81238-33-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81238-33-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,3 and 8 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81238-33:
(7*8)+(6*1)+(5*2)+(4*3)+(3*8)+(2*3)+(1*3)=117
117 % 10 = 7
So 81238-33-7 is a valid CAS Registry Number.
81238-33-7Relevant articles and documents
A New Synthesis of Macrocyclic Lactones by Rearrangement of 2-Hydroxyalkyl-2-phenylsulphonylcycloalkanones
Bhat, Venkatramana,Cookson, Richard C.
, p. 1123 - 1124 (2007/10/02)
2-Hydroxyalkyl-2-phenylsulphonylcycloalkanones undergo base-catalysed isomerisation into phenylsulphonyl-lactones with incorporation of the side-chain into the ring.