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81289-18-1

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81289-18-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81289-18-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,8 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 81289-18:
(7*8)+(6*1)+(5*2)+(4*8)+(3*9)+(2*1)+(1*8)=141
141 % 10 = 1
So 81289-18-1 is a valid CAS Registry Number.

81289-18-1Relevant articles and documents

A green metal-free "one-pot" microwave assisted synthesis of 1,4-dihydrochromene triazoles

Alves, Tania M. F.,Jardim, Guilherme A. M.,Ferreira, Marco A. B.

, p. 10336 - 10339 (2021/03/26)

The synthesis of several 4-aryl-1,4-dihydrochromene-triazoles was achieved via a metal-free "one-pot"procedure using PEG400 as the sole solvent in an eco-friendly process. Using microwave irradiation, the triazole derivatives were obtained in good yields and short reaction times starting from readily accessible building blocks.

Sodium Borohydride Reduction of 3-Nitro-2-substituted-phenyl-2H-benzopyrans

Arora, P. K.,Bhaduri, A. P.

, p. 951 - 954 (2007/10/02)

Reaction of 3-nitro-2-substituted-phenyl-2H-benzopyrans (1-8) with NaBH4 at 5-10 deg C followed by reduction of the nitro group with hydrazine hydrate in the presence of Raney-nickel furnishes 3-amino-2-substituted-phenyl-3,4-dihydro-2H-benzopyrans

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