A simple and efficient synthesis of 9-arylfluorenes via metal-free reductive coupling of arylboronic acids and N-tosylhydrazones in situ

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63726-63731 ◽  
Author(s):  
Xu Shen ◽  
Ningning Gu ◽  
Ping Liu ◽  
Xiaowei Ma ◽  
Jianwei Xie ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Reductive Coupling ◽  
Efficient Synthesis ◽  
Metal Free ◽  
Arylboronic Acids

A general, yet efficient synthesis method of 9-arylfluorenes via metal-free reductive coupling of N-tosylhydrazones and arylboronic acids has been developed.

ChemInform Abstract: A Simple and Efficient Synthesis of 9-Arylfluorenes via Metal-Free Reductive Coupling of Arylboronic Acids and N-Tosylhydrazones in situ.

ChemInform ◽  
2015 ◽  
Vol 46 (52) ◽  
pp. no-no
Author(s):  
Xu Shen ◽  
Ningning Gu ◽  
Ping Liu ◽  
Xiaowei Ma ◽  
Jianwei Xie ◽  
...  
Keyword(s):  
Reductive Coupling ◽  
Efficient Synthesis ◽  
Metal Free ◽  
Arylboronic Acids

An Efficient Synthesis of Substituted Pyrazoles from One-Pot Reaction of Ketones, Aldehydes, and Hydrazine Monohydrochloride

Synlett ◽  
2018 ◽  
Vol 29 (08) ◽  
pp. 1071-1075 ◽  
Author(s):  
Vit Lellek ◽  
Cheng-yi Chen ◽  
Wanggui Yang ◽  
Jie Liu ◽  
Xuebao Ji ◽  
...  
Keyword(s):  
Efficient Synthesis ◽  
One Pot ◽  
Metal Free ◽  
Mild Conditions ◽  
Free Process ◽  
One Pot Condensation ◽  
Substituted Pyrazoles

An efficient, one-pot and metal-free process for the preparation of 3,5-disubstituted and 3,4,5-trisubstituted pyrazoles on multi-gram scale was developed. One-pot condensation of ketones, aldehydes and hydrazine monohydrochloride readily formed pyrazoline intermediates under mild conditions. Oxidation of pyrazolines, in situ, employing bromine afforded a wide variety of pyrazoles. The methodology offers a fast, and often chromatography-free protocol for the synthesis of 3,4,5-substituted pyrazoles in good to excellent yields. Alternatively, a more benign oxidation protocol affords 3,5-disubstituted or 3,4,5-trisubstituted pyrazoles by simply heating pyrazolines in DMSO under oxygen.

One-Pot Synthesis of Triarylmethanes via Metal-Free Reductive Coupling of Diaryl Ketones, Tosylhydrazide, and Arylboronic Acids

2016 ◽  
Vol 34 (10) ◽  
pp. 1033-1038 ◽  
Author(s):  
Xu Shen ◽  
Ningning Gu ◽  
Ping Liu ◽  
Xiaowei Ma ◽  
Jianwei Xie ◽  
...  
Keyword(s):  
Reductive Coupling ◽  
One Pot ◽  
Metal Free ◽  
Arylboronic Acids ◽  
One Pot Synthesis

Metal-free Reductive Coupling of Biphenyl Tosylhydrazones with Phenols or Benzyl Alcohols

2017 ◽  
Vol 14 (10) ◽  
Author(s):  
Yang Liu ◽  
Ping Liu ◽  
Yan Liu ◽  
Yu Wei ◽  
Bin Dai
Keyword(s):  
Reductive Coupling ◽  
Benzyl Alcohols ◽  
Metal Free

Metal-free oxidative cyclization of trifluoroacetimidohydrazides with methylhetarenes: a facile access to 3-hetaryl-5-trifluoromethyl-1,2,4-triazoles

2021 ◽  
Author(s):  
Xiao-Feng Wu ◽  
Zhengkai Chen ◽  
Jiajun Zhang ◽  
Tian-Hui Xu
Keyword(s):  
Oxidative Cyclization ◽  
Efficient Synthesis ◽  
Metal Free

A metal-free oxidative cyclization of trifluoroacetimidohydrazides with methylhetarenes for the efficient synthesis of 3-hetaryl-5-trifluoromethyl-1,2,4-triazoles has been developed. Notable features of this protocol include readily accessible starting materials, a broad substrate...

scholarly journals Converting copper sulfide to copper with surface sulfur for electrocatalytic alkyne semi-hydrogenation with water

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yongmeng Wu ◽  
Cuibo Liu ◽  
Changhong Wang ◽  
Yifu Yu ◽  
Yanmei Shi ◽  
...  
Keyword(s):  
Binding Energy ◽  
Noble Metal ◽  
Atomic Hydrogen ◽  
Copper Sulfide ◽  
Low Cost ◽  
Water Electrolysis ◽  
Metal Free ◽  
Copper Nanowire

AbstractElectrocatalytic alkyne semi-hydrogenation to alkenes with water as the hydrogen source using a low-cost noble-metal-free catalyst is highly desirable but challenging because of their over-hydrogenation to undesired alkanes. Here, we propose that an ideal catalyst should have the appropriate binding energy with active atomic hydrogen (H*) from water electrolysis and a weaker adsorption with an alkene, thus promoting alkyne semi-hydrogenation and avoiding over-hydrogenation. So, surface sulfur-doped and -adsorbed low-coordinated copper nanowire sponges are designedly synthesized via in situ electroreduction of copper sulfide and enable electrocatalytic alkyne semi-hydrogenation with over 99% selectivity using water as the hydrogen source, outperforming a copper counterpart without surface sulfur. Sulfur anion-hydrated cation (S2−-K+(H2O)n) networks between the surface adsorbed S2− and K+ in the KOH electrolyte boost the production of active H* from water electrolysis. And the trace doping of sulfur weakens the alkene adsorption, avoiding over-hydrogenation. Our catalyst also shows wide substrate scopes, up to 99% alkenes selectivity, good reducible groups compatibility, and easily synthesized deuterated alkenes, highlighting the promising potential of this method.

scholarly journals Metal-free porous phosphorus-doped g-C3N4 photocatalyst achieving efficient synthesis of benzoin

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12682-12686
Author(s):  
Yuanjin Li ◽  
Shuhui Wang ◽  
Jin Wu ◽  
Qiuyan Wang ◽  
Changqiu Ma ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Conversion Rate ◽  
Oxygen Activation ◽  
Superoxide Radicals ◽  
Efficient Synthesis ◽  
Metal Free ◽  
Phosphorus Doped

Porous phosphorus-doped g-C3N4 (PCNT) has intensive oxygen activation ability to generate superoxide radicals, and can efficiently catalyze synthesis of benzoin from benzyl alcohol, with conversion rate and selectivity near to 100%.

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