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109687-59-4

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109687-59-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 109687-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,6,8 and 7 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 109687-59:
(8*1)+(7*0)+(6*9)+(5*6)+(4*8)+(3*7)+(2*5)+(1*9)=164
164 % 10 = 4
So 109687-59-4 is a valid CAS Registry Number.

109687-59-4Relevant articles and documents

New Approaches to the Synthesis of trans-Alkene Isosteres of Dipeptides

Spaltenstein, Andreas,Carpino, Philip A.,Miyake, Fumio,Hopkins, Paul B.

, p. 3759 - 3766 (1987)

Two new syntheses of protected dipeptide analogues bearing a trans carbon-carbon double bond in place of the amide linkage are reported.One route is a linear synthesis employing the rearrangement of an allylic selenide to a protected allylic amine.The second route is convergent and uses the Julia olefin synthesis in a key step.The latter route is fully stereocontrolled and has been used to prepare protected trans-alkene isosteres of the dipeptides TyrAla, PhePhe, LeuPhe, and LeuLeu.

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