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212912-54-4

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212912-54-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 212912-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,2,9,1 and 2 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 212912-54:
(8*2)+(7*1)+(6*2)+(5*9)+(4*1)+(3*2)+(2*5)+(1*4)=104
104 % 10 = 4
So 212912-54-4 is a valid CAS Registry Number.

212912-54-4Downstream Products

212912-54-4Relevant articles and documents

Highly efficient asymmetric access to 1-azaspiro[4.4]nonane skeleton

Planas, Lo?c,Pérard-Viret, Jo?lle,Royer, Jacques,Selkti, Mohamed,Thomas, Alain

, p. 1629 - 1632 (2007/10/03)

Vinylogous Mukaiyama aldol type reaction of chiral non-racemic silyloxypyrroles followed by acidic treatment affords an efficient asymmetric access to 1-azaspiro[4.4]nonanes in high diastereoisomeric excess (up to 79%).

A new asymmetric approach towards 2-pyrrolidinones and pyrrolidines: Simple versus double stereodifferentiation

Poli, Giovanni,Ciofi, Simone,Maccagni, Elisa,Sardone, Nicola

, p. 8669 - 8672 (2007/10/02)

The condensation of a chiral 2-silyloxypyrrole derivative with achiral and chiral formyl cation equivalents has been studied for the first time. The methodology allows to build-up pyroglutammic aldehydes and prolinal systems with a stereocontrol from good to excellent. Whereas the chiral auxiliary residing on the pyrrole system shows an intrinsic good level of diastereoface discrimination at C-5, the combined use of a 2-methoxy-3-tosyl-oxazolidine as a chiral formylating agent allows a total stereocontrol of the condensation. A rationale for the observed stereochemical outcome is presented.

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