✦ LIBER ✦

Synthesis and conformational study of poly(0,0′-dicarbobenzoxy-L-β-3,4-dihydroxyphenyl-α-alanine)

✍ Scribed by Hiroyuki Yamamoto; Tadao Hayakawa

Publisher: Wiley (John Wiley & Sons)
Year: 1977
Tongue: English
Weight: 618 KB
Volume: 16
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1977.360160717

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

High‐molecular‐weight poly(0,0′‐dicarbobenzoxy‐L‐β‐3,4‐dihydroxyphenyl‐α‐alanine) was prepared by the N‐carboxyanhydride method. From the results obtained by a study of the optical rotation, nuclear magnetic resonance, and solution infrared absorption, the conformation of poly(0,0′‐dicarbobenzoxy‐L‐β‐3,4‐dihydroxyphenyl‐α‐alanine) depended greatly on the solvent taking a right‐handed helix with [θ]~225~ = −13,600 ∼ −18,900 in alkyl halides, a left‐handed helix with [θ]~228~ = 22,100 ∼ 24,800 in cyclic ethers or trimethylphosphate, and a random coil structure in dichloroacetic acid, trifluoroacetic acid, or hexafluoroacetone sesquihydrate. The polypeptide underwent a right‐handed helix‐coil transition in chloroform/dichloroacetic acid (or trifluoroacetic acid) mixed solvents and a left‐handed helix‐coil transition in dioxane/dichloroacetic acid (or trifluoroacetic acid) mixed solvents. The results were compared with those of poly(0‐carbobenzoxy‐L‐tyrosine).

📜 SIMILAR VOLUMES

Synthesis of sequential polypeptides con

Synthesis of sequential polypeptides containing L-β-3,4-dihydroxyphenyl-α-alanine (DOPA) and L-lysine

✍ Hiroyuki Yamamoto; Tadao Hayakawa 📂 Article 📅 1982 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 781 KB

## Abstract Six different sequential polypeptides with the repeating units L‐lysyl‐L‐DOPA, L‐DOPA‐L‐lysine, L‐lysyl‐L‐lysyl‐L‐DOPA, L‐DOPA‐L‐DOPA‐L‐lysine, L‐lysyl‐L‐lysyl‐L‐lysyl‐L‐DOPA, and L‐DOPA‐L‐DOPA‐L‐DOPA‐L‐lysine have been synthesized by solution polymerization of the __p__‐nitrophyenyl es

Synthesis of sequential polypeptides con

Synthesis of sequential polypeptides containing L-β-3,4-dihydroxyphenyl-α-alanine (DOPA) and L-glutamic acid

✍ Hiroyuki Yamamoto; Tadao Hayakawa 📂 Article 📅 1979 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 551 KB

## Abstract Sequential polypeptides with the repeating units L‐glutamyl‐L‐DOPA, L‐DOPA‐L‐glutamyl‐L‐DOPA, L‐glutamyl‐L‐glutamyl‐L‐DOPA, L‐DOPA‐L‐DOPA‐L‐glutamyl‐L‐DOPA, and L‐glutamyl‐L‐glutamyl‐L‐glutamyl‐L‐DOPA have been synthesized by solution polymerization of the __p__‐nitrophenyl esters of th

Synthesis and conformational studies of

Synthesis and conformational studies of alternating poly(β-para-nitrobenzyl-L-aspartate-β-benzyl-L-aspartate), a right-handed/left-handed α-helix-type conformation

✍ Jean-Pierre Aubert; Marie-H. Loucheux-Lefebvre 📂 Article 📅 1975 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 266 KB 👁 1 views

An Efficient Synthesis of Bicyclo[3.3.0]

An Efficient Synthesis of Bicyclo[3.3.0]oct-2-en-4-ones and 2-Azabicyclo[3.3.0]oct-7-en-6-ones via β-Amino-Substituted α,β-Unsaturated Fischer Carbene Complexes

✍ Heiko Schirmer; Frank J. Funke; Stephan Müller; Mathias Noltemeyer; Bernard L. F 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 234 KB 👁 1 views

An Efficient Synthesis of Bicyclo[3.3.0]oct-2-en-4-ones and 2-Azabicyclo[3.3.0]oct

ChemInform Abstract: An Efficient Synthe

ChemInform Abstract: An Efficient Synthesis of Bicyclo[3.3.0]oct-2-en-4-ones and 2-Azabicyclo[3.3.0]oct-7-en-6-ones via β-Amino-Substituted α,β-Unsaturated Fischer Carbene Complexes.

✍ Heiko Schirmer; Frank J. Funke; Stephan Mueller; Mathias Noltemeyer; Bernard L. 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 43 KB 👁 2 views

Sn-K and Pb-L3 EXAFS, X-Ray Diffraction,

Sn-K and Pb-L3 EXAFS, X-Ray Diffraction, and 119Sn Mössbauer Spectroscopic Studies of Ordered β-PbSnF4 and Disordered Pb1-xSnxF2 (x = 0.3, 0.4) Solid Solutions and PbSn4F10: High Performance Fluoride Ion Conductors

✍ G. Denes; Y.H. Yu; T. Tyliszczak; A.P. Hitchcock 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 545 KB