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57996-21-1

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57996-21-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57996-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,9,9 and 6 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 57996-21:
(7*5)+(6*7)+(5*9)+(4*9)+(3*6)+(2*2)+(1*1)=181
181 % 10 = 1
So 57996-21-1 is a valid CAS Registry Number.

57996-21-1Downstream Products

57996-21-1Relevant articles and documents

Synthesis and antibacterial activity of racemic paecilocin A and its derivatives against methicillin-sensitive and -resistant Staphylococcus aureus

Ibraheem, Walaa,Wils, Quentin,Camiade, Emilie,Ahmed, Elhadi,Thibonnet, Jér?me,Thiery, Emilie,Petrignet, Julien

, (2021/02/20)

A total synthesis in four steps of racemic paecilocin A, a natural marine phthalide is reported. The synthetic pathway includes an iodine-magnesium exchange followed by a condensation on an aldehyde and represents a sufficiently flexible approach to allow the synthesis of twelve analogs. The synthesized compounds were investigated for their antibacterial activity against methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant strain (MRSA). Three analogs were found to have similar or better antibacterial activity than the natural compound on MRSA.

Directed ortho-metalation of unprotected benzoic acids. Methodology and regioselective synthesis of useful contiguously 3- and 6-substituted 2-methoxybenzoic acid building blocks

Nguyen, Thi-Huu,Castanet, Anne-Sophie,Mortier, Jacques

, p. 765 - 768 (2007/10/03)

By treatment with s-BuLi/TMEDA at -78 °C, unprotected 2-methoxybenzoic acid is deprotonated exclusively in the position ortho to the carboxylate. A reversal of regioselectivity is observed when the acid is treated with n-BuLi/t-BuOK. These results are of general utility for the one-pot preparation of a variety of very simple 3- and 6-substituted 2-methoxybenzoic acids that are not easily accessible by conventional means. The potential usefulness of the method is demonstrated by the expedient synthesis of lunularic acid.

Synthesis of 3-Arylphthalides via Diels-Alder Reactions of Cyclohexa-1,3-dienes with Ethyl 4-Aryl-4-hydroxybut-2-ynoates

Harland, Philip A.,Hodge, Philip

, p. 419 - 421 (2007/10/02)

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