Cas 73857-99-5,C18H16O2S2

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Check Digit Verification of cas no

The CAS Registry Mumber 73857-99-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,8,5 and 7 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 73857-99:
(7*7)+(6*3)+(5*8)+(4*5)+(3*7)+(2*9)+(1*9)=175
175 % 10 = 5
So 73857-99-5 is a valid CAS Registry Number.

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73857-99-5Relevant academic research and scientific papers

PHOTOCHROMIC AND THERMOCHROMIC SPIROPYRANS. 10. PHOTOCHROMIC SPIROPYRANS OF THE DITHIOLANE SERIES

Lokshin, V.A.,Trofimova, N.S.,Voloshin, N.A.,Revinskii, Yu.V.,Shelepin, N.E.,et.al.

, p. 38 - 41 (1980)

The preparation of 1,3-dithiolanium salts from 1,2-ethanedithiol and carboxylic acid chlorides, the subsequent condensation of which with aromatic o-hydroxy aldehydes leads to spiropyrans of the dithiolane series, is described.The PMR spectra were studied, and the photochromic properties are discussed.

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