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720-21-8

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720-21-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 720-21-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,2 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 720-21:
(5*7)+(4*2)+(3*0)+(2*2)+(1*1)=48
48 % 10 = 8
So 720-21-8 is a valid CAS Registry Number.

720-21-8SDS

SAFETY DATA SHEETS

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

Version: 1.0

Creation Date: Aug 18, 2017

Revision Date: Aug 18, 2017

1.Identification

1.1 GHS Product identifier

Product name cyclobutane-1,2,3,4-tetracarboxylic acid

1.2 Other means of identification

Product number -
Other names trans,trans,trans-1,2,3,4-Tetracarboxy-cyclobutan

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:720-21-8 SDS

720-21-8Relevant articles and documents

A novel example of double reactivity by either photochemical [2+2] or thermal additions of an ionic organic supramolecular assembly

Brice?o, Alexander,Leal, Dayana,Díaz De Delgado, Graciela

, p. 4965 - 4971 (2015/06/16)

An example of double reactivity in the solid state was achieved from a single binary array directed by charge-assisted hydrogen bonds assembled via mechanochemistry: [(HFu-)(Im+)] (1). The photochemical transformation of 1 occurs via a topotactic fashion with a quantitative yield followed by a second grinding-irradiation cycle. The recrystallisation of the photoproduct produces a novel hydrogen supramolecular isomer of [(rctt-H2Cbtc2-)(Im+)2] (2). Another example of the regioselective and quantitative preparation of rtct-cyclobutane isomers was obtained from the controlled isomerisation of 2 under hydrothermal conditions. Upon heating, 1 produced an unexpected hydroamination product (3) in almost quantitative yield. The stereochemistry of products 2 and 3 was confirmed by X-ray single crystal diffraction analysis.

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