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Azulene, 1-[(1Z)-2-phenylethenyl]-, also known as 1-(2-phenylethenyl)azulene, is an organic compound with a molecular formula of C17H14. It is a derivative of azulene, a naturally occurring tricyclic aromatic hydrocarbon, and features a phenylethenyl group attached to the azulene core. Azulene, 1-[(1Z)-2-phenylethenyl]- is characterized by its unique structure, which consists of a seven-membered ring fused to a five-membered ring, with the phenylethenyl group attached to the seven-membered ring. Azulene, 1-[(1Z)-2-phenylethenyl]-, is of interest in the field of organic chemistry and may have potential applications in the synthesis of various compounds due to its distinct structure and properties.

840-16-4

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840-16-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 840-16-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,4 and 0 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 840-16:
(5*8)+(4*4)+(3*0)+(2*1)+(1*6)=64
64 % 10 = 4
So 840-16-4 is a valid CAS Registry Number.

840-16-4Relevant academic research and scientific papers

Photochemical Cis to Trans One-Way Isomerization of Styrylazulenes on Their Triplet Excited State. Examination of Ethylenes with Non-Benzenoid Substituents of Low Triplet Energies

Karatsu, Takashi,Kitamura, Akihide,Arai, Tatsuo,Sakuragi, Hirochika,Tokumaru, Katsumi

, p. 1674 - 1679 (1994)

1-Styrylazulene and 7-isopropyl-1,4-dimethyl-3-styrylazulene (3-styrylguaiazulene) underwent one-way isomerization from the cis to the trans isomer on triplet sensitization.Their triplet states as intermediates of the isomerization were observed by laser flash photolysis.However, their excitation to either the lowest excited single state (S1) or the second excited singlet state (S2) by direct irradiation afforded photostationary mixtures comprising 98percent of the trans and 2percent the cis isomers, which implies the participation of a singlet isomerization path.

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