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54912-92-4

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54912-92-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 54912-92-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,9,1 and 2 respectively; the second part has 2 digits, 9 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 54912-92:
(7*5)+(6*4)+(5*9)+(4*1)+(3*2)+(2*9)+(1*2)=134
134 % 10 = 4
So 54912-92-4 is a valid CAS Registry Number.

54912-92-4Relevant articles and documents

Preparation and C-Alkylation of Enantiomerically Pure S-Phenyl Aziridenecarbothioates. On the Structure of Small-Ring Ester Lithium Enolates

Haener, Robert,Olano, Bernardo,Seebach, Dieter

, p. 1676 - 1693 (2007/10/02)

Racemic and enantiomerically pure methyl N-(tert-butyl)-N-benzyl- and N-1-(phenylethyl)aziridinecarboxylates are prepared by known methods and converted to phenyl thioesters (1, 2, 15, 16; Schemes 2 and 3).These are deprotonated with lithium diisopropylamide (LDA) and BuLi (for removal of diisopropylamine) in THF at dry-ice temperature.The resulting lithiated species are surprizingly stable and deuterated, alkylated (CH3, C2H5, allyl, benzyl), and added to aldehydes and nitroolefins in good yields (50-80 percent, 18 examples; Schemes 1 and 4-6).The configurational stability of the lithiated species is studied, and conclusions about their structures are drown.Thus, a C(α)-lithiated ester (see L, Scheme 9) or an O-liithia1ed "enolate" (see M) with pyramidalized C(β)-atom is proposed for species from levorotatory S-phenyl N-benzylaziridinecarbothioate which does not undergo racemization after 1 h at -60 deg C (THF solution).

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