309923-57-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 309923-57-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,9,9,2 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 309923-57:
(8*3)+(7*0)+(6*9)+(5*9)+(4*2)+(3*3)+(2*5)+(1*7)=157
157 % 10 = 7
So 309923-57-7 is a valid CAS Registry Number.
InChI:InChI=1/C16H13NO5/c18-15(17-11-7-5-10(6-8-11)16(19)20)14-9-21-12-3-1-2-4-13(12)22-14/h1-8,14H,9H2,(H,17,18)(H,19,20)
309923-57-7Relevant academic research and scientific papers
Synthesis of diamides from 1,4-Benzodioxane-2-and isochroman-1-carboxylic acids
Vartanyan,Sargsyan,Avakyan,Markaryan,Asatryan
, p. 972 - 976 (2012/11/07)
1,4-Benzodioxane-2-carboxylic acid and isochroman-1-carboxylic acid were treated with thionyl chloride, and the resulting acid chlorides reacted with p-aminobenzoic acid in dioxane in the presence of pyridine to produce the corresponding amido acids. The
