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229305-81-1

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229305-81-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 229305-81-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,9,3,0 and 5 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 229305-81:
(8*2)+(7*2)+(6*9)+(5*3)+(4*0)+(3*5)+(2*8)+(1*1)=131
131 % 10 = 1
So 229305-81-1 is a valid CAS Registry Number.

229305-81-1Relevant articles and documents

Novel regio- and stereoselective cascade 6-endo-trig cyclisations from polyene acyl radical intermediates leading to steroid-like pentacycles and heptacycles

Handa, Sandeep,Nair, Prathap S.,Pattenden, Gerald

, p. 2629 - 2643 (2007/10/03)

In a quite remarkable regio- and stereoselective manner, each of the (all-E)-polyene selenoates 5a-c is shown to undergo cascade radical-mediated polycyclisations via consecutive 6-endo-trig reactions, leading to the corresponding all-trans, anti, tri-, penta- and heptacycles, i.e., 20, 23, and 25, in good yields. The configurations of these 'steroid-like' polycycles followed from detailed examination and correlation of chemical shift data in their 13C-NMR spectra.

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