Studies of the mesomorphic behavior of bivalent carbohydrate amphiphiles
摘要:
合成了一系列由1,3-双-O-(β-D-吡喃葡萄糖基)-2-O-烷基甘油组成的同源二价糖脂,在甘油主链上带有两个糖头基团和一个烷基链。借助于偏光光学显微镜、差示扫描量热法和X射线衍射方法研究了介晶行为。同源成员表现出近晶A相,与部分双层结构一致。根据实验的 d 间距和计算得出的分子长度,表明双层结构中存在分子的部分叉指。
1-O-Alkyl (di)glycerol ethers synthesis from methyl esters and triglycerides by two pathways: catalytic reductive alkylation and transesterification/reduction
esters, monoglycerides or oleic sunflower refined oil, the corresponding 1-O-alkyl (di)glycerolethers were obtained in both high yields and selectivity by two different pathways. With methyl esters, a reductivealkylation with (di)glycerol was realized under 50 bar hydrogen pressure in the presence of 1 mol% of Pd/C and an acid co-catalyst. A second two step procedure was evaluated from methyl esters
从可用的和生物来源的甲酯中, 甘油单酸酯或油酸向日葵精制油,通过两种不同途径以高收率和选择性获得了相应的1- O-烷基(二)甘油醚。对于甲酯,在1mol%的Pd / C和酸助催化剂的存在下,在50巴的氢气压力下,实现了与(二)甘油的还原性烷基化。从甲酯或三油精 包括第一次酯交换反应成相应的 甘油单酸酯与BaO / Al 2 O 3 催化剂,然后 减少在H 2压力下,用可循环利用的非均相催化体系Pd / C和Amberlyst 35合成所需的甘油单醚。另外,还提出了反应机理。
Synthesis of Monoalkyl Glyceryl Ethers by Ring Opening of Glycidol with Alcohols in the Presence of Lewis Acids
作者:Raffaele Cucciniello、Maria Ricciardi、Rosa Vitiello、Martino Di Serio、Antonio Proto、Carmine Capacchione
DOI:10.1002/cssc.201600989
日期:2016.12.8
deals with the production of monoalkyl glyceryl ethers (MAGEs) through a new reaction pathway based on the reaction of glycidol and alcoholscatalyzed by Lewisacid‐based catalysts. Glycidol is quantitatively converted with high selectivity (99 %) into MAGEs under very mild reaction conditions (80 °C and 0.01 mol % catalyst loading) in only 1 h using Al(OTf)3 or Bi(OTf)3 as catalyst. The proposed method
Regioselective Ring‐Opening of Glycidol to Monoalkyl Glyceryl Ethers Promoted by an [OSSO]‐Fe
<sup>III</sup>
Triflate Complex
作者:Francesco Della Monica、Maria Ricciardi、Antonio Proto、Raffaele Cucciniello、Carmine Capacchione
DOI:10.1002/cssc.201901329
日期:2019.8.8
bis‐thioether‐di‐phenolate [OSSO]‐type ligand, was discovered to promote the ring‐opening of glycidol with alcohols under mild reaction conditions (0.05 mol % catalyst and 80 °C). The reaction proceeded with high activity (initial turnover frequency of 1680 h−1 for EtOH) and selectivity (>95 %) toward the formation of twelve monoalkyl glyceryl ethers (MAGEs) in a regioselective fashion (84–96 % yield of the non‐symmetric
发现具有三硫醚醚-二酚盐[OSSO]型配体的三价铁三价铁配合物可在温和的反应条件(0.05 mol%催化剂和80°C)下促进缩水甘油与醇的开环。反应以高活性(EtOH的初始周转频率为1680 h -1)进行,并以区域选择性方式(十二烷基单烷基甘油醚(MAGEs)形成)的选择性(> 95%)(非-的收率为84–96%)对称区域异构体)。这种合成方法可通过使用富含地壳的金属基催化剂将甘油衍生的平台分子(即缩水甘油)转化为高附加值的产品。
Palladium catalyst and process for producing ether
申请人:Kao Corporation
公开号:US06657089B1
公开(公告)日:2003-12-02
This invention relates to a palladium catalyst comprising a mesoporous aluminosilicate which has been treated with ammonia or a salt thereof, and palladium supported on said mesoporous aluminosilicate; and also to a process for producing an ether, which comprises reacting a cyclic acetal and hydrogen in the presence of the palladium catalyst.
Liquid crystal compounds and liquid crystal display devices
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US05275757A1
公开(公告)日:1994-01-04
Novel anti-ferroelectric liquid crystal compounds represented by the following general formula (I) and a liquid crystal display element wherein such a compound is used. ##STR1## Ph represents a phenylene group, R represents a straight-chain alkyl group having 6 to 10 carbon atoms, X represents an oxygen atom or a single bond provided that when X is an oxygen atom, L is an integer of 5 to 8, m is 1 and n is an integer of 1 to 7, or L and m are zero (0) and n is an integer of 6 to 8, and when X is a single bond, L is an integer of 5 to 8, m is 1 and n is an integer of 1 to 7, and C* represents an asymmetric carbon atom.