Zinc-catalyzed Williamson ether synthesis in the absence of base
摘要:
Zinc powder was found to be a highly efficient catalyst for the synthesis of aromatic ethers using microwave heating in the presence of N,N-dimethylformamide as well as under stirring in an oil-bath using tetrahydrofuran as solvent without any inorganic base. This method can be used for selective mono-, di- or tri-O-alkylations. (C) 2004 Elsevier Ltd. All rights reserved.
A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of −8 to 3 at 25° C. to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
PROCESS FOR THE PREPARATION OF POLYHYDRIC ALCOHOLS
申请人:National Institute of Advanced Industrial Science and Technology
公开号:EP1298115A1
公开(公告)日:2003-04-02
A process for preparing a polyhydric alcohol according to the invention comprises subjecting a polyhydric alcohol compound having protected hydroxy group(s) to microwave irradiation in the presence of basic compound(s) or acid(s) having an acid dissociation exponent (pKa) of -8 to 3 at 25°C to remove the protecting groups of the hydroxy group of the polyhydric alcohol compound. The invention can provide an industrially advantageous process for preparing polyhydric alcohols by readily removing protecting group(s) from protected hydroxy group(s) of polyhydric alcohol compounds.
Arylcyclobutene polymers having improved physical properties, such as elongation, are provided. Compositions and methods for coating such arylcyclobutene polymers are also provided.
Crosslinkable polymeric compositions with diallylamide crosslinking coagents, methods for making the same, and articles made therefrom
申请人:Dow Global Technologies LLC
公开号:US10941278B2
公开(公告)日:2021-03-09
Crosslinkable polymeric compositions comprising an ethylene-based polymer, an organic peroxide, and a crosslinking coagent having at least one N,N-diallylamide functional group. Such crosslinkable polymeric compositions and their crosslinked forms can be employed as polymeric layers in wire and cable applications, such as insulation in power cables.