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91881-19-5

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91881-19-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91881-19-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,8,8 and 1 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 91881-19:
(7*9)+(6*1)+(5*8)+(4*8)+(3*1)+(2*1)+(1*9)=155
155 % 10 = 5
So 91881-19-5 is a valid CAS Registry Number.

91881-19-5Relevant articles and documents

Total synthesis of (±)-clavizepine

Ishibashi, Hiroyuki,Takagaki, Kazutaka,Imada, Noriko,Ikeda, Masazumi

, p. 10215 - 10224 (2007/10/02)

The first total synthesis of benzopyranobenzazepine alkaloid (±)- clavizepine (1) has been achieved by using the Bradsher cyclization of the keto ester 16 (leading to 18) and the Pummerer-type cyclization of the sulfoxide 25 (leading to 26) as the key ste

BENZOPHENANTHRIDINES V. INVESTIGATION OF THE RODIONOV-SUVOROV SCHEME. SYNTHESIS OF 3,3-DIETHOXYCARBONYL-2-(3,4-DIMETHOXYPHENYL)-6,7-DIMETHOXY-1-TETRALONE

Kyong, Dao Hung,Sladkov, V. I.,Suvorov, N. N.

, p. 1732 - 1738 (2007/10/02)

Triethyl 1,3-bis(3,4-dimethoxyphenyl)propane-1,2,2-tricarboxylate was synthesized by the alkylation of the lithium enolate of ethyl homoveratrate with α-bromo(3,4-dimethoxybenzyl)malonic ester.It was converted by intramolecular acylation, catalyzed by BF3

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