𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Catalytic and asymmetric epoxidation of unfunctionalized alkenes with hydrogen peroxide and (Salen)Mn(III) complexes

✍ Scribed by Pekka Pietikäinen

Publisher
Elsevier Science
Year
1994
Tongue
French
Weight
311 KB
Volume
35
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis

Catalytic epoxidation of two unfunctionalized alkenes, 1,2_dihydronaphthalene and tranx-e-methylstyrene, is reported using achiral and chirol (Salen)Mn(III) complexes l-3 together with a nitrogen heterocycle as axial ligand in the presence of 30 %I aqueous hydrogen peroxide as oxidant. Typically, the reaction system consisted of the substrate, oxidant, ligand, and salen in a ratio of 1: 2-3.5: 0.4: 0.025-0.05. The best ligands were imidazole and N-methyl imidazole. The highest ee-values obtained were 60 7% for 1,2-dihydronaphthalene oxide and 47 'Ib for truns-P-methylstyrene oxide.

📜 SIMILAR VOLUMES

Convenient asymmetric (salen)Mn(III)-cat
Convenient asymmetric (salen)Mn(III)-catalyzed epoxidation of unfunctionalized alkenes with hydrogen peroxide using carboxylate salt cocatalysts
✍ Pekka Pietikäinen 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 511 KB

Asymmetric epoxidation of unfunctionalized alkenes is reported using chiral (salen)Mn(III) complexes 1-$ together with a carboxylate salt cocatalyst in the presence of either aqueous H202 or anhydrous urea-H202 adduct as oxidant. Several simple soluble salts (acetates, formates, benzoates) were stud

Asymmetric Mn(III)-salen catalyzed epoxi
Asymmetric Mn(III)-salen catalyzed epoxidation of unfunctionalized alkenes with tetrabutylammonium monopersulfate
✍ Pekka Pietikäinen 📂 Article 📅 1999 🏛 Elsevier Science 🌐 French ⚖ 199 KB

Asymmetric Mn(III)-salen catalyzed epoxidation of simple cis-disubstituted and trisubstituted alkenes in mild conditions was performed using tetrabutylammonium monopersulfate (Bu4NHSO5) as the oxidant together with N-methylmorpholine N-oxide as an additive. Particularly high yields of epoxides (up t