氯碘化物

And to make the product be easy of purification, the excess of amine was reduced to 50% from 150%. Then the diiodoalkane reacted with dialkylmethylamine into diquaternary ammonium iodide, and obtained three diquaternary compounds whose spacer groups were -(CH2)6-, N,N"-dimethyl- N,N,N",N"-tetraoctyl-1,6-hexane diammonium diiodide, N,N"-dimethyl-N,N,N",N"-tetradecyl-1,6-hexane diammonium diiodide, N,N"-dimethyl-N,N,N",N-tetradodecyl -1,6-hexane diammonium diiodide.

对于更长间隔链的双子型季铵盐，一方面为了加快亲核取代反应速率，先将1，6-二氯己烷、3-氧杂-1，5-二氯戊烷转化成1，6-二碘己烷、3-氧杂-1，5-二碘戊烷，另一方面为了降低产物提纯的难度，将叔胺的过量由150%降到50%，使二碘代烷与双长烷基甲基叔胺在相同的温度下、反应相同的时间，经过相同的后处理，得到3个间隔链为-(CH2)6-的双子型季铵碘化物，(C8H17)2N+(CH3)(CH2)6 (CH3)N+(C8H17)2·2I-、(C10H21)2N+(CH3)(CH2)6(CH3)N+(C10H21)2·2I-和(C12H25)2N+(CH3)(CH2)6(CH3)N+(C12H25)2·2I-。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。