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99643-51-3

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99643-51-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99643-51-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,6,4 and 3 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 99643-51:
(7*9)+(6*9)+(5*6)+(4*4)+(3*3)+(2*5)+(1*1)=183
183 % 10 = 3
So 99643-51-3 is a valid CAS Registry Number.

99643-51-3Relevant articles and documents

Electronic Structure of Heterospirenes-PE Spectroscopic Investigations

Gleiter, Rolf,Uschmann, Joachim

, p. 370 - 380 (2007/10/02)

The synthesis of the heterospirenes 1-9 is described and their He I photoelectron (PE) spectra are recorded.The assignment of the first PE bands is based on a comparison with fragment molecules and on molecular orbital calculations using semiempirical methods (PPP, MINDO/3). in the case of 1, 2, 4, and 5 strong spirointeraction has been elucidated.For 3 the analysis of the spectrum is hampered due to the strong overlap of the bands while for 6 the nonplanarity brings about a reduction of spirointeractions.For 7-9 the interaction between both fragments could not be detected.

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