头孢中间体GCLE的研究开发进展 关键词： GCLE; 头孢中间体; 氯化; 闭环[gap=629]Key words： GCLE; cephalosporin intermedfiate; chloridize; ring closure
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ring closure technique 环口关闭术 ; 内环口关闭术
metal oval-ring closure 金属椭圆环密封
O-ring closure 空心金属O型环密封
Pschorr ring closure 浦肖环合成法
Multiple Ring Closure 形成多环终结
ring-closure 关环反应
由于在一边关闭的领带。
Moreover, the olive t imine also can be cycled and concentrated for use after passing through filter mass washing mother solution after ring closure.
橄榄t亚胺经闭环后的滤饼洗涤母液水还可以循环浓缩使用。
Initially, the approach involved a simple ring closure, but this technique failed because the deeper aponeurotic tissues could not be approximated without tension in the repair.
最初是用一种单环闭合，但因深层腱膜组织在修补中不能无张力拉拢而失败。
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