Recent Progress in the Use of Vilsmeier-Type Reagents

Su, Weike; Weng, Yiyi; Jiang, Ling; Yang, Yanyan; Zhao, Linyao; Chen, Zhiwei; Li, Zhenhua; Li, Jianjun

doi:10.1080/00304948.2010.513911

Cited by 58 publications

(27 citation statements)

References 184 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

mentioning

confidence: 99%

“…For preparation of these chalcones we have initially synthesized two already known methyl ketones I [11] and II [12], after that a thiophene fragment was introduced into their structure. At the first stage of the synthesis the Vilsmeier-Haak-Arnold reaction was carried out to prepare compounds III and IV, their cyclization with chloroacetone in the presence of Na 2 S afforded methyl ketones V and VI used further as methylene components in the synthesis of chalcones [11,13,14].Refluxing of the obtained methyl ketones V and VI with 4-(10N-phenothiazin-10-yl)-and 4-(9N-carbazol-9-yl)benzaldehydes VII and VIII in the alkaline alcohol solution gave rise to the target chalcones IX-XII. Thus prepared chalcones are the dark red or orange crystalline substances, well soluble in common organic solvents, and their solutions in dichloromethane possess a pronounced yellow and yellow-green fluorescence, and in hexane -a blue one.…”

mentioning

confidence: 99%

See 1 more Smart Citation

New thiophene- and phenothiazine-containing chalcones: Synthesis, and electrochemical properties

et al. 2014

View full text Add to dashboard Cite

Among the conjugated systems used in design of electronic devices based on organic materials the derivatives of carbazole and phenothiazine occupy are of key importance due to their high thermal stability, hole conductivity and light emission in various spectral regions when used in OLEDs and electrochromic devices, and to hole conductivity [1][2][3][4]. Phenothiazine contains electron-rich atoms N and S atoms, possesses a low oxidation potential, and is capable to form stable cation-radicals. The unique electronic and optical characteristics of phenothiazine proceed from its nonplanar geometry providing thereby the possibility to obtain π-packed aggregates and intermolecular excimers [5]. It has been established in our previous research that chalcones prepared on the base of carbazole, phenothiazine, and their substituted derivatives appeared to be good for creation of electrochromic polymer films [6][7][8]. It is also known that chalcones containing various aromatic fragments in their structure possess nonlinear optical properties indispensable for creation of optoelectronic devices, like electro-optic modulators, optical switches, lightemitting sources, etc. [9, 10]. Therefore it is expedient to synthesize new chalcone series including in their structure various carbo-and heterocyclic fragments and to examine their physicochemical properties, first, from the viewpoint of using them for preparation of polymer compounds, and second from the standpoint of tuning their electronic and optical characteristics by modifying the chemical structure.In this study there is presented the synthesis and the investigation of physicochemical properties of chalcones IX-XII (see the scheme) containing conjugation chains formed by combinations of various carbo-and heterocyclic fragments. For preparation of these chalcones we have initially synthesized two already known methyl ketones I [11] and II [12], after that a thiophene fragment was introduced into their structure. At the first stage of the synthesis the Vilsmeier-Haak-Arnold reaction was carried out to prepare compounds III and IV, their cyclization with chloroacetone in the presence of Na 2 S afforded methyl ketones V and VI used further as methylene components in the synthesis of chalcones [11,13,14].Refluxing of the obtained methyl ketones V and VI with 4-(10N-phenothiazin-10-yl)-and 4-(9N-carbazol-9-yl)benzaldehydes VII and VIII in the alkaline alcohol solution gave rise to the target chalcones IX-XII. Thus prepared chalcones are the dark red or orange crystalline substances, well soluble in common organic solvents, and their solutions in dichloromethane possess a pronounced yellow and yellow-green fluorescence, and in hexane -a blue one. UV absorption and fluorescence spectra of compounds V, VI and IX-XII were recorded for their solutions in chloroform. Stokes shifts were estimated from the data of absorption and emission spectra. On the basis of the value of the longest absorption wavelength (λ onset ) the width of the forbidden band gap (E g opt ) was calculated [15...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

New thiophene- and phenothiazine-containing chalcones: Synthesis, and electrochemical properties

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The Vilsmeier Haack (VH) reaction [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] is widely used for formylation. It can be applied to introduce an acetyl group on activated aromatic or hetero aromatic compounds, many other conversions can be achieved with this technology.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonically Assisted Synthesis of Aromatic Sulfonic Acids under Vilsmeier Haack Conditions in Acetonitrile Medium

Rajanna¹,

Venkanna²,

Kumar³

et al. 2012

IJOC

View full text Add to dashboard Cite

Sulfonation of aromatic compounds (Phenols, Anilines) is triggered by Vilsmeier Haack (VH) reagent (DMF/POCl 3) or (DMF/SOCl 2) in the presence of NaHSO 3 under Sonication and conventional stirred conditions at room temperature. The reactions afforded corresponding Sulfonic acid derivatives in very good yields. The results obtained under Sonication were enhanced when compared with the yields of the conventional method.

show abstract

“…Also, the VilsmeierHaack reagent reacts rapidly with various alkens, carbonyl compounds, compounds which containing active methyl and methylene groups and O-and N-containing nucleophiles (Marston , 1992 ;Su et al , 2010 ).…”

Section: Introductionmentioning

confidence: 99%