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The paper introduces the increasing applications of cyclotrons in the field of health care and some major work carried out abroad. Its emphasis is placed on the introduction to the application status and the development process of medical cyclotrons in China. The paper has assessed possible developing trends of medical cyclotrons based on the current application demand and the technological development status.
相似文献2.
总结了我们课题组应用膦亚胺叶立德的氮杂Wittig反应合成氮杂环的研究工作.我们发展了一种应用α-酯基膦亚胺与异氰酸酯(或二硫化碳)、亲核试剂的连续成环反应,合成咪唑啉酮及唑类杂环的新方法.应用β-酯基膦亚胺与异氰酸酯(或二硫化碳)、亲核试剂的连续成环反应,则可制备(稠合的)喹唑啉酮和嘧啶酮类杂环.而应用β-炔基膦亚胺与异氰酸酯、亲核试剂在银离子催化下的连续成环反应,可得到吲哚类杂环.最近我们课题组又初步将膦亚胺叶立德应用于串联的Ugi和Passerini后修饰反应中,合成了多取代苯并嗪和喹唑啉类杂环化合物. 相似文献
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