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57664-47-8

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57664-47-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57664-47-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,6,6 and 4 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 57664-47:
(7*5)+(6*7)+(5*6)+(4*6)+(3*4)+(2*4)+(1*7)=158
158 % 10 = 8
So 57664-47-8 is a valid CAS Registry Number.

57664-47-8Relevant articles and documents

Nickel-Catalyzed Acyl Group Transfer of o-Alkynylphenol Esters Accompanied by C?O Bond Fission for Synthesis of Benzo[b]furan

Doi, Ryohei,Shimizu, Koji,Ikemoto, Yuma,Uchiyama, Masashi,Koshiba, Mikiko,Furukawa, Atsushi,Maenaka, Katsumi,Watanabe, Satoshi,Sato, Yoshihiro

, p. 2086 - 2092 (2021/02/27)

Herein, we report the nickel-catalyzed cascade C?O bond cleavage/cyclization of ortho-alkynylphenyl ester to construct a 3-acylbenzo[b]furan skeleton. As a result of reaction condition screening, the Ni(0)/IAd (1,3-Di(1-adamantyl)imidazole-2-ylidene) system was found to be optimal for catalytic conversion. Interestingly, the reaction exclusively gives 3-acylbenzo[b]furan instead of a decarbonylated product frequently observed in reactions mediated by acyl-nickel species. The catalyst loadings could be reduced to 5–10 mol %. We demonstrated the synthesis of a variety of functionalized 3-acylbenzofuran derivatives. We conducted stoichiometric study of nickel complexes as well as density functional theory (DFT) calculations to support a possible reaction mechanism.

A Convenient Synthesis of 2-Aryl-3-aroylbenzofurans

Durani, N.,Kapil, R. S.

, p. 489 - 490 (2007/10/02)

The rearrangement of 2-(p-hydroxy)phenyl-3-phenylbenzopyrylium chloride (1), catalysed by H2O2/H2SO4, furnishes 2-(p-hydroxy)phenyl-3-benzoylbenzofuran (2) which is methylated to 3, and then subjected to acid catalysed rearrangement to afford 4.The

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