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261911-55-1

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261911-55-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 261911-55-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,1,9,1 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 261911-55:
(8*2)+(7*6)+(6*1)+(5*9)+(4*1)+(3*1)+(2*5)+(1*5)=131
131 % 10 = 1
So 261911-55-1 is a valid CAS Registry Number.

261911-55-1Relevant articles and documents

Synthesis of optically active 5-substituted-2-pyrrolidinone derivatives having atropisomeric structure and 3,5-cis-selective reaction of their enolates with electrophiles

Fujita, Masao,Kitagawa, Osamu,Yamada, Yoichiro,Izawa, Hirotaka,Hasegawa, Hiroshi,Taguchi, Takeo

, p. 1108 - 1114 (2000)

Optically pure forms (≥98% ee) of N-(o-tert-butylphenyl)-5- (methoxymethyl)-2-pyrrolidinone having atropisomerism and N-(o-tert- butyldiphenylsiloxyphenyl)-5-(methoxymethyl)-2-pyrrolidinone having an atropisomerism-like structure were prepared from ortho-substituted aniline derivatives and (S)-5-(methoxymethyl)butyrolactone in a stereoselective manner. The reactions of Li-enolates from these lactams with various electrophiles and subsequent dearylation of the products gave 3,5-cis- disubstituted-2-pyrrolidinone derivatives.

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