139117-50-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139117-50-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,1,1 and 7 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 139117-50:
(8*1)+(7*3)+(6*9)+(5*1)+(4*1)+(3*7)+(2*5)+(1*0)=123
123 % 10 = 3
So 139117-50-3 is a valid CAS Registry Number.
139117-50-3Relevant articles and documents
Total synthesis of queen substance of honeybee using an organosilicon route
Bellassoued,Majidi
, p. 7253 - 7254 (1991)
O-silylated enolates are used as the key intermediates in the total synthesis of queen substance. The synthesis proceeds in 7 steps and affords the desired pheromone with very high stereoselectivity and 34% overall yield.
