Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in com...Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in compound 1 was also described.展开更多
1 Results Polypropylene polyol is very important chemical materials for polyurethane. We developed newly designed polypropylene polyol with terminated primary hydroxyl group. We focus on our new polypropylene polyol, ...1 Results Polypropylene polyol is very important chemical materials for polyurethane. We developed newly designed polypropylene polyol with terminated primary hydroxyl group. We focus on our new polypropylene polyol, and show its useful application for polyurethane foam. Polymerization of propyleneoxide is conventionally carried out in anionic polymerization process. In anionic process α-cleavage of propyleneoxide occurs rather than β-cleavage. Then the terminal hydroxyl group of the resulting polypropy...展开更多
An intermolecular phenolic hydroxy methylation occurring between chiral N,N'-bis(2-hydroxyphenyl)-2,2-di- methyl-1,3-dioxolane-4,5-dicarbamide and co-crystallized methanol under electron impact ionization conditio...An intermolecular phenolic hydroxy methylation occurring between chiral N,N'-bis(2-hydroxyphenyl)-2,2-di- methyl-1,3-dioxolane-4,5-dicarbamide and co-crystallized methanol under electron impact ionization conditions was observed. The result was confirmed by X-ray diffraction structural ananlysis of a co-crystalline of (R,R)-enantiomer and methanol.展开更多
文摘Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in compound 1 was also described.
文摘1 Results Polypropylene polyol is very important chemical materials for polyurethane. We developed newly designed polypropylene polyol with terminated primary hydroxyl group. We focus on our new polypropylene polyol, and show its useful application for polyurethane foam. Polymerization of propyleneoxide is conventionally carried out in anionic polymerization process. In anionic process α-cleavage of propyleneoxide occurs rather than β-cleavage. Then the terminal hydroxyl group of the resulting polypropy...
基金Project supported by the National Natural Science Foundation of China (No. 20272002) Ministry of Education of China (SRF for ROCS and EYTP) and Peking University (Present grant).
文摘An intermolecular phenolic hydroxy methylation occurring between chiral N,N'-bis(2-hydroxyphenyl)-2,2-di- methyl-1,3-dioxolane-4,5-dicarbamide and co-crystallized methanol under electron impact ionization conditions was observed. The result was confirmed by X-ray diffraction structural ananlysis of a co-crystalline of (R,R)-enantiomer and methanol.
