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131980-48-8

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131980-48-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131980-48-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,8 and 0 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 131980-48:
(8*1)+(7*3)+(6*1)+(5*9)+(4*8)+(3*0)+(2*4)+(1*8)=128
128 % 10 = 8
So 131980-48-8 is a valid CAS Registry Number.

131980-48-8Relevant articles and documents

Synthesis of 9-Methoxymethyl-18-methyl-2,11-dithiametacyclophane: a Dithiametacyclophane with a Protected Internal Benzylic Functional Group

Lai, Yee-Hing,Tan, Quee-May

, p. 1783 - 1788 (2007/10/02)

A synthetic route to a dithiametacyclophane with a benzylic functional (methoxymethyl) group at C9 is described.The benzylic function however had to be introduced at a later stage in the synthetic scheme to optimize the overall yield.Only the anti isomer of the desired dithiacyclophane (7) was isolated.The entire methoxymethyl group lies within the shielding zone of the opposite benzene ring as indicated in the 1H n.m.r. spectrum.Attempts to convert anti-(7) into the novel aromatic system (5b) by a rearrangement-elimination sequence however failed.

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