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1309953-42-1

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1309953-42-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1309953-42-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,0,9,9,5 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1309953-42:
(9*1)+(8*3)+(7*0)+(6*9)+(5*9)+(4*5)+(3*3)+(2*4)+(1*2)=171
171 % 10 = 1
So 1309953-42-1 is a valid CAS Registry Number.

1309953-42-1Relevant articles and documents

Synthesis and structural revision of phomopsin B, a novel polyketide carrying a 10-membered cyclic-ether ring

Izuchi, Yuko,Koshino, Hiroyuki,Hongo, Yayoi,Kanomata, Nobuhiro,Takahashi, Shunya

, p. 3360 - 3363 (2011/08/22)

Total synthesis of the proposed structure 2 for phomopsin B was achieved by using an intramolecular olefin metathesis as a key step. The spectral data, however, did not match with those of the natural product reported. Re-examination of the reported NMR data led to the structural revision of phomopsin B to known dothiorelone A 18. The R configuration of dothiorelone A was determined by total synthesis through a cross-metathesis with a chiral olefin 19.

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