Ruthenium(III) acetylacetonate [Ru(acac)3] — An efficient chemoselective catalyst for the tetrahydropyranylation (THP) of alcohols and phenols under solvent-free conditions
Polystyrene-supported GaCl3: A new, highly efficient and recyclable heterogeneous Lewis acid catalyst for tetrahydropyranylation of alcohols and phenols
作者:Ali Rahmatpour
DOI:10.1016/j.poly.2012.06.063
日期:2012.8
highly chemoselective method for tetrahydropyranylation of alcohols and phenols with 3,4-dihydro-2H-pyran (DHP) in the presence of polystyrene-supported gallium trichloride (PS/GaCl3) as a highly active and reusable heterogeneous Lewisacidcatalyst at room temperature is presented. In this catalytic system, primary, secondary and tertiary alcohols, as well as phenols, were converted to the corresponding
Direct Glycosylation of Unprotected and Unactivated Carbohydrates under Mild Conditions
作者:Matthias Pfaffe、Rainer Mahrwald
DOI:10.1021/ol203329u
日期:2012.2.3
Ligand exchange acetalization of acetals in the presence of catalytic amounts of mandelic acid and titanium tert-butoxide is reported. This transformation is successfully extended to glycosylation of unprotected and unactivated pentoses. Even unreactive pentoses such as d-arabinose or d-lyxose can be transformed by this new methodology into corresponding isopropyl glycosides.
MONOMER, POLYMER, RESIST COMPOSITION, AND PATTERNING PROCESS
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20150322027A1
公开(公告)日:2015-11-12
A monomer (1) is prepared by reacting a compound (9) with a base or metal to form a metal enolate reagent, and reacting the metal enolate reagent with an acyloxyketone compound (8). A polymer derived from the monomer is used as base resin to formulate a resist composition, which is shelf stable and displays a high dissolution contrast, controlled acid diffusion and low roughness in forming positive pattern via alkaline development and in forming negative pattern via organic solvent development.
Certain methanofullerene derivatives are described, having side chains with acid-labile protecting groups. The methanofullerene derivatives may find application as photoresist materials, and particularly as positive-tone photoresists.
The addition of benzoic acid as a co-catalyst facilitating cooperative Brønsted acid catalysis was found to be valuable for reactions involving phenols and higher substituted alcohols. Mechanistic investigations, including kinetic and 1H NMR binding studies in conjunction with density function theory calculations, are described that collectively support a Brønsted acid mode of catalysis.