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23351-72-6

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23351-72-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 23351-72-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,3,5 and 1 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 23351-72:
(7*2)+(6*3)+(5*3)+(4*5)+(3*1)+(2*7)+(1*2)=86
86 % 10 = 6
So 23351-72-6 is a valid CAS Registry Number.

23351-72-6Relevant articles and documents

A bridge linking and its application of metal complexes

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Paragraph 0072, (2017/02/23)

The invention discloses a bridged metallocene complex, which is characterized by having a structural formula shown as the following A1, A2, A3 or A4. The invention also discloses a preparation method of ethylene propylene rubber. The ethylene propylene ru

Process for preparing 1-indanones

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, (2008/06/13)

The present invention relates to a process for preparing 1-indanones of formula I: and isomers thereof, wherein R1, R2, R3, R4, R5, and R6 independently represent H or a C1-C20 hydrocarbon group or R1 and R2 or R2 and R3 or R3 and R4 and/or R5 and R6 together with the carbon atoms to which they are attached form a saturated or unsaturated 5- or 6-membered ring, said hydrocarbon group and/or said ring optionally containing one or more hetero atoms, said ring optionally being substituted with a C1-C4 hydrocarbon group, said process comprising reacting a compound of formula II: wherein R1, R2, R3, R4, R5, and R6 have the same meaning as defined above, with a chlorinating agent, followed by reaction with a Friedel-Crafts catalyst. The invention further relates to the preparation of the corresponding indenes.

Carboxylic Trifluoromethanesulfonic Anhydrides as Highly Effective Acylation Agents. - Perfluoroalkanesulfonic Acid Catalyzed Acylation of Arenes

Effenberger, Franz,Sohn, Erich,Epple, Gerhard

, p. 1195 - 1208 (2007/10/02)

Arene- and alkanecarboxylic trifluoromethanesulfonic anhydrides 2 and 5 are highly effective acylation agents, which react without Friedel-Crafts catalysts even with deactivated aromatics to yield aryl ketones 3 and 6, respectively.Acylation of arenes with carbonyl chlorides 4 and catalytic amounts of perfluoroalkanesulfonic acid gives ketones 3 and 6, resp., in good yields.Under similar conditions other strong Broensted acids show a considerably smaller degree of catalytic effect.

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