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40089-09-6

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40089-09-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40089-09-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,0,8 and 9 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 40089-09:
(7*4)+(6*0)+(5*0)+(4*8)+(3*9)+(2*0)+(1*9)=96
96 % 10 = 6
So 40089-09-6 is a valid CAS Registry Number.

40089-09-6Relevant articles and documents

One-Pot Twofold Unsymmetrical C-Si Bond 2,6-Bifunctionalization of Arenes via Sequential [1,4]-Csp2 to O-Silyl Migration

Wang, Kai,Li, Linjie,Hu, Tianbao,Gao, Lu,Song, Zhenlei

, p. 12583 - 12595 (2019)

Twofold unsymmetrical C-Si bond bifunctionalization of 2,6-di(trimethylsilyl) benzyl alcohols has been achieved in one pot via sequential [1,4]-Csp2 to O-silyl migration. The hydroxyl group functions as an "on-off-on" switch to control two successive silyl migrations, and 4,7-dimethyl-o-phenanthroline ligand favors cleavage of the endocyclic C-Si bond. Diverse Csp3/Csp3 or Csp2/Csp3 electrophiles can be installed at the 2- and 6-positions. This approach was used to chemoselectively functionalize the three C-Si bonds of 2,4,6-tri(trimethylsilyl) benzyl alcohol, transforming it into isochroman derivatives. The approach even works as a five-component reaction to construct complex symmetric structures.

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