I2 Promoted Synthesis of 2-Aminothiadiazoles Employing KSCN as a Sulfur Source Under Metal-Free Conditions

2019 ◽  
Vol 2019 (38) ◽  
pp. 6561-6565 ◽  
Author(s):  
Fuyuan Zhu ◽  
Zhaohua Yan ◽  
Chengmei Ai ◽  
Yanmei Wang ◽  
Sen Lin
Keyword(s):  
Sulfur Source ◽  
Metal Free

Diiiodine/Potassium Persulfate Mediated Synthesis of 1,2,3-Thiadiazoles from N-Tosylhydrazones and a Thiocyanate Salt as a Sulfur Source under Transition-Metal-Free Conditions

Synlett ◽  
2021 ◽  
Author(s):  
Yadong Sun ◽  
Ablimit Abdukader ◽  
Yuhan Lu ◽  
Chenjiang Liu
Keyword(s):  
Transition Metal ◽  
Efficient Method ◽  
Room Temperature ◽  
Functional Group ◽  
Ammonium Thiocyanate ◽  
Potassium Persulfate ◽  
Sulfur Source ◽  
Coupling Reactions ◽  
Wide Scope ◽  
Metal Free

AbstractA highly efficient method for the synthesis of 1,2,3-thiadiazoles has been developed by utilizing readily available tosylhydrazones and ammonium thiocyanate with ecofriendly EtOH as the solvent at room temperature. The reaction shows a wide scope of substrates and good functional-group tolerance. This protocol can be scaled up to a gram level and can be applied to coupling reactions with 4-(4-bromophenyl)-1,2,3-thiadiazole as the substrate.

One-pot synthesis of thioesters with sodium thiosulfate as a sulfur surrogate under transition metal-free conditions

2018 ◽  
Vol 16 (11) ◽  
pp. 1871-1881 ◽  
Author(s):  
Yen-Sen Liao ◽  
Chien-Fu Liang
Keyword(s):  
Transition Metal ◽  
Sodium Thiosulfate ◽  
Sulfur Source ◽  
One Pot ◽  
Metal Free ◽  
One Pot Synthesis

We have developed a one-pot reaction to provide thioester derivativesviasodium thiosulfate as a sulfur source under transition metal-free conditions.

Metal Free Mono- and 2,3-Bis-sulfenylation of Indoles in Water with Sodium Sulfinates as a Sulfur Source

2018 ◽  
Vol 36 (9) ◽  
pp. 819-825 ◽  
Author(s):  
Changqing Liu ◽  
Jian Fan ◽  
Manyi Wu ◽  
Jiahui Chen ◽  
Yiming Zhao ◽  
...  
Keyword(s):  
Sulfur Source ◽  
Metal Free

Metal-Free Catalytic Synthesis of Thiocarbamates Using Sodium Sulfinates as the Sulfur Source

2019 ◽  
Vol 84 (5) ◽  
pp. 2976-2983 ◽  
Author(s):  
Pengli Bao ◽  
Leilei Wang ◽  
Huilan Yue ◽  
Yun Shao ◽  
Jiangwei Wen ◽  
...  
Keyword(s):  
Catalytic Synthesis ◽  
Sulfur Source ◽  
Metal Free

scholarly journals K2S2O8-Promoted Aryl Thioamides Synthesis from Aryl Aldehydes Using Thiourea as the Sulfur Source

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2225 ◽  
Author(s):  
Yongjun Bian ◽  
Xingyu Qu ◽  
Yongqiang Chen ◽  
Jun Li ◽  
Leng Liu
Keyword(s):  
Transition Metal ◽  
Functional Groups ◽  
Sulfur Atom ◽  
Coupling Reaction ◽  
Sulfur Source ◽  
Atom Transfer ◽  
Free Condition ◽  
Metal Free ◽  
Aryl Aldehydes ◽  
Three Component Coupling

Thiourea as a sulfur atom transfer reagent was applied for the synthesis of aryl thioamides through a three-component coupling reaction with aryl aldehydes and N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMAC). The reaction could tolerate various functional groups and gave moderate to good yields of desired products under the transition-metal-free condition.

scholarly journals Brønsted acid-promoted thiazole synthesis under metal-free conditions using sulfur powder as the sulfur source

RSC Advances ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 3931-3935 ◽  
Author(s):  
Penghui Ni ◽  
Jing Tan ◽  
Rong Li ◽  
Huawen Huang ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Sulfur Source ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Sulfur Powder ◽  
Metal Free ◽  
Brönsted Acid

A Brønsted acid-promoted protocol for the synthesis of 2,4-disubstituted thiazoles from benzylamines, acetophenones, and sulfur powder under metal-free conditions is described.

Transition Metal-Free C–H Thiolation via Sulfonium Salts Using β-Sulfinylesters as the Sulfur Source

2021 ◽  
Author(s):  
Yanhui Chen ◽  
Si Wen ◽  
Qingyu Tian ◽  
Yuqing Zhang ◽  
Guolin Cheng
Keyword(s):  
Transition Metal ◽  
Sulfur Source ◽  
Sulfonium Salts ◽  
Metal Free

scholarly journals Sulphur-doped activated carbon as a metal-free catalyst for acetylene hydrochlorination

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34612-34620
Author(s):  
Xueyan Qi ◽  
Weifeng Chen ◽  
Jinli Zhang
Keyword(s):  
Activated Carbon ◽  
Sulfur Source ◽  
Acetylene Hydrochlorination ◽  
Metal Free ◽  
Spherical Activated Carbon

A series of sulfur-doped spherical activated carbon (SAC) catalysts were prepared with phenyl disulfide (C12H10S2) as a sulfur source for acetylene hydrochlorination.

DMSO as oxidant and sulfenylating agent for metal-free oxidation and methylthiolation of alcohol-containing indoles

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 30389-30393 ◽  
Author(s):  
Jin-Feng Zou ◽  
Wei-Sheng Huang ◽  
Li Li ◽  
Zheng Xu ◽  
Zhan-Jiang Zheng ◽  
...  
Keyword(s):  
Dimethyl Sulfoxide ◽  
Sulfur Source ◽  
Metal Free ◽  
Mild Conditions ◽  
Free Oxidation

A new methylthiolation protocol was successfully established for the synthesis of substituted indoles bearing 3-methylthioether moiety, in which new C–S bond and C=O bond were formed using dimethyl sulfoxide as the sulfur source under mild conditions.

The Shadow Widths of Very Small Particles are Formed Independently of the Metal Cap Build Up on the Particle

1981 ◽  
Vol 39 ◽  
pp. 568-569
Author(s):  
George C. Ruben
Keyword(s):  
Gold Particle ◽  
Film Surface ◽  
Small Particles ◽  
Geometric Process ◽  
Metal Free ◽  
Shadow Area

The formation of shadows behind small particles has been thought to be a geometric process (GP) where the metal cap build up on the particle creates a shadow width the same size as or larger than the particle. This GP cannot explain why gold particle shadow widths are generally larger than the gold particle and may have no appreciable metal cap build up (fig. 1). Ruben and Telford have suggested that particle shadow widths are formed by the width dependent deflection of shadow metal (SM) lateral to and infront of the particle. The trajectory of the deflected SM is determined by the incoming shadow angle (45°). Since there can be up to 1.4 times (at 45°) more SM directly striking the particle than the film surface, a ridge of metal nuclei lateral to and infront of the particle can be formed. This ridge in turn can prevent some SM from directly landing in the metal free shadow area. However, the SM that does land in the shadow area (not blocked by the particle or its ridge) does not stick and apparently surface migrates into the SM film behind the particle.

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