Coupling of Trifluoroacetaldehyde <i>N</i>-Triftosylhydrazone with Organoboronic Acids for the Synthesis of <i>gem</i>-Difluoroalkenes
作者:Yu Ma、Bhoomireddy Rajendra Prasad Reddy、Xihe Bi
DOI:10.1021/acs.orglett.9b03740
日期:2019.12.20
synthesis of alkyl gem-difluoroalkenes remains a difficult task in organic synthesis. Here, we report a general and efficient approach for tackling this problem by gem-difluoroolefination of trifluoroacetaldehyde N-triftosylhydrazone with organoboronic acids. This protocol is operationally simple, free of transition metals, and suitable for a broad range of organoboronic acids. Moreover, the utility
Self-Directed Orientation of Molecular Columns Based on n-Type Hexaazatrinaphthylenes (HATNAs) for Electron Transport
作者:Xu-Ying Liu、Takayuki Usui、Junichi Hanna
DOI:10.1002/chem.201403472
日期:2014.10.27
Self‐organizing n‐type hexaazatrinaphthylenes (HATNAs) with various bay‐located side chains have been synthesized. The HATNA derivatives are able to form long‐range molecular columns with self‐directed growth directions. In particular, alkyl‐substituted HATNAs showed in‐plane molecular columns with axes parallel to substrates, whereas the columnar orientation of the HATNAs with alkylethynyl or alkylthio
已经合成了具有各种位于海湾位置的侧链的自组织n型六氮杂萘(HATNA)。HATNA衍生物能够形成具有自定向生长方向的远程分子柱。尤其是,烷基取代的HATNA的面内分子列的轴平行于底物,而带有烷基乙炔基或烷硫基的HATNA的柱状取向在很大程度上取决于引入的侧链的长度。有趣的是,具有辛硫基链的衍生物表现出面外分子列,其中电子迁移率高达10 -3 cm 2 V -1 s -1 是通过飞行时间技术确定的,突出了这样一个事实,即基于海湾取代的HATNA的分子柱是有希望用于设备应用的n型半导体。
METHOD TO IMPROVE COLD FLOW RESISTANCE OF POLYMERS
申请人:Hogan Terrence E.
公开号:US20100036026A1
公开(公告)日:2010-02-11
A method for reducing the cold flow of a polymeric composition of matter by introducing polymer with the combination or reaction product of (i) an acetal or ketal of an alditol and (ii) (a) a hydrocarbylated boric acid, (b) an organoaluminum compound, or (c) both a hydrocarbylated boric acid and an organoaluminum compound.