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(E)-1-Chloro-1-buten-3-yne is a halogenated alkyne with the molecular formula C4H5Cl. It is an organic compound characterized by a triple bond between the first and third carbon atoms, a double bond between the first and second carbon atoms, and a chlorine atom attached to the first carbon atom. This molecule exhibits a trans (E) configuration, indicating that the chlorine atom and the triple bond are on opposite sides of the double bond. It is a colorless liquid with a pungent odor and is used as an intermediate in the synthesis of various organic compounds, particularly in the pharmaceutical and chemical industries. Due to its reactivity, it should be handled with care and stored under appropriate conditions to prevent decomposition or hazardous reactions.

20374-91-8

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20374-91-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20374-91-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,3,7 and 4 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20374-91:
(7*2)+(6*0)+(5*3)+(4*7)+(3*4)+(2*9)+(1*1)=88
88 % 10 = 8
So 20374-91-8 is a valid CAS Registry Number.

20374-91-8Downstream Products

20374-91-8Relevant academic research and scientific papers

Alkine und Cumulene, XV. Ueber die Photodimerisierung konjugierter Enine

Eisenhuth, Ludwig,Siegel, Herbert,Hopf, Henning

, p. 3772 - 3788 (2007/10/02)

On irradiation in the presence of triplet sensitizers having a triplet energy >250 KJ/mol, vinylacetylene (1a) dimerizes to cis- and trans-1,2-diethynylcyclobutane (cis- and trans-2) as well as minor amounts of 4-ethynyl-1-vinylcyclobutene (3).The effect of substituents on the course of the reaction is investigated: whereas alkyl, vinyl, and phenyl substituents, respectively, in the 4-position of 1a do not influence the photoaddition, 2-substituted enynes yield the corresponding cyclobutanes in poor yields only.Finally, 1-substituted vinylacetylenes (besides the substituents mentioned above the influence of ethynyl, chloro, and methoxy groups has been investigated) do not provide photodimers; they are cis-trans-isomerized instead.The mechanism of the photoaddition is discussed.

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