科研之友
微信
新浪微博
Facebook
分享链接
摘要
We prepared a series of imidazolium-substituted uracil-anions which are members of the class of cross-conjugated heterocyclic mesomeric betaines. They are in tautomeric equilibrium with their N-heterocyclic carbenes, uracil-6-yl-imidazol-2-ylidenes. These carbenes can be trapped by reaction with sulfur, selenium, as well as by triethylborane and triphenylborane, respectively. The latter trapping reaction yielded the first representatives of a new heterocyclic zwitterionic ring system, imidazo[ 2',1':3,4][1,4,2]diaza-borolo[1,5-c]pyrimidinium-10-ide. Results of two single crystal X-ray structure analyses are presented.
- 出版日期2014
