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209216-57-9

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209216-57-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 209216-57-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,9,2,1 and 6 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 209216-57:
(8*2)+(7*0)+(6*9)+(5*2)+(4*1)+(3*6)+(2*5)+(1*7)=119
119 % 10 = 9
So 209216-57-9 is a valid CAS Registry Number.

209216-57-9Relevant articles and documents

Synthesis of protected derivatives of 3-pyrrolylalanine

Beecher, Jody E.,Tirrell, David A.

, p. 3927 - 3930 (2007/10/03)

Protected derivatives of 3-pyrrolylalanine (3-PA) have been synthesized starting with N-tri(isopropyl)silylpyrrole. Following formylation and Boc protection, treatment with (±)-N-(benzyloxycarbonyl)-α-phosphonoglycine trimethyl ester provided a fully protected dehydro-3-pyrrolylalanine. Reduction of the double bond and removal of the methyl ester groups yielded 3-PA protected at the α- and pyrrole nitrogens. 3-PA is only transiently stable following N-deprotection.

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