91508-49-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91508-49-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,5,0 and 8 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 91508-49:
(7*9)+(6*1)+(5*5)+(4*0)+(3*8)+(2*4)+(1*9)=135
135 % 10 = 5
So 91508-49-5 is a valid CAS Registry Number.
91508-49-5Relevant academic research and scientific papers
Synthesis of 5,7-Dichloro-2H-1-benzopyran-2-ol
Stokker, G. E.
, p. 609 - 610 (2007/10/02)
The reaction of 4,6-dichloro-2-(methylthiomethoxy)cinnamaldehyde (3) or 4,6-dichloro-2-hydroxycinnamaldehyde (5) with mercuric chloride in hot aqueous acetonitrile gave 5,7-dichloro-2H-1-benzopyran-2-ol (4) in good yield.
