Low molecular weight materials contained in PPS resin were obtained by extracting PPS powder exhaustively with xylene and examined by solid probe mass spectroscopy.Six families of oligomers have been identified in the...Low molecular weight materials contained in PPS resin were obtained by extracting PPS powder exhaustively with xylene and examined by solid probe mass spectroscopy.Six families of oligomers have been identified in the extract. Cyclopenta (p-phenylenesulfide) (Ⅰ) and Cyclohexa (p-phenylene sulfide)(Ⅱ)have been isolated from PPS by extraction and recrystallization, and characterized.展开更多
Reaction of 6-deoxy-6-(N-imidazolyl)-β-cyclodextrin 2 with α, α'-dibromoxylene afforded cyclodextrin dimer 3 with two imidazolium residues as catalytic site and two cyclodextrin cavities as binding site.
A new type of cyclodextrin dimers (2a-c) bridged with multidentate coordination units has been synthesized by treatment of 6-deoxy-6-hydroxyethylamino-beta-cyclodextrin 1 with corresponding dibromides in the presence ...A new type of cyclodextrin dimers (2a-c) bridged with multidentate coordination units has been synthesized by treatment of 6-deoxy-6-hydroxyethylamino-beta-cyclodextrin 1 with corresponding dibromides in the presence of base.展开更多
文摘Low molecular weight materials contained in PPS resin were obtained by extracting PPS powder exhaustively with xylene and examined by solid probe mass spectroscopy.Six families of oligomers have been identified in the extract. Cyclopenta (p-phenylenesulfide) (Ⅰ) and Cyclohexa (p-phenylene sulfide)(Ⅱ)have been isolated from PPS by extraction and recrystallization, and characterized.
文摘Reaction of 6-deoxy-6-(N-imidazolyl)-β-cyclodextrin 2 with α, α'-dibromoxylene afforded cyclodextrin dimer 3 with two imidazolium residues as catalytic site and two cyclodextrin cavities as binding site.
文摘A new type of cyclodextrin dimers (2a-c) bridged with multidentate coordination units has been synthesized by treatment of 6-deoxy-6-hydroxyethylamino-beta-cyclodextrin 1 with corresponding dibromides in the presence of base.
