139903-64-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139903-64-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,9,0 and 3 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 139903-64:
(8*1)+(7*3)+(6*9)+(5*9)+(4*0)+(3*3)+(2*6)+(1*4)=153
153 % 10 = 3
So 139903-64-3 is a valid CAS Registry Number.
139903-64-3Relevant academic research and scientific papers
Synthesis of 5,6-dihydroxy-tetrahydro-isobenzofuranones
Rachenzentner,Urban
, p. 101 - 105 (2007/10/02)
Starting with 5,6-dihydroxyperhydro-isobenzofuranone (1) acetals 2a and 3a were prepared which were lithiated and reacted with electrophiles to give α-methyl- (2b and 3b), α-phenylselenyl-lactones (2c and 3c), and α-bromolactone 2d with retention of confi
