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1643958-21-7

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1643958-21-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1643958-21-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,4,3,9,5 and 8 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1643958-21:
(9*1)+(8*6)+(7*4)+(6*3)+(5*9)+(4*5)+(3*8)+(2*2)+(1*1)=197
197 % 10 = 7
So 1643958-21-7 is a valid CAS Registry Number.

1643958-21-7Downstream Products

1643958-21-7Relevant articles and documents

Selective Synthesis of C1-Symmetric BINOL-phosphates and P-chiral Phosphoramides Using Directed ortho-Lithiation

Volpe, Rohan,Law, Hanson Y.-L.,White, Jonathan M.,Flynn, Bernard L.

, p. 7055 - 7058 (2021)

Directed ortho-lithiation (DoL) has been developed as an effective method for the ortho-substitution of BINOL-phosphoric acid and BINOL-N-triflylphosphoramide (BINOL-P-acids). It can be employed in the rapid assembly of either mono- or disubstituted BINOL-P-acids, including unsymmetrical disubstitution through iterative DoL. Most significantly, DoL has proven to be highly effective in the diastereoselective desymmetrization of pseudo-C2-symmetric BINOL-N-triflylphosphoramide, affording a chiral P-group.

Catalytic Enantioselective Nazarov Cyclization

Jolit, Anais,Dickinson, Cody F.,Kitamura, Kei,Walleser, Patrick M.,Yap, Glenn P. A.,Tius, Marcus A.

, p. 6067 - 6076 (2017/11/14)

A detailed account of an asymmetric Nazarov cyclization that leads to α-hydroxycyclopentenones bearing either vicinal, all-carbon quaternary centers, or vicinal quaternary and tertiary centers is given. The all-aliphatic examples represent the greatest challenge, as the dienone starting materials are not activated toward cyclization by an aryl group. The rational design and optimization of the substrates in parallel with optimization of the chiral Br?nsted acid catalyst is also described, as well as a series of diastereoselective transformations of a fully substituted cyclopentenone product.

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