Table 6 Alkene epoxidation with varied buffer salts

Entry^a	Buffer salts	Amount of buffer salts (mmol)	Initial reaction rate^b (mmol/L/h)	Conversion (%)^c	yield (%)^c
1	None	–	–	26.13 ± 0.25	6.52 ± 0.88
2	Na₂CO₃	3.5	–	82.95 ± 2.19	NA
3	Na₂HPO₄	3.5	198.07 ± 4.02	68.09 ± 1.88	46.71 ± 1.18
4	Na₃C₆H₅O₇	1	44.46 ± 1.05	40.46 ± 2.14	31.56 ± 0.11
5	Na₃C₆H₅O₇	3.5	232.88 ± 1.76	99.65 ± 0.07	92.04 ± 3.08
6	Na₃C₆H₅O₇	5	145.05 ± 2.23	94.32 ± 1.12	83.69 ± 4.23
7	None	–	–	3.11 ± 0.58	2.23 ± 0.56
9	Na₂HPO₄	3.5	5.17 ± 0.42	19.31 ± 0.88	8.56 ± 0.08
10	Na₃C₆H₅O₇	1	4.66 ± 0.95	10.72 ± 1.44	5.98 ± 0.8
11	Na₃C₆H₅O₇	3.5	5.12 ± 0.43	66.44 ± 0.91	56.24 ± 3.95
12	Na₃C₆H₅O₇	5	6.54 ± 1.21	61.53 ± 0.55	56.61 ± 0.93
13	None	-	-	5.13 ± 1.31	2.65 ± 0.78
15	Na₂HPO₄	3.5	9.21 ± 1.96	15.43 ± 0.37	8.75 ± 0.76
16	Na₃C₆H₅O₇	1	7.28 ± 1.5	16.06 ± 0.43	9.36 ± 0.73
17	Na₃C₆H₅O₇	3.5	9.59 ± 0.19	89.02 ± 0.64	76.56 ± 1.22
18	Na₃C₆H₅O₇	5	8.1 ± 1.41	84.87 ± 1.32	71.43 ± 2.36

^aA mixture of alkene (1 mmol), octanoic acid (1 mmol), cell (200 mg), H₂O₂ (30% aqueous solution, 7.5 mmol), 1−5 mmol buffer salts (Na₂CO₃, Na₂HPO₄, and Na₃C₆H₅O₇) in toluene (1.5 mL) was shaken at 180 rpm and 30 °C for different reaction time
^bThe value obtained at 30 min for pinene and 60 min for octene and styrene, respectively
^cThe value obtained at 6 h for pinene, 50 h for octene and 58 h for styrene, respectively

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