227 g/equiv), dihydrocoumarin (DHC, ≥98%), butyl glycidyl ether
(BGE, 99%), poly(ethyleneglycol) diglycidyl ether (PEGDE, average Mn 500), (S,S)-N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediaminochromium(III)
chloride, bis(triphenylphosphoranylidene)ammonium chloride, and dicyandiamide
(DICY) were all purchased from Sigma-Aldrich.