157952-81-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157952-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,9,5 and 2 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 157952-81:
(8*1)+(7*5)+(6*7)+(5*9)+(4*5)+(3*2)+(2*8)+(1*1)=173
173 % 10 = 3
So 157952-81-3 is a valid CAS Registry Number.
157952-81-3Relevant articles and documents
Furans from novel [3+2] photocycloaddition of alkenes to 2-(1-alkynyl)cyclohexenones
Margaretha,Reichow,Agosta
, p. 5393 - 5396 (2007/10/02)
Photocycloaddition of 2-alkynyl-substituted cyclohexenones 8c-11c with isobutylene (2) and tetramethylethylene (3a) leads to tricyclic furans 15a-18a and 15b-17b, respectively, in gas chromatographic yields of ~90%. A suggested mechanism for this novel pr