超越自然界所能产生的分子多样性的扩展是化学科学的基本目标。尽管含硼杂环的化学性质很丰富,但以六元B 3 NO 2核为特征的1,3-二氧杂-5-氮杂-2,4,6-三硼烷(DATB)环系统仍然难以捉摸。在这里,我们报告m的合成-三联苯基为模板的DATB衍生物,由于三个适当排列的硼原子而显示出高稳定性和奇特的Lewis酸度。我们确定了羧酸和胺的脱水酰胺化中DATB的特殊用途,该反应具有很高的学术和工业重要性。与先前报道的催化剂和酰胺偶联剂的作用机理相反,提出了三个硼位参与底物组装,降低了过渡态的熵成本。由DATB核心决定的独特的机理途径不仅会促进这种酰胺化反应,还会促进由多位点激活引起的其他反应。
DATB derivatives, displaying high stability and peculiar Lewis acidity arising from the three suitably arranged boron atoms. We identify a particular utility for DATB in the dehydrative amidation of carboxylic acids and amines, a reaction of high academic and industrial importance. The three boron sites are proposed to engage in substrate assembly, lowering the entropic cost of the transition state,
超越自然界所能产生的分子多样性的扩展是化学科学的基本目标。尽管含硼杂环的化学性质很丰富,但以六元B 3 NO 2核为特征的1,3-二氧杂-5-氮杂-2,4,6-三硼烷(DATB)环系统仍然难以捉摸。在这里,我们报告m的合成-三联苯基为模板的DATB衍生物,由于三个适当排列的硼原子而显示出高稳定性和奇特的Lewis酸度。我们确定了羧酸和胺的脱水酰胺化中DATB的特殊用途,该反应具有很高的学术和工业重要性。与先前报道的催化剂和酰胺偶联剂的作用机理相反,提出了三个硼位参与底物组装,降低了过渡态的熵成本。由DATB核心决定的独特的机理途径不仅会促进这种酰胺化反应,还会促进由多位点激活引起的其他反应。
Palladium-Catalyzed Benzofulvenation of<i>o</i>-Arylanilines through C−H Bond Activation by Using Two Diarylacetylenes as an Implicit Benzofulvene
novel, simple, and efficient approach for the synthesis of benzofulvene derivatives from o‐arylaniline substrates through C−H bond activation with two diarylacetylenes as an implicit benzofulvene unit. The reactivity of synthesized benzofulvenes toward oxidation was investigated, and they were shown to transform into phenanthridines, oxabenzofulvenes, and fluorescent polycyclics.
A 1,2‐Addition Pathway for C(sp
<sup>2</sup>
)−H Activation at a Dinickel Imide
作者:Ian G. Powers、Cholpisit Kiattisewee、Kimberly C. Mullane、Eric J. Schelter、Christopher Uyeda
DOI:10.1002/chem.201701855
日期:2017.6.7
A dinickel imido complex was synthesized using a redox‐active naphthyridine‐diimine supporting ligand. Upon coordination of an external ligand, the Ni2 core was disrupted, triggering an aromatic C−H activation reaction to generate a Ni2(μ‐NHAr)(Ar) species. This intermediate is capable of liberating free carbazole and phenanthridine products upon heating or treatment with excess tBuNC. Collectively
Provided are organometallic compounds including a ligand L
A
of
Also provided are formulations including these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.