scholarly journals Visible-light Mediated Ring Opening Reaction of Alkylidenecyclopropanes for the Generation of Homopropargyl Radical

2021 ◽  
Author(s):  
Xiao-Yu Zhang ◽  
Chao Ning ◽  
Ben Mao ◽  
Yin Wei ◽  
Min Shi
Keyword(s):  
Molecular Structure ◽  
Visible Light ◽  
Ring Opening ◽  
Mechanistic Studies ◽  
Radical Process ◽  
Ring Opening Reaction ◽  
Long Time ◽  
Radical Clock

Classical cyclopropylcarbinyl radical clock reactions have been widely applied to conduct the mechanistic studies on probing radical process for a long time; however, alkylidenecyclopropanes, which have a similar molecular structure...

Synthesis of 2,2-difluoro-homoallylic alcohols via ring-opening of gem-difluorocyclopropane and aerobic oxidation by photo-irradiation in the presence of an organic pigment

2018 ◽  
Vol 16 (33) ◽  
pp. 6106-6114 ◽  
Author(s):  
Hiroaki Takenaka ◽  
Yoshihiro Masuhara ◽  
Kent Narita ◽  
Toshiki Nokami ◽  
Toshiyuki Itoh
Keyword(s):  
Visible Light ◽  
Ring Opening ◽  
Aerobic Oxidation ◽  
Organic Dye ◽  
Organic Pigment ◽  
Homoallylic Alcohols ◽  
Ring Opening Reaction

The aerobic oxidation took place after the visible light-mediated ring-opening reaction of gem-difluorocyclopropane in the presence of an organic dye and amine to furnish 2,2-difluoro-homoallylic alcohols in good yields.

Preparation, Characterization and Application of Siloxane Succinate Fatliquor

2011 ◽  
Vol 233-235 ◽  
pp. 292-297 ◽  
Author(s):  
Tao Tao Qiang ◽  
Xiang Luo ◽  
Long Fang Ren ◽  
Xue Chuan Wang ◽  
Bao Yuan He
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Castor Oil ◽  
Ring Opening ◽  
Rapeseed Oil ◽  
Raw Materials ◽  
Decomposition Temperature ◽  
Thermal Decomposition Temperature ◽  
Dyeing Property ◽  
Ring Opening Reaction

The silicone succinate surfactant (PMPS) was synthesized by ring-opening reaction using polyether alcohol amine modified polysilosane (PAPS) with maleic anhydride (MA) as the raw materials, and p-toluenesulfonic acid (PTSA) was used as the catalyst. Sulfated castor oil and sulfated rapeseed oil were combinated with PMPS to prepare a new leather fatliqour (PMPSF) composed mainly of PMPS. The molecular structure of PMPS was characterized by FTIR spectra; the thermal properties of PMPS was characterized and analyzed by TGA. PMPSF was used in sheepskin wet blue leather and compared with oxidative sulfited vegetable oils (L-3) and RF-1 fatliquor; the waterproof and mechanical properties of the leather were measured. The results show that the thermal decomposition temperature of PMPS is 192.8°C. Fatliquor PMPSF provids a good level-dyeing property, the leather oiled by it has good flexibility and fullness, the waterproofness and mechanical properties of leather are also good. Moreover, compared with the leather fatliquored by L-3, the thickening rate of leather oiled by PMPSF reaches 13.7%.

scholarly journals Ring-Opening Fluorination of Bicyclic Azaarenes

2021 ◽  
Author(s):  
Masayuki Komatsuda ◽  
Ayane Suto ◽  
Hiroki Kondo Jr. ◽  
Hiroyuki Takada ◽  
Kenta Kato ◽  
...  
Keyword(s):  
Functional Groups ◽  
Aromatic Ring ◽  
Ring Opening ◽  
Mechanistic Studies ◽  
Electrophilic Fluorination ◽  
Ring Opening Reaction ◽  
Tertiary Carbon

We have discovered a ring-opening fluorination of bicyclic azaarenes. Upon treatment of bicyclic azaarenes such as pyrazolopyridines with electrophilic fluorinating agents, fluorination of the aromatic ring is followed by a ring-opening reaction. Although this overall trans-formation can be classified as an electrophilic fluorination of an aromatic ring, it is a novel type of fluorination that results in construction of tertiary carbon–fluorine bonds. The present protocol can be applied to a range of bicyclic azaarenes, tolerating azines and a variety of functional groups. Additionally, mechanistic studies and enantioselective fluorination have been examined.

scholarly journals Ring-Opening Fluorination of Bicyclic Azaarenes

2021 ◽  
Author(s):  
Masayuki Komatsuda ◽  
Ayane Suto ◽  
Hiroki Kondo Jr. ◽  
Hiroyuki Takada ◽  
Kenta Kato ◽  
...  
Keyword(s):  
Functional Groups ◽  
Aromatic Ring ◽  
Ring Opening ◽  
Mechanistic Studies ◽  
Electrophilic Fluorination ◽  
Ring Opening Reaction ◽  
Tertiary Carbon

We have discovered a ring-opening fluorination of bicyclic azaarenes. Upon treatment of bicyclic azaarenes such as pyrazolopyridines with electrophilic fluorinating agents, fluorination of the aromatic ring is followed by a ring-opening reaction. Although this overall trans-formation can be classified as an electrophilic fluorination of an aromatic ring, it is a novel type of fluorination that results in construction of tertiary carbon–fluorine bonds. The present protocol can be applied to a range of bicyclic azaarenes, tolerating azines and a variety of functional groups. Additionally, mechanistic studies and enantioselective fluorination have been examined.

Photocatalytic Degradation of Carbaryl over Novel MWNT-TiO2 Nanocomposite under Visible Light Irradiation

2011 ◽  
Vol 233-235 ◽  
pp. 476-480
Author(s):  
Ke Dai ◽  
Hai Bo Chen ◽  
Xu Li ◽  
Hao Chen ◽  
Qiao Yun Huang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Ring Opening ◽  
Uv Light ◽  
Light Irradiation ◽  
Photodegradation Efficiency ◽  
Uv Light Irradiation ◽  
Ring Opening Reaction ◽  
Visible Light Driven ◽  
Direct Growth

The MWNT-TiO2nanocomposite was synthesized via direct growth of TiO2nanoparticles on the surface of the functionalized MWNTs by the hydrothermal treatment and utilized as the photocatalyst in the carbaryl degradation under both visible light and UV light irradiation. Visible-light-driven activity and enhanced UV-light-driven activity are both achieved as the composite MWNTs with TiO2can efficiently enhance the light absorption and charge separation and then photocatalytic activity. The photodegradation efficiency of carbaryl was examined by HPLC and IC techniques, which demonstrates that carbaryl can be readily degraded under visible light irradiation. Based on the obtained experimental results, assisted with the computer simulation of carbaryl molecule on PM3 level, it is presumed that the degradation of carbaryl starts with the break of N21-C23 and C19-N21 bonds and ends in the generation of naphthalen-1-ol before the ring-opening reaction.

scholarly journals Ein monocyclisches Phosphoran mit axial gebundenem Wasserstoff: Darstellung und Molekülstruktur / A Monocyclic Phosphorane with Hydrogen in Axial Position: Preparation and Molecular Structure

1985 ◽  
Vol 40 (11) ◽  
pp. 1593-1596 ◽  
Author(s):  
Gerd-Volker Röschenthaler ◽  
Rainer Bohlen ◽  
Dietmar Schomburg
Keyword(s):  
Molecular Structure ◽  
Dimethyl Sulfoxide ◽  
Structure Analysis ◽  
Ring Opening ◽  
Axial Position ◽  
X Ray ◽  
Ring Opening Reaction

Chlorodiphenylphosphane and triethylammonium perfluoropinacolate yield the monocyclic hydrophosphorane 3. The X-ray structure analysis reveals that hydrogen is bonded in the axial position of a trigonal bipyramide. With dimethyl sulfoxide 3 undergoes a ring opening reaction to give phosphinate 5.

Visible Light-Promoted Catalytic Ring-Opening Isomerization of 1,2-Disubstituted Cyclopropanols to Linear Ketones

2019 ◽  
Author(s):  
Marharyta V. Laktsevich-Iskryk ◽  
Nastassia A. Varabyeva ◽  
Volha V. Kazlova ◽  
Vladimir N. Zhabinskii ◽  
Vladimir A. Khripach ◽  
...  
Keyword(s):  
Visible Light ◽  
Functional Groups ◽  
Ring Opening ◽  
Radical Intermediates ◽  
Reaction Proceeds

In this article, we report a photocatalytic protocol for the isomerization of 1,2-disubstituted cyclopropanols to linear ketones. The reaction proceeds <i>via</i> radical intermediates and tolerates various functional groups.

Visible Light-Promoted Catalytic Ring-Opening Isomerization of 1,2-Disubstituted Cyclopropanols to Linear Ketones

2019 ◽  
Author(s):  
Marharyta V. Laktsevich-Iskryk ◽  
Nastassia A. Varabyeva ◽  
Volha V. Kazlova ◽  
Vladimir N. Zhabinskii ◽  
Vladimir A. Khripach ◽  
...  
Keyword(s):  
Visible Light ◽  
Functional Groups ◽  
Ring Opening ◽  
Radical Intermediates ◽  
Reaction Proceeds

In this article, we report a photocatalytic protocol for the isomerization of 1,2-disubstituted cyclopropanols to linear ketones. The reaction proceeds <i>via</i> radical intermediates and tolerates various functional groups.

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