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309721-38-8

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309721-38-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 309721-38-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,9,7,2 and 1 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 309721-38:
(8*3)+(7*0)+(6*9)+(5*7)+(4*2)+(3*1)+(2*3)+(1*8)=138
138 % 10 = 8
So 309721-38-8 is a valid CAS Registry Number.

309721-38-8Relevant articles and documents

General synthesis of epi-series catechins and their 3-gallates: Reverse polarity strategy

Ohmori, Ken,Yano, Takahisa,Suzuki, Keisuke

supporting information; experimental part, p. 2693 - 2696 (2010/08/21)

A general synthetic route to the epi-series catechins was developed based on the reverse polarity strategy. Aromatic nucleophilic substitution reaction followed by the sulfinyl-metal exchange and cyclization enabled stereo-controlled access to various members of epi-series catechins and their 3-gallates.

Stereoselective synthesis of (2R, 3R)- and (2S, 3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxan-6-carbaldehyde

Gu,Chen,Jing,Pan

, p. 397 - 399 (2007/10/03)

A novel stereoselective synthetic approach to 1,4-benzodioxane lignans was reported in which (2R, 3R)- and (2D, 3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxan-6-carbaldehyde were first synthesised.

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