A utility for organoleads: selective alkyl and aryl group transfer to tin

2018 ◽  
Vol 47 (5) ◽  
pp. 1703-1708 ◽  
Author(s):  
Renzo N. Arias-Ugarte ◽  
Keith H. Pannell
Keyword(s):  
Molar Ratio ◽  
Aryl Group ◽  
Group Transfer

Me4Pb and Ph4Pb readily transfer methyl or phenyl groups to an equivalent molar ratio of tin(iv) chlorides in the order SnCl4 > MeSnCl3 > Me2SnCl2 > Me3SnCl, often in a selective manner.

scholarly journals Gold-Catalyzed C-S Aryl-Group Transfer in Zinc Finger Proteins

2018 ◽  
Vol 130 (30) ◽  
pp. 9449-9453 ◽  
Author(s):  
Raphael E. F. de Paiva ◽  
Zhifeng Du ◽  
Douglas H. Nakahata ◽  
Frederico A. Lima ◽  
Pedro P. Corbi ◽  
...  
Keyword(s):  
Zinc Finger ◽  
Zinc Finger Proteins ◽  
Aryl Group ◽  
Group Transfer

Palladium-Catalyzed Aryl Group Transfer from Triarylphosphines to Arylboronic Acids

Polyhedron ◽  
2021 ◽  
pp. 115550
Author(s):  
Purna C.R. Vasireddy ◽  
Akash R. Gogate ◽  
Dale R. Enright ◽  
Irina P. Smoliakova
Keyword(s):  
Aryl Group ◽  
Group Transfer ◽  
Arylboronic Acids ◽  
Palladium Catalyzed

Si−C Bond Activation of ArMe2SiOH Promoted by a Bromoplatinum(II) Complex and Ag2O. Aryl Group Transfer from Silicon to Platinum

2001 ◽  
Vol 20 (6) ◽  
pp. 1243-1246 ◽  
Author(s):  
Neli Mintcheva ◽  
Yasushi Nishihara ◽  
Makoto Tanabe ◽  
Kazunori Hirabayashi ◽  
Atsunori Mori ◽  
...  
Keyword(s):  
Bond Activation ◽  
Aryl Group ◽  
Group Transfer

scholarly journals Copolymers incorporated with β-substituted acrylate synthesized by organo-catalyzed group-transfer polymerization

2021 ◽  
Author(s):  
Motosuke Imada ◽  
Yasumasa Takenaka ◽  
Takeharu Tsuge ◽  
Hideki Abe
Keyword(s):  
Acid Catalyst ◽  
Mechanical Analysis ◽  
Proton Nuclear Magnetic Resonance ◽  
Butyl Methacrylate ◽  
Molar Ratio ◽  
Thermal Stabilities ◽  
Group Transfer ◽  
H Nmr ◽  
Flight Mass Spectrometry ◽  
Silicon Based

AbstractVarious copolymers incorporated with β-substituted acrylates, such as alkyl crotonates (e.g., methyl crotonate (MC), ethyl crotonate (EC), isopropyl crotonate (iPC), and n-butyl crotonate (nBC)) and methyl cinnamate (MCin), were synthesized by group-transfer polymerization (GTP) using a silicon-based Lewis acid catalyst. In addition to β-substituted acrylates, α-substituted acrylates (e.g., methyl methacrylate (MMA) and n-butyl methacrylate (nBMA)) were examined as comonomers. Proton nuclear magnetic resonance (1H NMR) spectroscopy and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) characterizations of the obtained copolymers revealed that each monomer component was incorporated sufficiently. The thermal stabilities of the resulting copolymers were investigated by dynamic mechanical analysis (DMA), indicating that the glass-transition temperature (Tg) of the copolymers can be widely varied over a relatively high-temperature range by selecting the optimal comonomer. More specifically, the Tg values of poly(MC-random-EC) (MC/EC molar ratio = 50/50), poly(MC-random-nBC) (MC/nBC molar ratio = 50/50), poly(MC-random-MCin) (MC/MCin molar ratio = 54/46), and poly(nBC-random-MCin) (nBC/MCin molar ratio = 56/44) were 173, 130, 216, and 167 °C, respectively.

Mechanism of ipso aromatic substitution by reaction of aryloxy(methoxy)carbenes and diaryloxycarbenes with DMAD

2001 ◽  
Vol 79 (4) ◽  
pp. 364-369 ◽  
Author(s):  
Xiaosong Lu ◽  
John Warkentin
Keyword(s):  
Electron Transfer ◽  
Aromatic Ring ◽  
Nucleophilic Attack ◽  
Side Chain ◽  
Dimethyl Acetylenedicarboxylate ◽  
Aromatic Substitution ◽  
Aryl Group ◽  
Group Transfer

Some aryloxy(methoxy)carbenes and diaryloxycarbenes attack dimethyl acetylenedicarboxylate (DMAD) with aryl group transfer to an alkyne carbon of DMAD. In this study diaryloxycarbenes with different aryl groups that could be transferred competitively, were generated in the presence of DMAD to probe for the mechanism of that ipso aromatic substitution. It was found that a para electron-withdrawing substituent, relative to an electron-donating substituent, facilitated migration of an aryl group. Mechanisms in accord with these findings involve initial nucleophilic attack by the carbene at an alkyne carbon of DMAD. That step is followed by either nucleophilic, ipso attack on the aromatic ring or by electron transfer, from the side chain of the aromatic ring into the ring itself.Key words: aromatic substitution, diaryloxycarbene, DMAD, ipso, nucleophilic.

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