Such a helerocycle is found in pyrylium salts . 吡喃盐就是这类的杂环。
Pyran is not aromatic, but the phrylium ion is . 吡喃不是芳香的,但英嗡离子是。
Treatments of pyrylium salts with various nucleophilic reagents allows the production of a host of functionalized derivatives . 如果各种亲核试剂与吡喃盐反应,就可制取许多种带官能基的衍生物。
Pyran is not aromatic , but the phrylium ion is 吡喃不是芳香的,但??英嗡离子是。
Synthesis and crystal structure of - d - o - acetyl - glycopyranosyl azide 吡喃葡萄糖叠氮化物的合成及晶体结构