카르보닐 탄소원자의 친핵치환 반응 (제5보). 아세톤 용매속에서의 Dialkylcarbamoyl Chloride의 할로겐 교환반응에 관한 속도론적 연구

Nucleophilic Substitution at a Carbonyl Carbon Atom (V). Kinetic Studies on Halogen Exchange Reactions of N,N-Dialkylcarbamoyl Chlorides in Dry Acetone

  • 김시준 (한양대학교 교양학부 화학과) ;
  • 이익춘 (인하대학교 이과대학 화학과)
  • Kim Shi Choon (Department of Chemistry, College of General Studies, Hanyang University) ;
  • Lee, Ik Choon (Department of Chemistry, Inha University)
  • 발행 : 1975.02.28

초록

Carbonyl 탄소원자의 반응성에 대한 연구의 일환으로 N,N-dimehtylcarbamoyl chloride와 N,N-diethylcarbamoyl chloride의 할로겐 교환반응을 아세톤 용매속에서 방사성 할라이드 이온을 사용하여 두 온도에서 속도론적으로 연구하였다. 그 결과를 alkylchloroformate의 경우와 비교하면, 친핵성의 순서는 비슷한 경향을 나타내나, 반응속도는 가용매분해나 alkylchloroformate의 경우보다 느리다. 활성화 피라미터 ${\Delta}H^*$${\Delta}S^*$$Cl^{\rightarrow}Br^{\rightarrow}I^-$는순서로 감소한다. 이 결과를 용매화 효과, bond-breaking, bond-formation 및 electronic requirment로 설명하였다.

Kinetic study of halogen exchange for N,N-dimethylcarbamoyl chloride and N,N-diethylcarbamoyl chloride in acetone by using radioisotopic halide ions has been carried out at two temperatures as a part of studying the reactivity of carbonyl carbon atom. The order of nucleophilicity showed a similar tendency as that for alkyl chloroformate, but reaction rate is much slower than that for solvolysis and alkyl chloroformate. The activation parameters,${\Delta}H^*$and${\Delta}S^*$ were found to decrease in sequence $Cl^{\rightarrow}Br^{\rightarrow}I^-$ for N,N-dialkylcarbamoyl chlorides. The results are interpreted in terms of solvation effect, degree of bond-breaking and bond-formation and electronic requirements.

키워드

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