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201730-83-8

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201730-83-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 201730-83-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,7,3 and 0 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 201730-83:
(8*2)+(7*0)+(6*1)+(5*7)+(4*3)+(3*0)+(2*8)+(1*3)=88
88 % 10 = 8
So 201730-83-8 is a valid CAS Registry Number.

201730-83-8Upstream product

201730-83-8Relevant articles and documents

1-(3,4-Dihydro-4-oxoquinazolin-3-yl)aziridines (Q-substituted aziridines): Ring-opening reactions with C-N bond cleavage and preparation of Q-free chirons

Atkinson, Robert S.,Ayscough, Andrew P.,Gattrell, William T.,Raynham, Tony M.

, p. 3096 - 3106 (2000)

The presence of the Q group in ring-opening reactions of N-(Q)-aziridines 3, 4, 5 and 6 has been found to be advantageous in the following ways, (i) nucleophilic ring-opening by cuprate or by azide with inversion of configuration is assisted by the electron-withdrawing character of the Q group, (ii) ring-opening of aziridines 5 or 6 to the corresponding alcohols 36 and 23 with retention of configuration can be accomplished by participation of the Q group: the Q carbonyl oxygen becomes the hydroxy oxygen in the alcohol product, (iii) the combined effects of the electron-withdrawing Q group and ring strain allow preparation of individual aziridine N-invertomers 3 and 4 whose ring-opening with hydrogen chloride in dichloromethane proceeds with complementary stereochemistry. The Q group is also believed to be involved in ring-opening of aziridines 5 and 6 mediated by samarium(III) nitrate hexahydrate with predominant retention of configuration. Reductive removal of the Q group from these ring-opened products gave chirons 12, 19 and 21. The Royal Society of Chemistry 2000.

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