125627-38-5Relevant articles and documents
THE SYNTHESIS OF CHIRAL ISOPROPYLIDENE DERIVATIVES OF 1,2,3-CYCLOHEXANETRIOLS BY ENZYMATIC DIFFERENTIATION
Dumortier, L.,Eycken, J. Van der,Vandewalle, M.
, p. 3201 - 3204 (1989)
2,3-O-Isopropylidene-1-cyclohexanol chiral building blocks have been prepared with high enantiomeric purities by enzymatic hydrolysis of their racemic acetates or n.butyrates.
A procedure for the preparation of Ti-Beta zeolites for catalytic epoxidation with hydrogen peroxide
Tang, Bo,Dai, Weili,Sun, Xiaoming,Guan, Naijia,Li, Landong,Hunger, Michael
, p. 2281 - 2291 (2014/04/17)
Ti-Beta zeolite has been successfully prepared via a reproducible and scalable two-step post-synthesis strategy, which consists of creating vacant T sites with associated silanol groups by dealumination of H-Beta and subsequent dry impregnation of the resulting Si-Beta with titanocene dichloride. The mechanism of Ti incorporation into the framework of Beta is investigated by diffuse reflectance infrared Fourier transform (DRIFT) and multinuclear solid-state nuclear magnetic resonance (SSNMR) spectroscopy. Characterization results obtained from diffuse reflectance ultraviolet-visible (UV-vis) and X-ray photoelectron spectroscopy (XPS) reveal that the majority of incorporated Ti species exist in the form of isolated tetrahedrally coordinated Ti(iv) in the zeolite framework while a minority exists in the form of isolated octahedrally coordinated Ti(vi) at framework or extra-framework positions. The obtained Ti-Beta zeolites are highly active and selective catalysts for the epoxidation of unsaturated ketones, e.g. 2-cyclohexen-1-one, with hydrogen peroxide as an oxidant. A quasilinear correlation between the epoxidation rate and the number of framework Ti(iv) species could be drawn evidencing that these Ti(iv) species are responsible for the epoxidation activity of the Ti-Beta zeolites under study. The impact of preparation parameters and reaction conditions on the catalytic performances of the Ti-Beta zeolites in the epoxidation of unsaturated organic compounds with hydrogen peroxide is discussed in detail. the Partner Organisations 2014.