Synthesis of Pd<sup>II</sup> Complexes Bearing <i>p</i>NHC Ligands by Oxidative Addition of 8-Halogenotheophyllines and 8-Bromoadenine to Pd<sup>0</sup>
作者:Jonas Blumenberg、Lukas F. B. Wilm、F. Ekkehardt Hahn
DOI:10.1021/acs.organomet.0c00046
日期:2020.4.27
Various 8-halogenotheophyllines (halogen = Cl, Br, I) were selectively C8 metalated by an oxidativeaddition of the C8–halogen bond to [Pd(PPh3)4] to give the PdII azolato complexes [1]–[3]. The complexes were protonated at the N9 nitrogen atom to yield the NH,NH-NHC (pNHC) complexes [4]BF4–[6]BF4. Due to the unsymmetrical nature of the backbone of the theophylline-derived pNHC ligands, two NH resonances
Bioresorbable polymeric tubes suitable for use in a stent have been produced by a using a novel die drawing technique.
通过使用一种新颖的模具拉伸技术,生产出了适用于支架的生物可吸收聚合物管。
Method of producing a tube for use in the formation of a stent, and such tube
申请人:Arterius Limited
公开号:US10299944B2
公开(公告)日:2019-05-28
Bioresorbable polymeric tubes suitable for use in a stent have been produced by a using a die drawing technique, comprising: —deforming an orientable, thermoplastic polymer tubing (4) in the solid phase by drawing it over a mandrel (1) and/or through a die (3), where the mandrel (1) has a lead end and an exit end and the die (3) has an entry side and an exit side, wherein a drawing mechanism applies a drawing tension to the tubing (4) from the exit end of the mandrel (1) and/or the exit side of the die (3), said tension being insufficient to cause tensile failure of the tubing but sufficient to deform the tubing, thereby drawing the tubing over the mandrel (1) and/or through the die (3) in the solid phase to induce uniaxial or biaxial orientation of the polymer; and —collecting the deformed tubing from the exit end of the mandrel (1) and/or the exit side of the die (3).