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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 17, Number 6
JKCSEZ 17(6)
December 20, 1973

Title	Nucleophilic Displacement at Sulfur Center (Ⅲ). Kinetic Studies on Halide Exchange Reactions of Dimethylsulfamoyl Chloride in Dry Acetone 유황의 친핵 치환반응 (제3보). 아세톤 용매속에서의 Dimethylsulfamoyl Chloride의 할라이드 교환반응에 관한 속도론적 연구
Author	Ikchoon Lee, Shi Choon Kim 이익춘, 김시준
Keywords
Abstract	Dimethylsulfamoyl chloride의 할라이드 교환반응을 무수 아세톤 용매속에서 방사성 할라이드 이온을 사용하여 두 온도에서 속도론적으로 연구하였다. 그 결과를 benzensulfonyl chloride의 경우와 비교해 보면 친핵성에 있어서는 거의 비슷한 경향성을 나타내나, 반응속도는 dimethylsulfamoyl chloride 쪽이 10-2qo 이상이나 느린 경향을 나타낸다. 또한 활성화 파라미터, ΔH≠나 ΔS≠는 benzensulfonyl chloride의 경우와는 반대로 dimethylsulfamoyl chloride의 경우는 Cl- > Br- > I-의 순서로 감소함을 나타낸다. 이 결과를 bond-breaking, bond formation, electronic requirment 및 HSAB 원리로 설명하였다. Kinetic study of halide exchange for dimethylsulfamoyl chloride in dry acetone by using radioisotopic halide ions has been carried out at two temperatures. The result of the order of nucleophilicity, as compared with benzenesulfonyl chloride, shows a similar tendency but reaction rate is slower, more than 10-2 times, than benzenesulfonyl chloride. The activation parameter, ΔH≠ and ΔS≠ decrease in sequence Cl- > Br- > I- in dimethylsulfamoyl chloride but it is the reverse order found for benzenesulfonyl chloride. The results are interpreted with bond-breaking, bond-formation, and electronic requirments, and in the light of HSAB Principle.
Page	406 - 410
Full Text	PDF

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