139209-87-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139209-87-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,2,0 and 9 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 139209-87:
(8*1)+(7*3)+(6*9)+(5*2)+(4*0)+(3*9)+(2*8)+(1*7)=143
143 % 10 = 3
So 139209-87-3 is a valid CAS Registry Number.
139209-87-3Relevant academic research and scientific papers
An efficient synthesis of 3-benzyl-1-thiochromones and 3-benzyl-1,4-dithiochromones
Levai, A.,Szabo, Z.
, p. 976 - 978 (2007/10/02)
3-Benzyl-4H-1-benzothiopyran-4-ones 3-10 have been synthesized by the piperidine-catalyzed reaction of thiochroman-4-one 1 and 2-phenylthiochroman-4-one 2 with aromatic aldehydes.Compounds 3-10 gave 3-benzyl-4H-1-benzothiopyran-4-one 1,1-dioxides 11-18 on
