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186772-47-4

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186772-47-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 186772-47-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,7,7 and 2 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 186772-47:
(8*1)+(7*8)+(6*6)+(5*7)+(4*7)+(3*2)+(2*4)+(1*7)=184
184 % 10 = 4
So 186772-47-4 is a valid CAS Registry Number.

186772-47-4Relevant articles and documents

Synthesis of butadiyne-bridged [4n] metacyclophanes having exo-annular t-butyl groups

Tobe, Yoshito,Utsumi, Naoto,Nagano, Atsushi,Sonoda, Motohiro,Naemura, Koichiro

, p. 8075 - 8083 (2007/10/03)

Butadiyne-bridged [44]- and [48]metacyclophanes having exo-annular t-butyl groups were prepared by intermolecular Eglinton coupling of the dimeric unit or by intramolecular ring closure of the linear tetramer. Comparison of the 1H and 13C NMR spectra of [44]metacyclophane with those of [48]cyclophane and diphenylbutadiyne revealed its prominent geometrical feature due to deformation of the triple bonds from linearity. The [44]Metacyclophane was converted into [08]thiophenometacyclophane in good yield by treatment with sodium sulfide.

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