Methoxydifluoromethyl Isocyanate by Thermal Cleavage of a Diazetidine

1960 ◽  
Vol 82 (4) ◽  
pp. 852-853 ◽  
Author(s):  
J. C. Kauer ◽  
A. K. Schneider
Keyword(s):  
Thermal Cleavage

Recent advances in Minisci-type reactions and applications in organic synthesis

2020 ◽  
Vol 24 ◽  
Author(s):  
Wengui Wang ◽  
Shoufeng Wang
Keyword(s):  
Free Radical ◽  
Hydrogen Atom ◽  
Organic Synthesis ◽  
Radical Reactivity ◽  
Atom Loss ◽  
Radical Generation ◽  
In Situ Generation ◽  
Thermal Cleavage ◽  
Synthetic Chemist

Abstract:: Minisci-type reactions have become widely known as reactions that involve the addition of carbon-centered radicals to basic heteroarenes followed by formal hydrogen atom loss. While the originally developed protocols for radical generation remain in active use today, in recent years by a new array of radical generation strategies allow use of a wider variety of radical precursors that often operate under milder and more benign conditions. New transformations based on free radical reactivity are now available to a synthetic chemist looking to utilize a Minisci-type reaction. Radical-generation methods based on photoredox catalysis and electrochemistry, which utilize thermal cleavage or the in situ generation of reactive radical precursors, have become popular approaches. Our review will cover the remarkably literature that has appeared on this topic in recent 5 years, from 2015-01 to 2020-01, in an attempt to provide guidance to the synthetic chemist, on both the challenges that have been overcome and applications in organic synthesis.

Recent Advances in the Synthesis of Polyfluorenes as Organic Semiconductors

2004 ◽  
Vol 814 ◽  
Author(s):  
David J. Brennan ◽  
Yu Chen ◽  
Shaoguang Feng ◽  
James P. Godschalx ◽  
Gary E. Spilman ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Semiconductor Film ◽  
Melting Temperatures ◽  
Alternating Copolymers ◽  
Polymeric Semiconductor ◽  
Recent Advances ◽  
Thermal Cleavage ◽  
Switching Characteristics ◽  
Initial Results ◽  
Bottom Gate

AbstractNew poly(fluorene-thiophene) alternating copolymers are described in which either the dioctylfluorene or bithiophene units in poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) are replaced by other fluorene or thiophene-based groups, respectively. Improvements in solubility are realized when the bithiophene unit of F8T2 is replaced by dihexylterthiophene or dihexylpentathiophene units. Melting temperatures are also lowered by 50 – 100°C in these polymers when compared to F8T2. Replacement of the bithiophene unit of F8T2 with a dihexylpentathiophene unit also results in a significant improvement in hysteresis (< 2 V vs. 3.5 – 5 V for F8T2). Initial results are also reported on the thermal cleavage of the C8 side groups of F8T2, which yields an insoluble polymeric semiconductor film that continues to exhibit transistor switching characteristics as part of a bottom gate device.

scholarly journals A latent pigment strategy for robust active layers in solution-processed, complementary organic field-effect transistors

2017 ◽  
Vol 5 (44) ◽  
pp. 11522-11531 ◽  
Author(s):  
Isis Maqueira-Albo ◽  
Giorgio Ernesto Bonacchini ◽  
Giorgio Dell'Erba ◽  
Giuseppina Pace ◽  
Mauro Sassi ◽  
...  
Keyword(s):  
Small Molecule ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Solution Processing ◽  
Organic Field Effect Transistors ◽  
Solution Processed ◽  
Active Layers ◽  
Thermal Cleavage

A latent pigment approach enables solution-processing of small molecule films that are insoluble in aggressive solvents upon thermal cleavage of solubilizing groups.

The addition of organometallic reagents to tetramesityldigermene

2002 ◽  
Vol 80 (11) ◽  
pp. 1387-1392 ◽  
Author(s):  
Kyle L Fujdala ◽  
David W.K Gracey ◽  
Erica F Wong ◽  
Kim M Baines
Keyword(s):  
Ligand Exchange ◽  
Grignard Reagent ◽  
Thermal Conditions ◽  
Grignard Reagents ◽  
Ethylmagnesium Bromide ◽  
Organometallic Reagent ◽  
Organometallic Reagents ◽  
Thermal Cleavage

The thermolysis and photolysis of hexamesitylcyclotrigermane in the presence of ethylmagnesium bromide has been investigated. Under photochemical conditions, ethyldimesitylgermane, 1,2-diethyl-1,1,2-trimesityldigermane and ethyl-1,1,2,2-tetramesityldigermane were isolated and, under thermal conditions, 1,2,2-triethyl-1,1-dimesityl digermane and 2,2-diethyl-1,1,1-trimesityldigermane were isolated. The photolysis of hexamesitylcyclotrigermane in the presence of methyllithium has also been investigated. In both cases, the organometallic reagent adds to tetramesityl digermene and dimesitylgermylene formed by photochemical or thermal cleavage of the cyclotrigermane. In the case of the addition of the Grignard reagent, the resulting germyl Grignard reagent undergoes a facile ligand exchange reaction.Key words: digermene, germylene, Grignard reagents, alkyllithium reagents, germylmagnesium compounds, germyllithium compounds.

Additionen an die Si=N-Doppelbindung – Kristallstruktur eines (SiNCO)-Vierringes / Additions to the Si=N-Double Bond - Crystal Structure of a (SiNCO)-Four Membered Ring

1991 ◽  
Vol 46 (6) ◽  
pp. 709-713 ◽  
Author(s):  
Susanne Vollbrecht ◽  
Uwe Klingebiel ◽  
Dieter Schmidt-Bäse
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Single Crystals ◽  
Membered Ring ◽  
Thermal Cleavage

In the reaction with benzophenone and phenylaldehyde lithiated aminofluorosilanes behave like iminosilanes. Four membered rings are formed in (2+2) cycloadditions. The oxaazasilacyclobutane ((CMe3)2Si—NCMe3—C6H5CH—O—) was purified by destillation. Single crystals were obtained by recrystallization from hexane. The thermal cleavage of the (SiNCO)-rings leads to carboimines and cyclosiloxanes. The lithium derivate of di-tert-butylfluorosilyl-2.6-diisopropylphenylamine reacts with 2-methyl-propenal-2 in two competing ways. In a (2+4) cycloaddition an 1-oxa-3-aza-2-sila-5-cyclohexene is formed, and in a (2+2) cycloaddition 2-methyl-2-propenyl-N-(2.6-diisopropylphenyl)imine is generated via an (SiNCO)-ring intermediate.

Pyrolysis of Esters. IV. Thermal Cleavage of the Cyclobutane Ring1

1955 ◽  
Vol 77 (10) ◽  
pp. 2787-2790 ◽  
Author(s):  
William J. Bailey ◽  
Carl H. Cunov ◽  
Louis Nicholas
Keyword(s):  
Thermal Cleavage
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