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149554-42-7

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149554-42-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 149554-42-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,9,5,5 and 4 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 149554-42:
(8*1)+(7*4)+(6*9)+(5*5)+(4*5)+(3*4)+(2*4)+(1*2)=157
157 % 10 = 7
So 149554-42-7 is a valid CAS Registry Number.

149554-42-7Relevant articles and documents

Synthesis of Substituted Fluorenones and Substituted 3',3'-Dichlorospiro and Their Reactivities

Chew, Warren,Hynes, Rosemary C.,Harpp, David N.

, p. 4398 - 4404 (2007/10/02)

Several novel 9-fluorenones were synthesized and were used as precursors in an attempt to prepare unique substituted 3',3'-dichlorospiro.Several of the thiiranes were unstable and desulfurized during their preparation (7a-d, 11, 12). 3',3'-Dichloro(2,5-dimethoxyspiro (7f) was prepared along with 2,2-dichloro-3,3-bis(4-methoxyphenyl)thiirane (16), and 3',3'-dichloro-10,11-dihydrospirocycloheptane-5,2'-thiirane> (17) all of which were stable at room temperature.A study of the reactivity of fluorenyl-substituted thiiranes and other related thiiranes showed that the extent of aromaticity of the substituents at the 3-position of the thiiranes influences their stabilities.

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