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3309-52-2

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3309-52-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 3309-52-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,3,0 and 9 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 3309-52:
(6*3)+(5*3)+(4*0)+(3*9)+(2*5)+(1*2)=72
72 % 10 = 2
So 3309-52-2 is a valid CAS Registry Number.

3309-52-2Relevant articles and documents

Cyclohexyloxycarbonyl based orthogonal solid phase peptide synthesis in Boc chemistry

Mezo, Gabor,Mihala, Nikolett,Koczan, Gyoergy,Hudecz, Ferenc

, p. 6757 - 6766 (2007/10/03)

Application of N-cyclohexyloxocarbonyl (Choc) protection in Boc chemistry on solid phase provides a new possibility for the preparation of protected peptide fragments. A Choc/OcHex protection scheme allows also the assembly of cyclic lactam peptides linked to the resin through the C- terminus. Choc protection is stable under the 1M TMSOTf-thioanisole/TFA cleavage condition at 0°C, but it is removable by anhydrous HF. We have utilized cyclohexyloxycarbonyl as an orthogonal protecting group for the synthesis of a i) bicyclic epitope peptide of glycoprotein D of HSV 1 on BHA resin and ii) fully protected hexapeptide involved in protein transport on Merrifield resin.

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