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201207-50-3

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201207-50-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 201207-50-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,2,0 and 7 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 201207-50:
(8*2)+(7*0)+(6*1)+(5*2)+(4*0)+(3*7)+(2*5)+(1*0)=63
63 % 10 = 3
So 201207-50-3 is a valid CAS Registry Number.

201207-50-3Relevant articles and documents

Total synthesis of (-)-macrocarpal C. Stereoselective coupling reaction with a novel hexasubstituted benzene Cr(CO)3 complex as a biomimetic chiral benzyl cation equivalent

Tanaka, Tetsuaki,Mikamiyama, Hidenori,Maeda, Kimiya,Iwata, Chuzo,In, Yasuko,Ishida, Toshimasa

, p. 9782 - 9793 (2007/10/03)

The first total synthesis of (-)-macrocarpal C (3) is described. The synthesis features a highly stereoselective coupling reaction of silyldienol ether 6 with biomimetic benzyl cation species (R)- and (S)-B, which were generated from novel hexasubstituted benzene chromium tricarbonyl complexes (R)- and (S)-17. At the final step of the total synthesis, we developed the tris-O-demethylation of macrocarpal C trimethyl ether 34 under basic conditions using lithium p-thiocresolate. Moreover, spectroscopic evidence shows that the synthetic (-)-3 is identical to natural macrocarpal G (4).

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