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195881-28-8

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195881-28-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 195881-28-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,8,8 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 195881-28:
(8*1)+(7*9)+(6*5)+(5*8)+(4*8)+(3*1)+(2*2)+(1*8)=188
188 % 10 = 8
So 195881-28-8 is a valid CAS Registry Number.

195881-28-8Downstream Products

195881-28-8Relevant articles and documents

Nucleotides. Part LXXIII: Oligoribonucleotide synthesis with the (2-cyano-1-phenylethoxy)carbonyl (2c1peoc) group for the 5′-hydroxy protection

Muench, Ursula,Pfleiderer, Wolfgang

, p. 2546 - 2565 (2007/10/03)

The (2-cyano-1-phenylethoxy)carbonyl (2c1peoc) group was developed as a new base-labile protecting group for the 5′-OH function in solid-phase synthesis of oligoribonucleotides via the phosphoramidite approach. The half-lives of its β-elimination process by 0.1M DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) were determined to be 7-14s by HPLC investigations. The 2′-OH function was protected with the acid-labile tetrahydro-4-methoxy-2H-pyran-4-yl (thmp) group, while the 2-(4-nitrophenyl)ethyl (npe) and 2-(4-nitrophenyl)ethoxycarbonyl (npeoc) groups were used for the protection of the base and phosphate moieties. The syntheses of the monomeric building blocks, both phosphoramidites and nucleoside-functionalized supports, as well as the build-up of oligoribonucleotides by means of this approach are described.

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