𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Site of protonation in the reaction of gaseous Brønsted acids with halobenzene derivatives

✍ Scribed by Wie Giap Liauw; Alex G. Harrison

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
570 KB
Volume
16
Category
Article
ISSN
1076-5174

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Solid-state NMR studies of the geometry
Solid-state NMR studies of the geometry of brønsted acid sites in zeolitic catalysts
✍ Dieter Freude; Jacek Klinowski; Halimaton Hamdan 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 673 KB

H 2'AI and %i solid-state NMR was used to determine the geometry of the Brsnsted acid site in zeolites. The mean distance between acidic protons in bridging hydroxyl groups and the nearest framework Al atom is 2.38 ? 0.04 8, in zeolite H-Y and 2.48 2 0.04 A in H-ZSM-5. The quadrupole frequency of fr

Infrared spectroscopic study of the bend
Infrared spectroscopic study of the bending modes of the Brønsted acidic sites in deuterated zeolites
✍ W.P.J.H. Jacobs; J.H.M.C. van Wolput; R.A. van Santen 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 425 KB

Deuteration of Bronsted acidic sites in zeolites gives observable infrared in-plane O-D bending modes. For zeolite Y and ZK-5, a maximum near 870 cm-' with a shoulder near 890 cm-' is observed. These signals arc related to, respectively, the highfrequency and the low-frequency stretching modes. Mord

Metal-Catalyzed Oxidations, 4. The React
Metal-Catalyzed Oxidations, 4. The Reaction of Molybdenumperoxo Complexes with Brønsted and Lewis Acids
✍ Thiel, Werner R. 📂 Article 📅 1996 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 526 KB

Molybdenum complexes / Peroxo complexes / Catalysis / Olefin epoxidation / Proton transfer NMR studies of the reaction of complexes of the type (L-L ) M O O ( O ~) ~ (L-L = bidentate ligand) with strong Brensted and Lewis acids prove that protons are transferred preferentially to an q2-peroxo and n

Brønsted sites in zeolitic catalysts. An
Brønsted sites in zeolitic catalysts. An ab initio study of local geometries and of the barrier for proton jumps between neighbouring sites
✍ J. Sauer; C.M. Kölmel; J.-R. Hill; R. Ahlrichs 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 500 KB

Complete geometry optimizations were performed on the equilibrium structure (C,) of the H$iOH-AI (OH )r0SiH3 model of bridged hydroxyls in zeolites as well as on the transition structure (C,,) for moving the proton within this model from one SiOAl site to the other. The calculations (DZP basis set,

1H solid-state NMR studies of the geomet
1H solid-state NMR studies of the geometry of Brønsted acid sites in zeolites H-ZSM-5
✍ Michael Hunger; Dieter Freude; Dieter Fenzke; Harry Pfeifer 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 419 KB

Broad-line 'H NMR and 'H MAS NMR were used to determine the geometry of the Bransted acidic sites in zeolites H-ZSM-5. The signals obtained correspond to bridging hydroxyl groups in Si-OH-Al arrangements with an H-Al distance of 0.246-0.252 nm. The concentration of hypothetical SiOHSi groups must be