𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Stereochemistry of the D and L copolymerization of valine N-carboxyanhydride

✍ Scribed by Toshihiro Akaike; Yukio Aogaki; Shohei Inoue

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
343 KB
Volume
14
Category
Article
ISSN
0006-3525

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

In the D and L copolymerization of valine N‐carboxyanhydride (NCA) with various D/L ratios initiated by n‐butylamine, the stereoselection of monomer NCA by the growing polymer chains, which take a β‐like conformation, does not take place. This result is in remarkable contrast to that in the D and L copolymerization of alanine NCA and of γ‐benzyl glutamate NCA where the growing α‐helical polymer chains participate in the stereoselection of the monomer antipodes.

📜 SIMILAR VOLUMES

The random copolymerization of γ-benzyl-
The random copolymerization of γ-benzyl-L-glutamate and L-valine N-carboxyanhydrides: Reactivity ratio and heteogeneity studies
✍ W. Sederel; S. Deshmane; T. Hayashi; J. M. Anderson 📂 Article 📅 1978 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 785 KB

## Abstract The random copolymerization of the __N__‐carboxyhydrides of γ‐benzyl‐L‐glutamate and L‐valine using triethylamine as the initiator in low dielectric media reults in high‐molecular‐weight copolymers at low convenrson. This behavior makes it possible to apply the monomer reactivity ration

Primary Amine and Solvent-Induced Polyme
Primary Amine and Solvent-Induced Polymerizations of L- or D,L-Phenylalanine N-Carboxyanhydride
✍ Hans R. Kricheldorf; Colin v. Lossow; Gert Schwarz 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 168 KB

## Abstract **Summary:** Benzylamine, hexylamine and aniline‐initiated polymerizations of D,L‐phenylalanine and L‐phenylalanine __N__‐carboxyanhydride (D,L‐Phe‐NCA and L‐Phe‐NCA) were performed in various solvents. The isolated polypeptides were characterized by MALDI‐TOF mass spectroscopy. Exclusi

Polymerization of L- and DL-phenylalanin
Polymerization of L- and DL-phenylalanine N-carboxyanhydride by poly(N-methyl-L-alanine)
✍ Yukio Imanishi; Kazuya Kugimiya; Toshinobu Higashimura 📂 Article 📅 1973 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 617 KB

## Abstract Polymerizations of L‐ and DL‐phenylalanine __N__‐carboxyanhydride in nitrobenzene by poly (__N__‐methyl‐L‐alanine) of varying degrees of polymerization (__n__ = 1–30) were investigated. Poly(__N__‐methyl‐L‐alanine) was prepared by the polymerization of __N__‐methyl‐L‐alanine NCA with __

Asymmetric selection in the copolymeriza
Asymmetric selection in the copolymerization of N-carboxy-L- and D-alanine anhydride
✍ Teiji Tsuruta; Shohei Inoue; Kazuo Matsuura 📂 Article 📅 1967 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 272 KB

TiAZUO AIATSUURA, Department oJ Synthetic Phfvt~isiiy, Faculty oJ Engineering, T 'niversily o j Tokyo, Bunkyo-ku, Tolip, .Japan ## Synopsis The copolymerization of N-carboxy-1,-arid o-alaniiie anhydride with methanol :ts initiator was carried out. The eiiantiomer excess in the starting monomer mi

Stereoselective synthesis of stable isot
Stereoselective synthesis of stable isotope-labeled L-α-amino acids: Electrophilic amination of Oppolzer's acyl sultams in the synthesis of L-[15N]alanine, L-[15N]valine, L-[15N]leucine, L-[15N]phenylalanine and L-[1-13C, 15N]valine
✍ Siegfried N. Lodwig; Clifford J. Unkefer 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 French ⚖ 475 KB 👁 1 views

Using 1 -chloro-l-[~~N]nitrosocyclohexane, we have prepared five L-[a-'SN]arnino acids. The stereoselective electophillic hydroxyamination of (S)-acylbornane-l0,2-suftams, followed by ZnO/H+ reduction, and alkaline cleavage of the chiral auxiliary, gave the amino acids in 97.2-99.5 % e.e. By starti

N-Chloroacyl Derivatives of Valine Ester
N-Chloroacyl Derivatives of Valine Esters
✍ V. A. Knizhnikov; V. I. Potkin; K. A. Zhavnerko; L. S. Yakubovich; S. K. Petkevi 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 26 KB