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133981-12-1

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133981-12-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133981-12-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,9,8 and 1 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 133981-12:
(8*1)+(7*3)+(6*3)+(5*9)+(4*8)+(3*1)+(2*1)+(1*2)=131
131 % 10 = 1
So 133981-12-1 is a valid CAS Registry Number.

133981-12-1Relevant articles and documents

A new approach to the synthesis of enantiomerically pure 2,3-diaminoacids through chiral imidazolidin-2-ones

Cardillo, Giuliana,Orena, Mario,Penna, Maurizio,Sandri, Sergio,Tomasini, Claudia

, p. 2263 - 2272 (2007/10/02)

The synthesis of enantiomerically pure 5-iodomethylimidazolidin-2-ones (3a-c) and (4a-c) is reported, by means of iodocyclisation of allylic tosylureas (2a-c). Starting from pure (3a) and (4a), a synthesis of both (R)- and (S)-2,3-diaminopropanoic acid is

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