Table 4.

Second-order rate constants (k₂) for the reactions of 2,5-bis(benzylidene)cyclopentanone (25) and 2,5-bis(2-hydroxybenzylidene)cyclopentanone (26) with sulfhydryl reagents

Sulfhydryl reagent	k2 × 103, M−1⋅sec−1		Ratio
	25	26
2-Mercaptoethanol	13.5	97.2	7.2
2,3-Dimercaptopropanol	35.4	48.2	1.4
1,2-Butanedithiol	9.04	18.1	2.0
1,4-Butanedithiol	3.08	11.8	3.8
2,3-Butanedithiol	3.23	4.57	1.4
1,4-Dithiothreitol	3.11	35.7	11.7
1,4-Dithioerythritol	2.30	29.3	12.7
GSH	9.26	87.3	9.4