Ketone Hydrosilylation with Sugar Silanes Followed by Intramolecular Aglycone Delivery: An Orthogonal Glycosylation Strategy

Gettin' a little sugar—no alcohol required : A procedure for the direct glycosylation of ketones without a hydroxy intermediate enables the site-selective glycosylation of hydroxyketones at the ketone or the alcohol functionality without the use of protecting groups on the aglycone (see scheme). Site selectivity is controlled by the catalyst structure in hydrosilylation and dehydrogenative silylation reactions with sugar silanes. Bn=benzyl.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/63086/1/anie_200901666_sm_miscellaneous_information.pd

Inversion processes for the formation of equatorial glycosides.

Inversion processes for the formation of equatorial glycosides

In Situ Formation of <i>N</i>-Trifluoroacetoxy Succinimide (TFA-NHS): One-Pot Formation of Succinimidyl Esters, <i>N</i>-Trifluoroacetyl Amino Acid Succinimidyl Esters, and <i>N</i>-Maleoyl Amino Acid Succinimidyl Esters

A method for the in situ formation of <i>N</i>-trifluoroacetoxy succinimide (TFA-NHS) and its application in the formation of succinimidyl esters is presented. The developed method provides <i>N</i>-trifluoroacetyl and <i>N</i>-maleoyl amino acid succinimidyl esters from a variety of amino acids using a one-pot, high-yielding protocol. Investigations into the formation of an <i>N</i>-maleoyl amino acid succinimidyl ester supported the proposal of a revised reaction mechanism, and contributed to the optimization of the reaction conditions

Sulphide-nitride inhibition variant with AlN, MnS precipitates and Cu-Co-precipitates with MnS in Fe-3% Si steels

Translated from Russian (Kovove Mater. 1999 (5) 331-348)Available from British Library Document Supply Centre-DSC:9023.190(9740)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo

Transformation of Amorphous Terbium Metal–Organic Framework on Terbium Oxide TbO_x(111) Thin Film on Pt(111) Substrate: Structure of Tb_xO_y Film

The present study is focused on the synthesis and structural properties of amorphous terbium metal–organic framework thin film (TbMOF-TF) and its transformation to terbium oxide by pyrolysis at 450 °C in the air. The crystalline (cTbMOF) and amorphous (aTbMOF) films were prepared by solvothermal synthesis using different amounts (0.4 and 0.7 mmol) of the modulator (sodium acetate), respectively. The powders were characterized by differential scanning calorimetry (DSC), thermogravimetry (TG), Fourier transform infrared (FTIR), Raman spectroscopy, and scanning electron microscopy (SEM). The varied chemical composition of the surface of TbMOFs and TbxOy was investigated by X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed that aTbMOF had been fully transformed to a Tb4O7 phase with a cubic crystal structure at 450 °C. The amorphous aTbMOF-TF film was prepared by dropping a colloidal solution of amorphous precursor nanocrystals on the SiO2/Si substrates covered with Pt as an interlayer. XPS confirmed the presence of Tb in two states, Tb3+ and Tb4+. The amorphous film has a rough, porous microstructure and is composed of large clusters of worm-like particles, while terbium oxide film consists of fine crystallites of cubic fluorite cF-TbOx, c-Tb4O7, and c-Tb2O3 phases. The surface topography was investigated by a combination of confocal (CM) and atomic force microscopy (AFM). The amorphous film is porous and rough, which is contrast to the crystalline terbium oxide film