6542-56-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6542-56-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,5,4 and 2 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 6542-56:
(6*6)+(5*5)+(4*4)+(3*2)+(2*5)+(1*6)=99
99 % 10 = 9
So 6542-56-9 is a valid CAS Registry Number.
InChI:InChI=1/C7H12O2/c1-3-7-8-5-4-6(2)9-7/h3,6-7H,1,4-5H2,2H3
6542-56-9Relevant articles and documents
Synthesis of tetrahydrofuran
-
, (2008/06/13)
This invention provides a process for producing tetrahydrofuran by the reaction of 3-(5'-alkyl-1',3'-dioxane)-propionaldehyde and/or 3-(5'-alkyl-1',3'-dioxane)propanol and/or 4-hydroxybutanal with hydrogen in an aqueous medium having a pH between about 0.1 and 5. Maintenance of the reaction medium within the specified acidic range of pH is an important feature of the invention process.