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5631-67-4

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5631-67-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5631-67-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,6,3 and 1 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 5631-67:
(6*5)+(5*6)+(4*3)+(3*1)+(2*6)+(1*7)=94
94 % 10 = 4
So 5631-67-4 is a valid CAS Registry Number.
InChI:InChI=1/C9H8O3/c10-7-3-1-6-2-4-9(11)12-8(6)5-7/h1,3,5,10H,2,4H2

5631-67-4SDS

SAFETY DATA SHEETS

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

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name 7-hydroxy-3,4-dihydrochromen-2-one

1.2 Other means of identification

Product number -
Other names 7-Hydroxy-2-chromanone

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:5631-67-4 SDS

5631-67-4Relevant articles and documents

Lewis Acid Mediated Nucleophilic Substitution Reactions of 2-Alkoxy-3,4-dihydro-2H-1-benzopyrans: Regiochemistry and Utility in the Synthesis of 3,4-Dihydro-2H-1-benzopyran-2-carboxylic Acids

Cohen, Noal,Schaer, Beatrice,Saucy, Gabriel,Borer, Rene,Todaro, Louis,Chiu, Anne-Marie

, p. 3282 - 3292 (2007/10/02)

The Lewis acid mediated nucleophilic substitution reactions of a variety of 2-alkoxy-, 2-hydroxy-, and 2-(acyloxy)-3,4-dihydro-2H-1-benzopyrans (chromans) have been studied within the context of developing new synthetic routes to chroman-2-carboxylic acids, certain of which have utility as antioxidants and drug intermediates.The scope and limitations of these transformations have been determined.Treatment of 2-methoxychromans in the α-tocopherol structural class (9, 25) with cyanotrimethylsilane in the presence of TiCl4 or BF3 etherate generally leads in good yield to the desired 2-cyanochromans 10 and 26.On the other hand, ketals of the type 19 react less efficiently, giving poor to moderate yields of the cyanochromans 36 along with regioisomeric products (37, 38).Spiro-fused ketals such as 28 exhibit dichotomous behavior dependent on the Lewis acid employed, while the pyranochroman 34b affords 35 in good yield.Thus the regioselectivity of these processes appears to be highly dependent on substrate structure and the nature of the Lewis acid.

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