Etheric C–O Bond Hydrogenolysis Using a Tandem Lanthanide Triflate/Supported Palladium Nanoparticle Catalyst System
摘要:
Selective hydrogenolysis of cyclic and linear ether C-O bonds is accomplished by a tandem catalytic system consisting of lanthanide triflates and sinter-resistant supported palladium nanoparticles in an ionic liquid. The lanthanide triflates catalyze endothermic dehydroalkoxylation, while the palladium nanoparticles hydrogenate the resulting intermediate alkenols to afford saturated alkanols with high overall selectivity. The catalytic C-O hydrogenolysis is shown to have significant scope, and the C-O bond cleavage is turnover-limiting.
[DE] GLYCERINOCTYLETHER IN TENSIDMISCHUNGEN<br/>[EN] GLYCERIC OCTYL ETHERS IN SURFACE-ACTIVE MIXTURES<br/>[FR] OCTYLETHERS DE GLYCERINE UTILISES DANS DES MELANGES TENSIOACTIFS
申请人:HENKEL KOMMANDITGESELLSCHAFT AUF AKTIEN
公开号:WO1995014073A1
公开(公告)日:1995-05-26
(DE) Glycerin-mono- und -dioctylether bewirken in flüssigen Tensidmischungen, insbesondere Flüssigwaschmitteln, enthaltend anionische und nichtionische Tenside, Viskositätserhöhung und Schauminhibierung. Die Schauminhibierung ist auch in pulverförmigen Waschmitteln zu beobachten.(EN) Glyceric mono and dioctyl ethers in liquid surface active mixtures, especially liquid detergents, containing anionic and nonionic surfactants increase viscosity and inhibit foaming. The foam-inhibiting action can also be observed in powdered detergents.(FR) Les mono-octyléthers et dioctyléthers de glycérine présents dans des mélanges tensioactifs liquides, notamment des détergents liquides, contenant des tensioactifs anioniques et non ioniques, en augmentent la viscosité et ont une action antimousse que l'on remarque également dans les détergents pulvérulents.
能 municipality mono- und -dioxide 三醇醚在液态表面活性剂混合物中,尤其存在于液态清洁剂中,含有离解型和非离解型表面活性剂,能增加粘度并抑制泡沫。泡沫抑制作用也可观察到在粉状清洁剂中。
Micellar effects in the nitrous acid deamination reaction of (R)-[1-2H]-1-octanamine
作者:Daniel Brosch、Wolfgang Kirmse
DOI:10.1021/jo00057a025
日期:1993.2
The nitrous acid deamination of 1-octanamine (1) afforded mixtures of isomeric octenes, octanols, and octyl nitrites. The aggregation of 1.HClO4 in micelles induced the formation of dioctyl ethers and of 1-nitrooctane as additional products. In homogeneous solution (submicellar aqueous conditions or HOAc), [1-H-2]-1-octanol was obtained from [1-H-2]-1 with ca. 95% inversion of configuration. Above the critical micelle concentration, the enantiomeric purity of [1-H-2]-1-octanol decreased while [1-H-2]-1-nitrooctane was formed with ca.90% retention of configuration. 1-Octyl..NO2 radical pairs, rather than ion pairs, are likely to intervene on the retentive route to 1-nitrooctane and 1-octyl nitrite. Equilibration, via NO exchange, of (R)-[1-H-2]-1-octyl nitrite with the more abundant (S)-[1-H-2]-1-octanol is thought to account for the diminished ee of both products.
Schlenk,W., Justus Liebigs Annalen der Chemie, 1973, p. 1156 - 1178
作者:Schlenk,W.
DOI:——
日期:——
Etherification of Alcohols in the Absence of Solvent: Catalytic Function of Polyethers in a Solid/Liquid Medium
作者:B. Abribat、Y. Le Bigot、A. Gaset
DOI:10.1080/00397919408010220
日期:1994.8
The catalytic action of etherified polyethylene glycols associated with a precise degree of hydration of the reacting medium allows the successful transformation of primary or secondary alcohols into corresponding ethers using very simple operating conditions.
1,2,4-Triazol-3-ylidenes with an<i>N</i>-2,4-Dinitrophenyl Substituent as Strongly π-Accepting N-Heterocyclic Carbenes
作者:Tetsuo Sato、Yoichi Hirose、Daisuke Yoshioka、Tsubasa Shimojo、Shuichi Oi
DOI:10.1002/chem.201302567
日期:2013.11.11
AbstractThe synthesis and characterisation of a series of new Rh and Au complexes bearing 1,2,4‐triazol‐3‐ylidenes with a N‐2,4‐dinitrophenyl (N‐DNP) substituent are described. IR, NMR, single‐crystal X‐ray diffraction and computational analyses of the Rh complexes revealed that the N‐heterocyclic carbenes (NHCs) behaved as strong π acceptors and weak σ donors. In particular, a natural bond orbital (NBO) analysis revealed that the contributions of the Rh→Ccarbene π backbonding interaction energies (ΔEbb) to the bond dissociation energies (BDE) of the RhCcarbene bond for [RhCl(NHC)(cod)] (cod=1,5‐cyclooctadiene) reached up to 63 %. The Au complex exhibited superior catalytic activity in the intermolecular hydroalkoxylation of cyclohexene with 2‐methoxyethanol. The NBO analysis suggested that the high catalytic activity of the AuI complex resulted from the enhanced π acidity of the Au atom.