Synthesis, Characterization, and Catalytic Properties of Mesoporous Tin-Containing Analogs of MCM-41

In Situ Preparation of Functional Heterogeneous Organotin Catalyst Tethered on SBA-15

“…This is consistent with our experimental result that two bands around 252 and 285 nm (Fig. 4B), assigned to the small and polymeric hexa-coordinated Sn species respectively [22], were observed in the DR UV-vis spectra of the extracted samples such as the Sn 54 -SBA-15. This suggests that at least two types of clusters were formed.…”

Selective and Shape-Selective Baeyer–Villiger Oxidations of Aromatic Aldehydes and Cyclic Ketones with Sn-Beta Zeolites and H2O2

“…Sn-silicalite (MEL and MFI type) and Sn-MCM-41 have been reported to give 119 Sn chemical shifts d between À 670 and À 740; [26±30] these spectra were usually recorded on hydrated samples, and the signals were attributed to framework Sn IV sites [26±30] either in octahedral [26,28,30] or in tetrahedral [27,29] coordination. The 119 Sn NMR spectrum of dehydrated zeolite Sn-MFI gives a very broad band with the maximum at d À 688 attributed to octahedral Sn IV , and a shoulder at d À 439 assigned to framework tetrahedral sites which shifts to d 579 when the coordination increases to five upon hydration.…”

A New Environmentally Benign Catalytic Process for the Asymmetric Synthesis of Lactones: Synthesis of the Flavouring δ‐Decalactone Molecule

“…[1] In the course of the exciting oxidation chemistry with TS-1, other metals have been incorporated into molecular sieves, such as vanadium, chromium, zinc, iron, and tin, the latter with an increasing number of applications in recent years. Several patents and reports have appeared on the hydroxylation of phenol with Snsilicalite, [3] Sn-MCM-41 [4] and tin incorporated in other zeolite structures. [5] However, when the results are compared with titanium incorporated into the same molecular sieve the titanium-containing materials always perform better [3b] or much better.…”