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(2S,6R)-6-((R)-1-Hydroxy-ethyl)-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid methyl ester is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.

74189-21-2

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74189-21-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74189-21-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,8 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 74189-21:
(7*7)+(6*4)+(5*1)+(4*8)+(3*9)+(2*2)+(1*1)=142
142 % 10 = 2
So 74189-21-2 is a valid CAS Registry Number.

74189-21-2Relevant academic research and scientific papers

FROM PENICILLIN TO PENEM AND CARBAPENEM. II. SYNTHESIS OF 3,4-DISUBSTITUTED AZETIDINONE DERIVATIVES FROM 6,6-BIS(PHENYLSELENYL)PENICILLANATE

Hirai, Koichi,Iwano, Yuji,Fujimoto, Katsumi

, p. 4021 - 4024 (2007/10/02)

6,6-Bis(phenylselenyl)penicillanate 2a was converted into 6-1'-(R)-hydroxyethyl substituted penicillanate 5 in high yield.Compound 5 was deselenylated to 10.Oxidation, and then the basic epimerization of cis sulfone 11 gave trans sulfone derivative 12.The trans sulfone 12 was degraded to the monocyclic β-lactams 14, 15 which are important precursors for the carbapenem synthesis.

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