139750-81-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 139750-81-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,7,5 and 0 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 139750-81:
(8*1)+(7*3)+(6*9)+(5*7)+(4*5)+(3*0)+(2*8)+(1*1)=155
155 % 10 = 5
So 139750-81-5 is a valid CAS Registry Number.
139750-81-5Relevant academic research and scientific papers
Chiral acetylenic sulfoxide in alkaloid synthesis. Total synthesis of (R)-(+)-carnegine
Lee,Chan,Lee
, p. 6861 - 6864 (2007/10/02)
Remarkable diastereoselectivity was observed in the cyclization of β-aminovinyl sulfoxide 5a prepared from chiral acetylenic sulfoxide 1a in acidic medium. The cyclized product 6a was then converted to (R)-(+)-carnegine.
