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214475-40-8

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214475-40-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 214475-40-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,4,4,7 and 5 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 214475-40:
(8*2)+(7*1)+(6*4)+(5*4)+(4*7)+(3*5)+(2*4)+(1*0)=118
118 % 10 = 8
So 214475-40-8 is a valid CAS Registry Number.

214475-40-8Relevant academic research and scientific papers

Structural insight into the aggregation of l-prolyl dipeptides and its effect on organocatalytic performance

Berdugo, Cristina,Escuder, Beatriu,Miravet, Juan F.

, p. 592 - 600 (2014)

NMR and organocatalytic studies of four dipeptides derived from l-proline are described. Results indicate that important conformational changes around the catalytic l-proline moiety are observed for free dipeptides upon changing the adjacent amino acid. Also, an aggregation process is detected as the concentration increases. The self-association of the dipeptides has been fitted to a cooperative binding model. All the compounds have been assayed as catalysts for the conjugated addition of cyclohexanone to trans-β-nitrostyrene in toluene. In agreement with the structural studies, noticeable changes in the catalytic performance are detected upon changing the catalyst concentration, as the catalyst is activated by self-aggregation. This journal is

Mechanistic insight into the lability of the benzyloxycarbonyl (Z) group in N-protected peptides under mild basic conditions

Tena-Solsona, Marta,Angulo-Pachon, Cesar A.,Escuder, Beatriu,Miravet, Juan F.

, p. 3372 - 3378 (2014/06/09)

An unexpected lability of the benzyloxycarbonyl (Z) protecting group under mild basic conditions at room temperature is explained by a mechanism based on anchimeric assistance. It is found that the vicinal amide group stabilises the tetrahedral intermediate formed after nucleophilic addition of hydroxide to the carbonyl of the Z group. This effect operates in N-protected tripeptides and tetrapeptides but Z-protected dipeptides are stable under the same conditions due to blockage of the vicinal amide NH by intramolecular H-bonding with the terminal carboxylate moiety. Copyright

Synthesis of chiral tropopodands having l-amino acid moieties and ability of their metal complexes as an asymmetric catalyst

Sato, Ohki,Koshiba, Yusuke,Sagara, Satoshi,Okada, Katsuyoshi

, p. 529 - 533 (2007/10/03)

Optical active tropopodans (10 and 11) having neutral l-amino acids and l-histidine moieties were synthesized. Within their metal complexes, Pd complexes of histidine-tropopodands (11b and 11c) bearing bulky amide moieties showed good ability as an asymmetric catalyst in conjugate addition.

Nickel complexes from α-amino amides as efficient catalysts for the enantioselective Et2Zn addition to benzaldehyde

Burguete, M. Isabel,Collado, Manuel,Escorihuela, Jorge,Galindo, Francisco,García-Verdugo, Eduardo,Luis, Santiago V.,Vicent, María J.

, p. 6891 - 6894 (2007/10/03)

Ni2+ complexes derived from simple α-amino amides catalyze very efficiently the addition of Et2Zn to benzaldehyde, giving (S)-1-phenylethanol as the major isomer in most cases (94% yield, 97% ee for R=Bn). The nature of the substituent on the amide nitrogen atom seems to play a key role in determining the asymmetric induction observed.

Aryl hydrazides as linkers for solid phase synthesis which are cleavable under mild oxidative conditions

Millington, Christopher R.,Quarrell, Rachel,Lowe, Gordon

, p. 7201 - 7204 (2007/10/03)

We have developed an acid/base stable aryl hydrazide linker which is readily coupled to solid phase resins. Cleavage is specific and facile, requiring a copper (II) catalyst, base and a nucleophile to proceed. The conditions are compatible with all 20 proteinogenic amino acids and quantitative cleavage is achieved within 2 hours at 20°C to give peptides with C-terminal acid, amide or ester functionalities. Aryl hydrazides also offer scope as simple 'traceless' linkers.

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