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1244778-22-0

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1244778-22-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1244778-22-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,4,7,7 and 8 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1244778-22:
(9*1)+(8*2)+(7*4)+(6*4)+(5*7)+(4*7)+(3*8)+(2*2)+(1*2)=170
170 % 10 = 0
So 1244778-22-0 is a valid CAS Registry Number.

1244778-22-0Relevant articles and documents

Extending conjugation in porphyrin dimer carbocations

Thorley, Karl J.,Anderson, Harry L.

, p. 3472 - 3479 (2010)

The addition of alkynyl porphyrins to carbonyl compounds was used to prepare a series of porphyrin dimer tertiary alcohols. Treatment of these alcohols with acid gave conjugated carbocations with three to nine carbon atoms bridging between the porphyrins. All these carbocations show strong absorption in the near-IR region between 1000-1800 nm. The absorption spectra exhibit a length-dependence similar to that of polymethine cyanines, with a bathochromic shift of approximately 200 nm (900 cm-1) per alkyne. The longest of these chromophores has an absorption maximum at 1623 nm (in CHCl3 with 2% trifluoroacetic acid). The symmetry of the π-system has a strong effect on the position, intensity and width of the absorption bands. The stability of the cations in solution decreases with increasing bridge length. The Royal Society of Chemistry 2010.

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