O toluic acid

l-Phenylalanine (99%), 2-phenylethanol (99%), phenylacetaldehyde (90%), shikimic acid (99%), sodium phenylpyruvate (powder), chorismic acid barium salt (≥ 80%), o-toluic acid (99%), m-toluic acid (99%), p-fluoro-dl-phenylalanine (FPA) (98%), Viscozyme^Rl-cellulolytic enzyme mixture and ethylmethanesulfonate (EMS) were purchased from Sigma-Aldrich (Merck). Acetonitrile (HPLC grade), d-( +)-xylose and d-( +)-glucose were provided by VWR Chemicals (France).

The Mn-cat complex was synthesized according to the protocol described by Fernandez et al. in 2007 [31 (link)]. TEOS was purchased from abcr (Karlsruhe, Germany); hexadecyltrimethylammonium p-toluenesulfonate (CTATos) was purchase from Merck (Darmstadt, Germany); 2-(4-pyridylethyl)triethoxysilane (1,4-pyr) was purchased from fluorochem (Hadfield, UK); 3-dimethyl(3-trimethoxysilyl)propyl)-ammonio)propane-1-sulfonate (SBS) was purchased from Gelest (Morrisville, NC, USA); Mn(NO₃)₂·4H₂O was purchased from Alfa-Aesar (Ward Hill, MA, USA); 2,2-bipyridine was purchased from TCI Europe (Zwijndrecht, Belgium); NBu₄Br was purchased from Fluorochem (Hadfield, UK); o-toluic acid, KMnO₄, ammonium nitrate and triethanolamine (TEAH₃) were purchased from Sigma-Aldrich (Steinheim, Germany).