• 제목/요약/키워드: N,N-Dimethylformamide

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메탄올, N, N-Dimethylformamide 및 Acetonitrile 속에서 2염기성 카르복시산의 해리상수 (Dissociation Constants of Dibasic Carboxylic Acids in Methanol, N, N-Dimethylformamide and Acetonitrile)

  • 문수찬
    • 대한화학회지
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    • 제16권6호
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    • pp.369-372
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    • 1972
  • 메탄올, N, N-dimethylformamide 및 acetonitrile속에서 이염기성 카르복시산 $(HOOC(CH_2)_nCOOH$, n=0∼4)의 해리상수를 유리전극을 사용하여 전위차법으로 측정했다. 두 용매간에서 각 산의 전해리상수의 차는 거의 일정한 값이 되며, 이 값은 일염기성 카르복시산의 해리상수의 차와 거의 일치했다. 그리고 $K_1/K_2$의 값은 양성자성용매인 물과 메탄올에서보다 반양성자성용매인 N,N-dimethylformamide와 acetonitrile에서 훨씬 더 크다.

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N, N-dimethylformamide 취급근로자의 유해위험 정보 인식도 조사 (A study on chemical hazard communication for workers exposed to N, N-dimethylformamide)

  • 양정선;임철홍;이혜진
    • 한국산업보건학회지
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    • 제21권2호
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    • pp.103-109
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    • 2011
  • Object: we investigated some factors which can affect workers' comprehension of chemical hazard information and their actions to protect themselves from the hazard. Method: Comprehension score of chemical hazard information and the rate of wearing personal protective equipment (PPE) was surveyed for the 109 workers from 15 factories who were exposed to N, N-dimethylformamide. Difference of the worker's comprehension score of hazard information was analyzed by education interval, work duration and the way of occupational safety and health management between self-managed or sub-contracted. Result: Mean comprehension score of N, N-dimethylformamide hazard, which was given as a short quiz composed of 10 "true" or "false" problems, was 65%. Mean percentage of wearing PPE was improved as the education program was done within a month but decreased after 6 months. Eighty seven % of workers got the chemical hazard information from the material safety data sheet placed at workplace. Conclusion: Education interval and comprehension score affected the rate of wearing PPE. The way of occupational safety and health management self-managed or sub-contracted did not affect the workers' comprehension score on hazard information nor the rate of wearing PPE.

디메틸포름아미드 디알킬 아세탈을 이용한 우레아 유도체의 합성 (Synthesis of N,N-Dimethylurea Derivative By Use of Dimethylformamide Dialkyl Acetals)

  • 홍순영
    • 대한화학회지
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    • 제26권6호
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    • pp.403-406
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    • 1982
  • N, N-디메틸포름아미드 디알킬 아세탈류를 N-아실-1,4-디메톡시-2-나프틸아민의 몇 가지에 반응시켰더니 어느 경우에나 동일한 생성물인 N,N-디메틸-N'-2-(1,4-디메톡시)나프틸우레아 만이 생성 되었다. 이들 반응으로부터 N,N-디메틸포름아미드 디알킬아세탈은 반응 상대화합물에 전자밀도가 낮은 원자가 있을 때는 친핵 공격으로 반응하는 디메틸아미노화 시약으로 작용한다는 사실을 발견 하였다.

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Novel aspects of bromolactonization reaction using N-haloimides in an aprotic polar solvent

  • Jew, Sang-Sup
    • Archives of Pharmacal Research
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    • 제5권2호
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    • pp.97-101
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    • 1982
  • Depending upon the results obtained by the bromolactonization of olefinic acids (9-11) by means of N-bromosaccharin (4), the influence of the stabilities of the imidic anions resulted from heterolytic cleavage of N-haloimides, such as N-bromosuccinimide (1), N-bromophthalimde (2), and N-bromosaccharin (3) in dry N, N-dimethylformamide on the reactivity is elucidated.

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N,N-Dimethylformamide 용매 중에서 Biliverdin의 전기화학적 거동 (Electrochemical Behaviors of Biliverdin in N,N-Dimethylformamide)

  • 배준웅;이흥락;박태명
    • 대한화학회지
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    • 제37권8호
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    • pp.730-734
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    • 1993
  • 비양성자성 용매인 N,N-dimethylformamide(DMF) 중에서 Biliverdin(BV)의 전기화학적인 환원거동을 직류폴라로그래프법, 순환전압전류법 및 정전위 전기량법으로 조사하였다. 또한 BV의 최종 환원생성물을 UV-Vis spectroscopy로 조사하였다. DMF 용매 중에서 BV는 -0.71 V vs. Ag/Ag$^+$와 -0.91 V vs. Ag/Ag$^+$ 에서 2개의 환원파를 보였다. 각 환원파의 전류유형은 제 1환원파는 확산지배적인 전류였으며, 제 2환원파는 반응성 전류가 약간 포함된 확산전류이었다. 그리고 제 1단계의 환원과정은 비가역적이었다. 각 환원단계에 관여하는 전자수는 1개씩 이었으며, BV은 DMF 용액 중에서 1전자 2단계의 환원과정을 거쳐서 Bilirubin으로 환원되었다.

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水素結合 이합체에 關한 理論的인 硏究, 메탄올-溶妹 이성분계에 대한 水素結合 에너지의 AM1 的 硏究 (Theoretical Studies of Hydrogen Bonded Dimers AM1 Study of Hydrogen-Bonding Energies of MeOH-solvent Binary Systems)

  • 김시준;박명옥
    • 대한화학회지
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    • 제32권3호
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    • pp.249-259
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    • 1988
  • Methanol, ethanol, acetone, dimethylsulfoxide, N,N-dimethylformamide, tetrahydrofuran, dioxane, 및 acetonitrile의 8가지 분자에 대한 용매효과를 고찰할 목적으로 메탄올을 양성자로 하고, 8가지 분자를 양성자 받게로 하여, 이들 이합체를 AM1 Hamiltonian법과 supermolecule법에 의해 monomer 및 dimer의 optimized geometry, electron density, molecular energy 및 hydrogen-bonding energy를 계산하였다. 그 결과로 각 dimer의 hydrogen-bonding에 기여하는 stabilization energy 순서는 dimethylsulfoxide > ethanol > N,N-dimethylformamide > acetone > methanol > tatrahydrofuran > dioxane > acetonitrile임을 알았으며 이 안정성의 순서를 electron density의 변화 및 energy partition의 결과로 설명하였다.

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Methanol, N,N-dimethylformamide 및 Acetonitrile 속에서 유리전극의 pH 응답성 (The Response Characteristic of Hydrogen-responsive Glass Electrode in Methanol, N, N-dimethylformamide and Acetonitrile)

  • 문수찬
    • 대한화학회지
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    • 제16권3호
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    • pp.149-156
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    • 1972
  • 메타놀, N,N-디메칠포름아미드 및 아세토니트릴 속에서 유리전극의 pH 응답성을 여러가지 pH의 완충용액으로 시험한 바 전극을 물속에 보관하는 것보다 측정하고저 하는 용매속에 보관하는 것이 더 빨리 전위가 안정되었다. 같은 용매에서 용액의 염기성에 비례하여 응답속도가 느리고 강염기성 용액에서는 안정한 전위를 얻기 어려웠다. 산성용액에서의 pH 응답성은 보다 빠르나 같은 용액의 pH 측정에서도 전극의 사용한 이력에 따라 응답성과 측정치에 차이가 생겼다.

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A novel bromolactonization reaction using racemic 2-bromo-5-isobutyl-5-methylhydantoin

  • Cho, Youn-Sang;Jew, Sang-Sup;Chung, You-sup
    • Archives of Pharmacal Research
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    • 제5권2호
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    • pp.93-96
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    • 1982
  • By using recemic 3-bromo-5-isobutyl-5-methylhydantoin (3a') in dry N, N-dimethylformamide which is a model reagent for asymmetric bromolactonization, bromolactonization of a series of olefinic acids was carried out to furnish corresponding bromolactones in moderate yields.

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흡착-열탈착-GC/MS를 이용한 환경대기 중 N,N-Dimethylformamide 농도 측정 (Determination of N,N-Dimethylformamide in Ambient Air Using Adsorption Sampling and Thermal Desorption with GC/MS Analysis)

  • 서영교;황윤정;이순진;이민도;한진석;백성옥
    • 한국대기환경학회지
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    • 제26권4호
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    • pp.357-366
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    • 2010
  • The purpose of this study is to evaluate a method for the measurement of N,N-Dimethylformamide (DMF) and to apply the method to the ambient air samples. For the determination of DMF together with other general VOCs (e.g., benzene, toluene, and xylenes), adsorption sampling and thermal desorption with GC/MS was used in this study. The sampling and analytical approaches tested in this study showed a good repeatability and linearity with lower detection limits of less than 0.35 ppb. Field measurements were carried out at three industrial sites (Daegu-Seongseo, Siwha and Banwall industrial complexes) and one residential site in Daegu city during a period from October 2006 to November 2008. DMF was detected in 71.8% of the total samples from the Seongseo industrial complex, well known for textile industry. In contrast, DMF was detected in only 20.4% and 12.9% of all the samples from the other two sites in Banwall and Siwha industrial complexes, respectively. This implies that sources of DMF should be strongly associated with textile industry. The mean concentration of DMF also appeared to be the highest in Seongseo site (5.95 ppb), followed by a residential site in Daegu (3.28 ppb), Banwall (0.88 ppb) and Siwha (0.55 ppb). In this study, we demonstrated the environmental significance of DMF in urban ambient air. To our knowledge, the DMF measurement introduced in this paper is the first case of an official report in Korea.