129855-40-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 129855-40-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,8,5 and 5 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 129855-40:
(8*1)+(7*2)+(6*9)+(5*8)+(4*5)+(3*5)+(2*4)+(1*0)=159
159 % 10 = 9
So 129855-40-9 is a valid CAS Registry Number.
129855-40-9Relevant academic research and scientific papers
A concise synthesis of penems
Barker,Campbell,Jenkins
, p. 4359 - 4362 (2007/10/02)
A brief and efficient new synthesis of 2-substituted 6-[1(R)-hydroxyethyl]-penems is described. The key step involves reaction of an azetidin-2-one-4-disulphide with either stabilized or unstablized phosphoranes, giving ylids which cyclize with the 1-oxalimide group to give 2-substituted penems.
