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82757-18-4

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82757-18-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 82757-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,7,5 and 7 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 82757-18:
(7*8)+(6*2)+(5*7)+(4*5)+(3*7)+(2*1)+(1*8)=154
154 % 10 = 4
So 82757-18-4 is a valid CAS Registry Number.

82757-18-4Relevant articles and documents

Two New Oxindole Syntheses

Fleming, Ian,Loreto, Maria Antonietta,Wallace, Ian H.M.,Michael, Joseph P.

, p. 349 - 360 (2007/10/02)

Two oxindole syntheses are described, both starting from ketones, in which the carbonyl carbon becomes C-3 of the oxindole.The first route uses o-lithioformanilide followed by attack with cyanide ion and hydrolysis.The second uses a pinacol-type rearragement (or the γ-silyl alcohol variation) to create the quaternary centre, and involves an intramolecular displacement of fluoride ion from an unactivated benzene ring by an amide nitrogen to complete the lactam ring.The two routes are stereochemically complementary, giving different spiro-oxindoles from norbornanone.

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