Table 7.

Summary of results for acidity bracketing of B (6).

Reference compound	ΔHacida	Proton transferb
		Ref. acid	Conj. base
methacrylic acid	344.1 ± 2.9	–	+
2,4-pentanedione	343.8 ± 2.1	–	+
methyl cyanoacetate	340.80 ± 0.60	+	–
trifluoro-m-cresol	339.2 ± 2.1	+	–
malononitrile	335.8 ± 2.1	+	–

^aAcidities are in kcal mol⁻¹.^31,32

^bA “+” indicates the occurrence and a “–” indicates the absence of proton transfer.