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175789-29-4

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175789-29-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 175789-29-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,5,7,8 and 9 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 175789-29:
(8*1)+(7*7)+(6*5)+(5*7)+(4*8)+(3*9)+(2*2)+(1*9)=194
194 % 10 = 4
So 175789-29-4 is a valid CAS Registry Number.

175789-29-4Upstream product

175789-29-4Relevant articles and documents

Chiral N-dienyl-L-pyroglutamic esters in asymmetric hetero-Diels-Alder reactions with acylnitroso dienophiles

Behr, Jean-Bernard,Defoin, Albert,Pires, Joaquim,Streith, Jacques,Macko, Ludwig,Zehnder, Margaretha

, p. 3283 - 3302 (1996)

Asymmetric Diels-Alder reaction of the N-dienyl-L-pyroglutamic esters 1a-h with acyl nitroso dienophiles 4a-h gave diastereoisomeric adducts 6a-n, 7a-n with 12-90% de, depending on solvents and temperature. An interpretation was given. The 'allylic effect' (π(C=C) - σ*(N-C) MO interactions) was found to be effective to account for the conformations of the adducts.

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