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21997-97-7

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21997-97-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21997-97-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,9 and 7 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21997-97:
(7*2)+(6*1)+(5*9)+(4*9)+(3*7)+(2*9)+(1*7)=147
147 % 10 = 7
So 21997-97-7 is a valid CAS Registry Number.

21997-97-7Relevant articles and documents

Efficient synthesis of tetrahydro-b-carbolin-1-one and dihydroisoquinolin- 1-one derivatives as versatile Intermediates

Judd, Katie E.,Mahon, Mary F.,Caggiano, Lorenzo

experimental part, p. 2809 - 2817 (2010/01/21)

An efficient one-pot procedure is described in which an isocyanate intermediate, generated from the corresponding carboxylic acid by a modified Curtius rearrangement, is captured by a tethered aromatic ring in the presence of BF3?OEt2 to generate various

AN ENANTIOSELECTIVE SYNTHESIS OF 1-(α-HYDROXYALKYL)-1,2,3,4-TETRAHYDROISOQUINOLINES THROUGH OPTICALLY ACTIVE N-OXAACYLIMINIUM ION INTERMEDIATES

Kano, Shinzo,Yuasa, Yoko,Shibuya, Shiroshi

, p. 395 - 398 (2007/10/02)

An enantioselective synthesis of 1S-(1'S-hydroxyethyl)- 1S-(1'S-hydroxybenzyl)- and 1R-(1'R-hydroxybenzyl)-1,2,3,4-tetrahydroisoquinoline was achieved by reductive cleavage of the oxazolidinone ring of the correspponding 1-substituted oxazoloisoqui

A cyclization of β-arylethylisocyanates to 3,4-dihydroisocarbostyrils

Umezawa,Hoshino,Sawaki,Mori

, p. 1003 - 1005 (2007/10/02)

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