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21405-51-6

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21405-51-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21405-51-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,0 and 5 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21405-51:
(7*2)+(6*1)+(5*4)+(4*0)+(3*5)+(2*5)+(1*1)=66
66 % 10 = 6
So 21405-51-6 is a valid CAS Registry Number.

21405-51-6SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 15, 2017

Revision Date: Aug 15, 2017

1.Identification

1.1 GHS Product identifier

Product name 3,5-dichlorocyclohexa-3,5-diene-1,2-dione

1.2 Other means of identification

Product number -
Other names 3,5-Cyclohexadiene-1,2-dione,3,5-dichloro

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:21405-51-6 SDS

21405-51-6Downstream Products

21405-51-6Relevant articles and documents

Dearomatization of Electron-Deficient Phenols to ortho-Quinones: Bidentate Nitrogen-Ligated Iodine(V) Reagents

Xiao, Xiao,Greenwood, Nathaniel S.,Wengryniuk, Sarah E.

supporting information, p. 16181 - 16187 (2019/11/05)

Despite their broad utility, the synthesis of ortho-quinones remains a significant challenge, in particular, access to electron-deficient derivatives remains an unsolved problem. Reported here is the first general method for the synthesis of electron-deficient ortho-quinones by direct oxidation of phenols. The reaction is enabled by a novel bidentate nitrogen-ligated iodine(V) reagent, a previously unexplored class of compounds which we have termed Bi(N)-HVIs. The reaction is extremely general and proceeds with excellent regioselectivity for the ortho over para isomer. Functionalization of the ortho-quinone products was examined, resulting in a facile one-pot synthesis of catechols, as well as the incorporation of a variety of heteroatom nucleophiles. This method represents the first synthetic application of Bi(N)-HVIs and demonstrates their potential as a platform for the further development of highly reactive, but also highly tunable, I(V) reagents.

Reactions of polar dienes with o-quinones

Paquet, Jacques,Brassard, Paul

, p. 1354 - 1358 (2007/10/02)

The behaviour of various types of polar dienes towards halogenated ortho quinones has been investigated in a number of representative cases.As compared to the commonly used para analogues, o-quinones provide a wide range of products that indicate a keener response to the nature, number, and position of substituents on both reactants. 3-Halogenated-o-naphthoquinones 1 and 2 react smoothly with a representative vinologous ketene acetal 3, vinylketene acetals 4 and 5, and a monooxygenated diene 6 to provide variously substituted phenanthrenequinones 7-11.Only monooxygenated dienes on the other hand add to o-benzoquinones 14-16 and give convenient syntheses of the corresponding o-naphthoquinones 18-20.Key words: cycloaddition, o-naphthoquinones, phenanthrenequinones, regiospecificity.

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