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1620989-71-0

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1620989-71-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1620989-71-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,2,0,9,8 and 9 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1620989-71:
(9*1)+(8*6)+(7*2)+(6*0)+(5*9)+(4*8)+(3*9)+(2*7)+(1*1)=190
190 % 10 = 0
So 1620989-71-0 is a valid CAS Registry Number.

1620989-71-0Relevant articles and documents

ABC-type meso-triaryl-substituted subporphyrins

Yoshida, Kota,Mori, Hirotaka,Tanaka, Takayuki,Mori, Tadashi,Osuka, Atsuhiro

, p. 3997 - 4004 (2014/07/08)

ABC-Type subporphyrins 5a-5h, which bear three different meso-aryl substituents, were rationally synthesized by condensation of AB-type tripyrranes and aroyl chlorides. ABC-Type subporphyrins 5i and 5j were synthesized by Pd-catalyzed amination reaction of 4-bromophenyl subporphyrins 5e and 5h, respectively. Comparative studies on these ABC-type subporphyrins with A 3-type subporphyrins and A2B-type subporphyrins revealed that substituent effects are mostly simple superpositions of individual substituents but cooperative effects are recognized for subporphyrins which bear both electron-donating and electron-withdrawing substituents. Despite extensive attempts, enantiomeric separation of B-methoxy ABC-type subporphyrins was unsuccessful, whereas B-phenylated ABC-type subporphyrins were separated to pure enantiomers. Separated enantiomers showed weak but distinct CD signals reflecting the chiral clockwise/anticlockwise arrangements of the meso-aryl substituents. These results suggest facile racemization through S N1-type heterolysis of the B-OMe bond in solution. ABC-Type meso-triaryl-substituted subporphyrins were rationally synthesized. Cooperative substituent effects are noted for donor-acceptor-type subporphyrins. Although the chiral resolution has not been successful for B-methoxy ABC-type subporphyrins, the enantiomers of some B-phenyl subporphyrins have been resolved by using chiral HPLC. Copyright

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