
Recent Advances in the Domain of Cyclic (Alkyl) (Amino) Carbenes
2022年1月6日 · Isolation of cyclic (alkyl) amino carbenes (cAACs) in 2005 has been a major achievement in the field of stable carbenes due to their better electronic properties. cAACs and bicyclic (alkyl) (amino)carbene (BicAAC) in essence are the most electrophilic as well as nucleophilic carbenes are known till date.
Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro …
2021年1月7日 · Transition metal catalysis that utilizes N -heterocyclic carbenes as noninnocent ligands in promoting transformations has not been well studied. We report here a cyclic (alkyl) (amino)carbene (CAAC) ligand-promoted nitro deoxygenative hydroboration with cost-effective chromium catalysis.
Preparation of Complexes Bearing N-Alkylated, Anionic or Protic …
2020年10月6日 · In contrast to the classical synthesis of CAAC complexes by deprotonation of aldiminium salts followed by CAAC coordination to a metal center, these precursors can oxidatively add to zero-valent transition metals. This procedure gives access to complexes bearing CAAC ligand with N-substituents previously unattainable.
西北大学韩英锋课题组JACS:空气/热稳定的氮杂环卡宾-碳自由基 …
2021年9月21日 · 近日,西北大学的韩英锋(点击查看介绍)团队以具有较大共轭结构的苊烯基氮杂环卡宾 (bis (imino)acenaphthene-supported N-heterocyclic carbene,IPr (BIAN) 为前驱体,成功合成了一系列高度稳定且自旋可调的碳自由基化合物。 图1. a)文献中报道的咪唑基氮杂环卡宾稳定的碳自由基;b)利用刚性配体IPr (BIAN)合成一系列稳定的单自由基,并在卡宾碳对位苯环上利用不同拉电子特性的取代基调控自由基的自旋密度分布. 自1900年Gomberg分离出首例持久 …
CAAC complexes are normally prepared from the (in situ generated) free CAAC ligands and suitable metal complexes. We became interested in the preparation of the currently unknown complexes bearing CAACs with aliphatic N1-substituents or even a proton at N1.
航空器型号和适航合格审定噪声规定
2023年3月3日 · 本规定中“亚音速运输类大飞机和亚音速喷气式飞机”是指最大起飞重量为8618公斤(19000磅)以上的螺旋桨驱动的飞机和任何类别的亚音速喷气式飞机,但在最大起飞重量下所需起飞滑跑长度不大于610米的喷气式飞机除外。 (2) 螺旋桨小飞机及螺旋桨通勤类飞机的型号合格证、补充型号合格证和改装设计批准书的颁发和更改,以及标准适航证和限用类特殊适航证的颁发。 设计用于农业作业运行和喷洒灭火材料的螺旋桨小飞机和螺旋桨通勤类飞机以及中国民用航空 …
Synthesis and Reactivity of Cyclic (Alkyl)(Amino)Carbene Stabilized ...
2017年3月22日 · The chloro complex [NiCl(η 3-H 2 C═CMe–CH 2)(cAAC methyl)] (6) was synthesized from [Ni(COD) 2] (COD = 1,5-cyclooctadiene) by consecutive treatment with allyl chloride and cAAC. The allyl halide complexes 5 and 6 are thermally labile and decompose in solution already within a few hours at room temperature.
Cyclic (Alkyl)(amino)carbenes (CAACs): Recent Developments
Discovered in 2005, cyclic (alkyl) (amino)carbenes (CAACs) are among the most nucleophilic (σ donating) and also electrophilic (π-accepting) stable carbenes known to date.
Cyclic (Alkyl) (amino)carbenes (CAACs): Recent Developments
环状(烷基)(氨基)碳烯(CAAC)于2005年被发现,是迄今为止已知的最亲核的(σ捐赠者)和亲电子的(π接受)稳定的卡宾。 这些特性使它们可以活化各种小分子和具有焓键的键,以稳定高反应性的主基团和过渡金属的反磁性和顺磁性物质,并与金属中心牢固结合,从而产生了非常坚固的催化剂。 简要总结了截至2013年底发布的最重要的结果,而本评论的大部分重点在于过去三年中报告的结果。 从最本的实验条件着手,发现新的现象。 该论文可能会对往后光催化 …
国际规章 - CAAC
中国民用航空局. 中国民航大学. 中国民航管理干部学院. 中国民航科学技术研究院. 中国民航局第二研究所. 中国航空工业集团 ...