop	𝑟^2
Imazapyr-imazapic	CH3/H	134	0.727	156	0.173
Imazapyr-imazethapyr	CH3CH2/H	94	0.401	309	0.515
Imazapyr-imazamox	CH3OCH2/H	343	0.998	341	0.999
Imazapyr-imazaquin	C4H4/H	318	1	243	0.987
Imazapic-imazethapyr	CH3CH2/CH3	−0.9	0	359	0.857
Imazapic-imazamox	CH3OCH2/CH3	241	0.998	265	0.999
Imazapic-imazaquin	C4H4/CH3	371	0.974	363	0.993
Imazethapyr-imazamox	CH3OCH2/CH3CH2	202	0.978	221	0.995
Imazethapyr-imazaquin	C4H4/CH3CH2	397	0.932	393	0.975
Imazamox-imazaquin	C4H4/CH3OCH2	326	1	304	0.999