Novel Metal-Free Hydrogenation of the Carbon−Carbon Double Bond in Azulenoid Enones by Use of Cycloheptatriene and Protic Acid

2006 ◽  
Vol 8 (14) ◽  
pp. 3137-3139 ◽  
Author(s):  
Takatomo Kimura ◽  
Tohru Takahashi ◽  
Mitsuko Nishiura ◽  
Kimiaki Yamamura
Keyword(s):  
Double Bond ◽  
Metal Free ◽  
Carbon Double Bond

scholarly journals Chemoselective and metal-free reduction of α,β-unsaturated ketones by in situ produced benzeneselenol from O-(tert-butyl) Se-phenyl selenocarbonate

RSC Advances ◽  
2020 ◽  
Vol 10 (56) ◽  
pp. 33706-33717
Author(s):  
Andrea Temperini ◽  
Marco Ballarotto ◽  
Carlo Siciliano
Keyword(s):  
Double Bond ◽  
Hydrochloric Acid ◽  
Unsaturated Ketones ◽  
Metal Free ◽  
Tert Butyl ◽  
Carbon Double Bond

The carbon–carbon double bond of arylidene acetones and chalcones can be selectively reduced with benzeneselenol generated in situ by reacting O-(tert-butyl) Se-phenyl selenocarbonate with hydrochloric acid in ethanol.

scholarly journals Novel Metal-Free Hydrogenation of the Carbon—Carbon Double Bond in Azulenoid Enones by Use of Cycloheptatriene and Protic Acid.

ChemInform ◽  
2006 ◽  
Vol 37 (46) ◽  
Author(s):  
Takatomo Kimura ◽  
Tohru Takahashi ◽  
Mitsuko Nishiura ◽  
Kimiaki Yamamura
Keyword(s):  
Double Bond ◽  
Metal Free ◽  
Carbon Double Bond

scholarly journals Metal-free hydroarylation of the side chain carbon–carbon double bond of 5-(2-arylethenyl)-3-aryl-1,2,4-oxadiazoles in triflic acid

2017 ◽  
Vol 13 ◽  
pp. 883-894 ◽  
Author(s):  
Anna S Zalivatskaya ◽  
Dmitry S Ryabukhin ◽  
Marina V Tarasenko ◽  
Alexander Yu Ivanov ◽  
Irina A Boyarskaya ◽  
...  
Keyword(s):  
Double Bond ◽  
Dft Calculations ◽  
Side Chain ◽  
Triflic Acid ◽  
Metal Free ◽  
Nmr Data ◽  
Carbon Double Bond

The metal-free reaction of 5-(2-arylethenyl)-3-aryl-1,2,4-oxadiazoles with arenes in neat triflic acid (TfOH, CF3SO3H), both under thermal and microwave conditions, leads to 5-(2,2-diarylethyl)-3-aryl-1,2,4-oxadiazoles. The products are formed through the regioselective hydroarylation of the side chain carbon–carbon double bond of the starting oxadiazoles in yields up to 97%. According to NMR data and DFT calculations, N4,C-diprotonated forms of oxadiazoles are the electrophilic intermediates in this reaction.

Reactions of 4-Pyrones with Azomethine Ylides as a Chemo­selective Method for the Construction of Multisubstituted Pyrano[2,3-c]pyrrolidines

Synthesis ◽  
2021 ◽  
Author(s):  
Dmitrii L. Obydennov ◽  
Vyacheslav D. Steben’kov ◽  
Konstantin L. Obydennov ◽  
Sergey A. Usachev ◽  
Vladimir S. Moshkin ◽  
...  
Keyword(s):  
Double Bond ◽  
Ring Opening ◽  
Azomethine Ylides ◽  
Azomethine Ylide ◽  
Dipolar Cycloaddition ◽  
Computational Studies ◽  
Carbon Double Bond ◽  
Reactivity Indexes ◽  
Reaction Proceeds

Abstract4-Pyrones bearing electron-donating and electron-withdrawing groups react with nonstabilized azomethine ylides to form pyrano[2,3-c]pyrrolidines in moderate to good yields. The reaction proceeds chemoselectively as a 1,3-dipolar cycloaddition of the azomethine ylide at the carbon–carbon double bond of the pyrone activated by the electron-withdrawing substituent. The reactivity of 4-pyrones toward azomethine ylides was rationalized by computational studies with the use of reactivity indexes. The pyrano[2,3-c]pyrrolidine moiety could be modified, for example by a ring-opening transformation under the action of hydrazine to provide pyrazolyl-substituted pyrrolidines.

Cycloaddition reactions across the carbon-carbon double bond of thiirene 1,1-dioxide

1984 ◽  
Vol 49 (7) ◽  
pp. 1300-1302 ◽  
Author(s):  
Mitsuo Komatsu ◽  
Yasuo Yoshida ◽  
Masatoshi Uesaka ◽  
Yoshiki Ohshiro ◽  
Toshio Agawa
Keyword(s):  
Double Bond ◽  
Cycloaddition Reactions ◽  
Carbon Double Bond

ChemInform Abstract: Electrooxidative Fission of Carbon-Carbon Double Bond in a K2OsO2(OH)4/ HIO4 Double Mediatory System.

ChemInform ◽  
2010 ◽  
Vol 27 (5) ◽  
pp. no-no
Author(s):  
H. TANAKA ◽  
R. KIKUCHI ◽  
M. BABA ◽  
S. TORII
Keyword(s):  
Double Bond ◽  
Carbon Double Bond

Unusual carboncarbon double bond cleavage in thiophenohomotropone system promoted by ethanedithiol

1982 ◽  
Vol 23 (28) ◽  
pp. 2859-2862 ◽  
Author(s):  
Bernard Hanquet ◽  
Mohammed El Borai ◽  
Roger Guilard ◽  
Yves Dusausoy
Keyword(s):  
Double Bond ◽  
Bond Cleavage ◽  
Carbon Double Bond

Raman Spectra of Polyisoprene Rubbers

1970 ◽  
Vol 43 (2) ◽  
pp. 313-321 ◽  
Author(s):  
S. W. Cornell ◽  
J. L. Koenig
Keyword(s):  
Double Bond ◽  
Raman Spectra ◽  
Structure Type ◽  
Peak Height ◽  
Mixed Structure ◽  
Carbon Double Bond

Abstract The Raman spectra of cis-1,4-, trans-1,4-, and 3,4-polyisoprene are presented, and the frequencies are classified by configurational structure type. The stretching frequency of the carbon-carbon double bond vibrations are used to describe structure content. Only Raman bands characteristic of total 1,4 content and total vinyl content can be observed. Tentative values of structure content determined by both peak height and peak area are presented for two mixed structure rubbers.

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