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5558-55-4

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5558-55-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5558-55-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,5,5 and 8 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 5558-55:
(6*5)+(5*5)+(4*5)+(3*8)+(2*5)+(1*5)=114
114 % 10 = 4
So 5558-55-4 is a valid CAS Registry Number.

5558-55-4Relevant articles and documents

Phenanthrene Synthesis by Palladium(II)-Catalyzed γ-C(sp2)-H Arylation, Cyclization, and Migration Tandem Reaction

Gou, Bo-Bo,Yang, Hui,Sun, Huai-Ri,Chen, Jie,Wu, Junliang,Zhou, Ling

, p. 80 - 84 (2019)

Phenanthrene is an important structural motif in chemistry and materials science, and many synthetic routes have been developed to construct its skeleton. However, synthesis of unsymmetric phenanthrenes remains a challenge. Here, an efficient one-pot tandem reaction for the preparation of phenanthrenes via sequential γ-C(sp2)-H arylation, cationic cyclization, dehydration, and 1,2-migration was developed. A wide range of symmetric and unsymmetric phenanthrenes with diversified functional groups were synthesized with good to excellent yields.

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