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19991-68-5

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19991-68-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19991-68-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,9,9 and 1 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 19991-68:
(7*1)+(6*9)+(5*9)+(4*9)+(3*1)+(2*6)+(1*8)=165
165 % 10 = 5
So 19991-68-5 is a valid CAS Registry Number.

19991-68-5SDS

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 3-formylthiophene-2-carboxylic acid

1.2 Other means of identification

Product number -
Other names 3-formyl-2-thiophenecarboxylic acid

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:19991-68-5 SDS

19991-68-5Relevant articles and documents

Litvinov et al.

, (1976)

The Scope and Limitations of Carboxamide-Induced β-Directed Metalation of 2-Substituted Furan, Thiophene, and 1-Methylpyrrole Derivatives Application of the Method of Syntheses of 2,3-Disubstituted Thiophenes and Furans

Carpenter, Andrew J.,Chadwick, Derek J.

, p. 4362 - 4368 (2007/10/02)

The effects of change of solvent, metalating agent, reaction time, and reaction temperature on the lithiation of N,N-diethylthiophene-2-carboxamide and of the N-tert-butyl-2-carboxamide derivatives of furan, thiophene, and 1-methylpyrrole are explored, and optimum conditions are established for ring β-directed metalation.The tertiary carboxamido group is less effective in this context than the secondary amide function and appears to be of limited value in these heteroaromatic systems.The high metalation levels achievable with the furan and thiophene secondary amides allow high-yielding syntheses (through reaction of the lithiated intermediates with a wide range of electrophiles) of otherwise inaccessible 2,3-disubstituted derivatives.The synthetical value of the methodology appears to be limited only by the forcing conditions required for amide hydrolysis.

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