Potassium hydroxide koh

Tungsten(VI) chloride (WCl₆) and (trimethylsilyl)diazomethane (TMSD; 2 M in diethyl ether) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Tetraphenyltin (Ph₄Sn) and L-(−)- and D-(+)-mandelic acids were obtained from Tokyo Chemical Industry (TCI; Tokyo, Japan). Potassium hydroxide (KOH) and 2-methoxy-4-nitrobenzoic acid were purchased from FUJIFILM Wako Pure Chemical (Osaka, Japan). Optically active amines (2a to 2i, 2k to 2r, 2t₁ to 2t₁₀, 2u, and 2a^Me) (Fig. 3 and fig. S3) were obtained from Sigma-Aldrich, FUJIFILM Wako Pure Chemical, TCI, Nacalai Tesque (Kyoto, Japan), and Watanabe Chemical Industries (Hiroshima, Japan) and used as received except for 2a (see the Supplementary Materials). (1S,2R)- and (1R,2S)-norephedrine (1S2R- and 1R2S-2s) were purchased from FUJIFILM Wako Pure Chemical. (S)- and (R)-amphetamine (S- and R-2j) (34 ) and (1S,2S)- and (1R,2R)-norpseudoephedrine (1S2S- and 1R2R-2s) (35 ) were synthesized from the corresponding norephedrine according to the literature method. Anhydrous THF, toluene, DMSO, and DMF were purchased from Kanto Kagaku (Tokyo, Japan), and these solvents were stored under nitrogen. Dehydrated acetone and MIK were obtained from FUJIFILM Wako Pure Chemical. DMT-MM was prepared according to the reported method (36 ). Poly-1-H was prepared according to the previously reported method (see the Supplementary Materials) (28 (link), 29 ).

PCL (M_w = 10,000 g/mol), DBPO, MA (M_w = 98.06 g/mol), tetrahydrofuran (THF), hexane, potassium hydroxide (KOH), ethanol (C₂H₅OH) and phenolphthalein ethanol solution (1.0% w/v) were purchased from Fujifilm Wako Pure Chemical (Osaka, Japan). A filter paper (No.4, Monotaro, Kiriyama, Japan) was utilized for the experiment.