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144105-57-7

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144105-57-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144105-57-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,1,0 and 5 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 144105-57:
(8*1)+(7*4)+(6*4)+(5*1)+(4*0)+(3*5)+(2*5)+(1*7)=97
97 % 10 = 7
So 144105-57-7 is a valid CAS Registry Number.

144105-57-7Upstream product

144105-57-7Downstream Products

144105-57-7Relevant articles and documents

Structural Studies on Phenanthropyrene and its 9,10-Dihydro-Derivative: Dependence of Chemical Shift on Degree of Planarity of and Buttressing Effect in the Polycyclic Aromatic Compounds

Lai, Yee-Hing,Ang, Slau-Gek,Li, Hwee-Chze,Wong, Siew-Ying

, p. 1315 - 1319 (2007/10/02)

The first example of a transannular reaction of a syn-metacyclophane derivative via photochemical iodination has been employed in the preparation of 9,10-dihydrophenanthropyrene (2).The structural studies of 2 and the phenanthropyrene 1 were carried out by 1D and 2D NMR spectroscopic analyses.Qualitative correlation between tilting of the fused moieties and the change in deshielding effect was observed by probing the chemical shifts of H3 and H1' (H6 and H8').Buttressing effects resulting from the steric interaction of H3 and H1' (H6 and H8'), althoughdiffering in magnitudes for the two groups of protons (H3->H2->H1->H10 and H1'->H2'->H3'->H4'), seem to transmit evenly among those on the same moiety according to a simple additivity rule.

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