The Synthesis of α, ω-Disubstituted Higher Alkanes from α, α, α, ω-Tetrachloroalkanes
作者:Kazuo Saotome、Hiroshi Komoto、Toshiaki Yamazaki
DOI:10.1246/bcsj.39.480
日期:1966.3
methods of the hydrolysis of α, α, α, ω-tetrachloroalkanes. The reactions were carried out in fuming nitric acid, with the addition of nitrogen dioxide during the reaction or in the presence of a small amount of phosphoric anhydride. α, ω-Dichloroalkanes were derived from the ω-chloroalkanoic acids by the Kolbe electrolytic synthesis. Various other novel α, ω-disubstituted alkanes with very long methylene
BIOABSORBABLE POLYMERS FROM BIOABSORBABLE POLYISOCYANATES AND USES THEREOF
申请人:Bezwada Rao S.
公开号:US20090292029A1
公开(公告)日:2009-11-26
Novel bioabsorbable and/or biocompatible polyurethanes, polyureas, polyamideurethanes and polyureaurethanes with tunable physical, mechanical properties and hydrolytic degradation profiles are provided for use in biomedical applications such as stents, stent coatings, scaffolds, foams, and films. The disclosed polymers may be derived from biocompatible and/or bioabsorbable polyisocyanates. The present invention also relates to new and improved methods for the preparation of the biocompatible and/or bioabsorbable polyisocyanates.
Permethylated α-CD-based rotaxanes with short alkylene chains as an axle were synthesized through urea end-capping in one pot: Products were [2]rotaxane and [3]rotaxane. The head-to-head structure of [3]rotaxane obtained as a single isomer was confirmed by the characteristic 1H NMR peak shifts and X-ray single-crystal structure analysis.
Diamines for Polymer Materials via Direct Amination of Lipid- and Lignocellulose-based Alcohols with NH<sub>3</sub>
作者:Dennis Pingen、Judith B. Schwaderer、Justus Walter、Jiaqi Wen、George Murray、Dieter Vogt、Stefan Mecking
DOI:10.1002/cctc.201800365
日期:2018.7.19
catalytic directamination of long‐chain diols, derived from plant oils. High conversion was achieved with good selectivity, with the amount of nitrile impurities formed suppressed to a low level. From the lignocellulose‐based 5‐hydroxymethylfurfural (5‐HMF), or from bis(hydroxymethyl)furan, 2,5‐bis(aminomethyl)furan (BAMF) was generated. 5‐HMF was converted in a one‐pot, one‐step directamination and reductive
Dynamic Rotational Motions of Vaulted Chiral
<i>trans</i>
‐Bis(salicylaldiminato)palladium(II) Complexes Bearing Rigid or Flexible Carbon Chain Linkers
作者:Masahiro Ikeshita、Takeshi Naota
DOI:10.1002/ejic.201800666
日期:2018.11.25
trans‐bis(salicylaldiminato)palladium(II) complexes having a macrocyclic vaulting structure consisting of either a heptamethylene‐butadiynylene‐heptamethylene (1) or polymethylene (2) bridge were synthesized and subsequently characterized by NMR, IR, high‐resolution mass spectrometry, and single crystal XRD. The dynamic rotational behaviors of these vaultedcomplexes resulting from a skipping‐rope‐like molecular