Liquid crystal naphthalene compounds, represented by the following formula (1) are disclosed.
R-Z-A-#-NAP-Z′-R′ (1)
In the formula (1), R is an alkyl group containing 1 to 18 carbon atoms; R′ is an alkyl group containing 1 to 21 carbon atoms; NAP represents 2,6-naphthylene group;# represents C≡C;
A, Z and Z′ are as follows: 1) A is Pyr> and
(a) Z is - and Z′ is O or COO or (b) Z is OCO and Z′ is - or O; 2) A is FPhF and (a) Z is - or O and Z′ is -, O or COO or (b) Z is OCO and Z′ is - or O; 3) A is FPh and (a) Z is - and Z′ is O or COO, (b) Z is O and Z′ is -, O or COO or (c) Z is OCO and Z′ is - or O; 4) A is
揭示了液晶萘化合物,其表示为以下公式(1):R-Z-A-#-NAP-Z′-R′ (1)
在公式(1)中,R是含有1至18个碳原子的烷基基团;R′是含有1至21个碳原子的烷基基团;NAP代表2,6-萘基团;#代表C≡C;A,Z和Z′如下:
1)A是Pyr>,并且(a)Z是-,Z′是O或COO,或者(b)Z是OCO,Z′是-或O;
2)A是FPhF,并且(a)Z是-或O,Z′是-,O或COO,或者(b)Z是OCO,Z′是-或O;
3)A是FPh,并且(a)Z是-,Z′是O或COO,或者(b)Z是O,Z′是-,O或COO,或者(c)Z是OCO,Z′是-或O;
4)A是
The first vinyl acetate mediated organocatalytic transesterification of phenols: a step towards sustainability
作者:Manoj Kumar、Sourav Bagchi、Anuj Sharma
DOI:10.1039/c5nj01436k
日期:——
The present report outlines our efforts toward a simple yet elegant protocol for O-acylation of a wide variety of phenols. This highly enabling and solventless method relies on vinyl acetate as an innocuous acyl donor and DABCO as an organocatalyst. Operational simplicity, excellent yields, higher and faster conversion rates without excess reagents, a simple workup and essentially no need of columns
本报告概述了我们为简单而优雅的方案进行的各种酚O酰化的努力。这种高度可行且无溶剂的方法依赖于乙酸乙烯酯作为无害的酰基供体,而DABCO作为有机催化剂。操作简便,出众的收率,更高和更快的转化率而无需使用过多的试剂,简单的后处理以及基本上不需要色谱柱,这些都是所报告方案的重要特征。
POLYCARBONATE RESIN COMPOSITION, MOLDED ARTICLE, POLYCARBONATE RESIN, AND END-CAPPING AGENT FOR POLYCARBONATE RESIN
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:US20200115496A1
公开(公告)日:2020-04-16
A polycarbonate resin composition, a molded article, a polycarbonate resin, and an end-capping agent for polycarbonate resins are provided. The polycarbonate resin composition contains: a polycarbonate resin having a terminal structure represented by Formula (A) and having a viscosity average molecular weight from 1×10
4
to 5×10
4
, and a stabilizer. In Formula (A), R
1
is selected from the group consisting of a hydrogen atom, halogen atoms, linear alkyl groups having from 1 to 9 carbons, branched alkyl groups having from 3 to 9 carbons, linear alkenyl groups having from 2 to 9 carbons, branched alkenyl groups having from 3 to 9 carbons, and aryl groups having from 6 to 12 carbons; and R
2
to R
7
are each independently selected from the group consisting of a hydrogen atom, alkyl groups having from 1 to 9 carbons, and alkoxy groups having from 1 to 9 carbons.
提供聚碳酸酯树脂组合物、成型品、聚碳酸酯树脂和聚碳酸酯树脂封端剂。聚碳酸酯树脂组合物包含:具有由式(A)表示的末端结构和粘度平均分子量为1×104到5×104的聚碳酸酯树脂,以及稳定剂。在式(A)中,R1选择自氢原子、卤素原子、具有1到9个碳原子的直链烷基、具有3到9个碳原子的支链烷基、具有2到9个碳原子的直链烯基、具有3到9个碳原子的支链烯基和具有6到12个碳原子的芳基组成的群;而R2到R7分别独立地选择自氢原子、具有1到9个碳原子的烷基和具有1到9个碳原子的烷氧基组成的群。
Nickel-Catalyzed Cross-Electrophile Coupling Reactions for the Synthesis of <i>gem</i>-Difluorovinyl Arenes
作者:Baojian Xiong、Ting Wang、Haotian Sun、Yue Li、Søren Kramer、Gui-Juan Cheng、Zhong Lian
DOI:10.1021/acscatal.0c03993
日期:2020.11.20
A nickel-catalyzed cross-electrophile coupling reaction between (hetero)aryl bromides and 2,2-difluorovinyl tosylate is presented. This protocol provides facile incorporation of the gem-difluorovinyl moiety in organic molecules. The method features mild reaction conditions, good functional group tolerance, and excellent yields. Furthermore, mechanistic experiments and DFT studies indicate a Ni(0)/Ni(II)
提出了镍催化的(杂)芳基溴化物与2,2-二氟乙烯基甲苯磺酸酯之间的亲电子交联反应。该方案提供了在有机分子中宝石-二氟乙烯基部分的容易掺入。该方法具有温和的反应条件,良好的官能团耐受性和优异的收率。此外,机理实验和DFT研究表明Ni(0)/ Ni(II)催化循环,因此不同于当前接受的镍催化的C(sp 2)–C(sp 2)亲电子偶联反应的催化循环。
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