81289-45-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81289-45-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,8 and 9 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 81289-45:
(7*8)+(6*1)+(5*2)+(4*8)+(3*9)+(2*4)+(1*5)=144
144 % 10 = 4
So 81289-45-4 is a valid CAS Registry Number.
81289-45-4Relevant articles and documents
Sodium Borohydride Reduction of 3-Nitro-2-substituted-phenyl-2H-benzopyrans
Arora, P. K.,Bhaduri, A. P.
, p. 951 - 954 (2007/10/02)
Reaction of 3-nitro-2-substituted-phenyl-2H-benzopyrans (1-8) with NaBH4 at 5-10 deg C followed by reduction of the nitro group with hydrazine hydrate in the presence of Raney-nickel furnishes 3-amino-2-substituted-phenyl-3,4-dihydro-2H-benzopyrans
