281681-94-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 281681-94-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,1,6,8 and 1 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 281681-94:
(8*2)+(7*8)+(6*1)+(5*6)+(4*8)+(3*1)+(2*9)+(1*4)=165
165 % 10 = 5
So 281681-94-5 is a valid CAS Registry Number.
281681-94-5Relevant articles and documents
Synthesis of (+)-casuarine.
Denmark,Hurd
, p. 1311 - 1314 (1999)
[formula: see text] The first synthesis of (+)-casuarine, a pentahydroxy pyrrolizidine alkaloid, is described. The key bond-forming events occur in a tandem [4 + 2]/[3 + 2] nitroalkene cycloaddition involving nitroalkene 6, chiral vinyl ether 7b, and viny