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174742-56-4

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174742-56-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 174742-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,4,7,4 and 2 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 174742-56:
(8*1)+(7*7)+(6*4)+(5*7)+(4*4)+(3*2)+(2*5)+(1*6)=154
154 % 10 = 4
So 174742-56-4 is a valid CAS Registry Number.

174742-56-4Downstream Products

174742-56-4Relevant articles and documents

Synthesis, spectroscopy and structure of phenylated cyclopentasilanes

P?schl, Ulrich,Siegl, Harald,Hassler, Karl

, p. 93 - 100 (2007/10/02)

Phenylated cyclopentasilanes Si5Ph10-nXn with X = OSO2CF3, F, Cl, Br, I or H and n = 1 or 2 were prepared in high yield by dearylation of Si5Ph10 with trifluoromethanesulphonic acid (CF3SO3H) and subsequent reaction with lithium or potassium halides and LiAlH4. The trans-1,3-isomers of Si5Ph8X2 were isolated by crystallization and the crystal structure of trans-1,3-difluorooctaphenyl- cyclopentasilane was determined. cis-1,3-, trans-1,2- and cis-1,2-Si5Ph8X2 were identified and characterized by 1H, 19F and 29Si NMR spectroscopy. Si-Si coupling constants were measured using INADEQUATE pulse sequences.

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