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260260-98-8

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260260-98-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 260260-98-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,0,2,6 and 0 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 260260-98:
(8*2)+(7*6)+(6*0)+(5*2)+(4*6)+(3*0)+(2*9)+(1*8)=118
118 % 10 = 8
So 260260-98-8 is a valid CAS Registry Number.

260260-98-8Relevant articles and documents

Lipase-catalyzed Kinetic Resolution of (+/-)-trans- and cis-2-Azidocycloalkanols

Ami, Ei'ichi,Ohrui, Hiroshi

, p. 2150 - 2156 (2007/10/03)

The lipase-catalyzed kinetic resolution of trans- and cis-2-azidocycloalkanols and the preparation of enantiomerically pure trans- and cis-2-aminocycloalkanols are described. Four kinds of lipases were screened for the acetylation of trans- and cis-2-azidocycloalkanols. Among them, Pseudomonas sp. lipases (lipase PS and lipase AK, Amamo Pharmaceutical Co.) showed the highest enantioselectivity. These products were converted to the corresponding 2-aminocycloalkanols to determine their enantiomeric excess (ee) and absolute configurations by HPLC and CD analyses, using (S)-TBMB carboxylic acid [(S)-2-tert-butyl-2-methyl-1,3-benzodioxole-4-carboxylic acid] as the chiral conversion reagent. The results of the CD analysis proved N,O-bis-(S)-TBMB carboxylated cis-2-aminocycloalkanols to adopt a predominantly N-equatorial conformation. The partially resolved trans- and cis-2-aminocycloalkanols, except for trans-2-aminocyclopentanol, were recrystallized from ethyl acetate to give enantiomerically pure forms.

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