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639808-04-1

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639808-04-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 639808-04-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,8,0 and 8 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 639808-04:
(8*6)+(7*3)+(6*9)+(5*8)+(4*0)+(3*8)+(2*0)+(1*4)=191
191 % 10 = 1
So 639808-04-1 is a valid CAS Registry Number.

639808-04-1Relevant articles and documents

The Use of a Mannitol-Derived Fused Oxacycle as a Combinatorial Scaffold

Timmer, Mattie S. M.,Verdoes, Martijn,Sliedregt, Leo A. J. M.,Van Der Marel, Gijsbert A.,Van Boom, Jacques H.,Overkleeft, Herman S.

, p. 9406 - 9411 (2003)

An efficient and high-yielding solid-phase synthesis of a small library of compounds containing a cis-fused pyranofuran structural motive is descibed. With use of the cheap and readily available D-(+)-mannitol, a highly functionalized sugar template was synthesized and immobilized on a solid support via an olefinic linker. Modification of this two-point molecular scaffold and subsequent ring-closing metathesis/cleavage gave access to a series of functionalized conformationally constrained fused oxacycles.

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