1. o-Phenylenediamine as a New Catalyst in the Highly Regioselective Conversion of Epoxides to Halohydrins with Elemental Halogens
2. Über
N
‐Chinhydrone
3. Über die Katalytischen Wirkungen des Jods
4. Baczyński W, Niementowski S (1902) Chem Zentralbl 73 (II): 940; Beilstein Database BS0402AE, Reaction ID 73932
5. 10 or even 20 mol% of o-phenylenediamine is obviously not enough for optimum yields of iodohydrins. First of all, this is inconsistent with stoichiometry of the oxidation of o-phenylenediamine by iodine, which could give only six hydrogen iodide molecules per two moles of o-phenylenediamine. According to the reaction described in Scheme 1, two moles of o-phenylenediamine give six moles of hydrogen iodide, therefore the proper stoichiometry should be two moles of o-phenylenediamine per three moles of iodine (and respectively six moles of epoxide). It is not less than 33 mol%. Another question remains: if the o-phenylenediamine is only a catalyst but not a reagent, where the hydrogens came from?