137709-22-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 137709-22-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,7,0 and 9 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 137709-22:
(8*1)+(7*3)+(6*7)+(5*7)+(4*0)+(3*9)+(2*2)+(1*2)=139
139 % 10 = 9
So 137709-22-9 is a valid CAS Registry Number.
137709-22-9Relevant academic research and scientific papers
Synthesis and Characterization of Doubly-Strapped Porphyrins
Nagata, Toshi
, p. 385 - 391 (2007/10/02)
Synthesis of a "doubly-strapped" porphyrin is described, which has two -O(CH2)10O- straps on both sides of the porphyrin ring.This porphyrin did not form the zinc complex when treated with zinc acetate, even under forcing conditions.Such inertness toward
