亚碘化物

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为：多氟烷基碘化物在连二亚硫酸钠的引发下，得到自由基R〓，后者加成到二烯丙基乙酸中的一个—C=C—双键上，然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

Polyfluoroalkyl iodides could react with unsaturated olefin acids in the presence of sodium dithionite by radical addition to give adducts. It was found that these adducts could form polyfluoroalkyl substituted γ or δ-lactones due to intramolecular nucleophilic substitution in the alkali solution.

研究发现：多氟烷基碘化物在连二亚硫酸钠存在下与不饱和烯酸经自由基加成得到的产物，能在碱性条件下进行分子内亲核取代反应形成五元或六元环的含氟内酯类化合物。

Technical characteristics and existing problems of cyanide-free silver plating technology were summarized through the analysis of cyanide-free silver plating systems of thiosulfate,succinimide,iodide,hydantoin,sulfite and others.

通过对硫代硫酸盐、丁二酰亚胺、碘化物、乙内酰脲、亚硫酸盐以及其它无氰镀银体系的分析，总结了当前无氰镀银工艺的技术特点及存在的问题，并阐述了无氰镀银技术的发展历程和研究现状。

Part 3 : determination of chromate, iodide, sulfite, thiocyanate and thiosulfate.

第3部分：铬酸盐、碘化物、亚硫酸盐、硫氰酸盐和硫代硫酸酯的测定

The results show that the crude fat in corn bran is 5.99%, the protein is 4.86%, the crude fiber is 12.45%. The physico-chemical indexes of corn bran oil are as following: d(superscript 20℃ subscript 4℃) 0.9135, IV 112.4gI/l00g, SV 189.1mgKOH/g, unsaponifiable matters 3.75%. The fatty acid composition of corn bran oil is: oleic acid 30.27%, linoleic acid 54.14%, palmic acid 13.68%, stearic acid 1.14%.

结果表明，玉米皮粗脂肪含量为5.99%，粗蛋白质4.86%，粗纤维含量为12.45%；玉米皮油的相对密度0.9135，皂化值189.1mgKOH/g，碘值112.4gI/100g，不皂化物3.75%；玉米皮油脂肪酸组成中，油酸30.27%，亚油酸54.14%，棕榈酸13.68%，硬脂酸1.14%。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。