681283-28-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 681283-28-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,8,1,2,8 and 3 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 681283-28:
(8*6)+(7*8)+(6*1)+(5*2)+(4*8)+(3*3)+(2*2)+(1*8)=173
173 % 10 = 3
So 681283-28-3 is a valid CAS Registry Number.
681283-28-3Relevant academic research and scientific papers
Synthesis of 2′,3′-Dideoxy-2′-difluoromethyl Azanucleosides
Qiu, Xiao-Long,Qing, Feng-Ling
, p. 334 - 340 (2007/10/03)
Methyl (2S,4S)-N-tert-butoxycarbonyl-4-difluoromethylpyroglutamate (9a) was synthesized from trans-4-hydroxy-L-proline (5). Compound 9a was converted to (5S,3S)-N-benzyloxycarbonyl-5-(tert-butyldimethylsilyloxymethyl-3- difluoromethyl-2-pyrrolidone (15) o
