TABLE 3.

Effect of acyl donor structure on the acylation of polydatin catalyzed by Fe₃O₄-PDA-TLL.

Entry	Acyl donor	Acyl group	V0 (mM/h)	Time (h)	C (%)	OH a -regioselectivity (%)
1	Vinyl butyrate		9.8 ± 0.4	14.0	98.1 ± 0.1	100
2	Vinyl crotonate		4.7 ± 0.1	18.0	90.1 ± 0.2	100
3	Vinyl pivalate		n.d	6.0	―	―
4	Vinyl hexanoate		12.3 ± 0.4	14.0	98.1 ± 0.4	100
5	Vinyl sorbate		6.3 ± 0.2	18.0	91.3 ± 0.3	100
6	Vinyl benzoate		n.d	6.0	―	―
7	Vinyl octanoate		12.4 ± 0.3	14.0	98.4 ± 0.2	100
8	Vinyl 2-ethylhexanoate		n.d	6.0	―	―
9	Vinyl decanoate		12.6 ± 0.4	14.0	98.7 ± 0.5	100
10	Vinyl undecenoate		13.9 ± 0.5	14.0	98.8 ± 0.6	100
11	Vinyl laurate		13.7 ± 0.6	14.0	99.1 ± 0.5	100
12	Vinyl myristate		12.8 ± 0.3	14.0	97.5 ± 0.3	100
13	Vinyl palmitate		12.6 ± 0.2	14.0	97.5 ± 0.4	100
14	Vinyl stearate		11.2 ± 0.3	14.0	96.0 ± 0.5	100

The reactions were carried out at 55°C and 200 rpm by adding 0.03 mmol polydatin, 0.33 mmol vinyl donor, 180 mg Fe₃O₄-PDA-TLL, into 3.0 ml anhydrous MeTHF.

^aPrimary hydroxyl.