A novel role of zeolite NaY in the thermal reaction of alkyl aryl selenoxides in its supercages

2003 ◽  
pp. 498-499 ◽  
Author(s):  
Wanxuan Zhang ◽  
Haitao Yu ◽  
Yu Gao ◽  
Jiben Meng ◽  
Teruo Matsuura
Keyword(s):  
Thermal Reaction ◽  
Alkyl Aryl ◽  
Zeolite Nay

A Novel Role of Zeolite NaY in the Thermal Reaction of Alkyl Aryl Selenoxides in Its Supercages.

ChemInform ◽  
2003 ◽  
Vol 34 (25) ◽  
Author(s):  
Wanxuan Zhang ◽  
Haitao Yu ◽  
Yu Gao ◽  
Jiben Meng ◽  
Teruo Matsuura
Keyword(s):  
Thermal Reaction ◽  
Alkyl Aryl ◽  
Zeolite Nay

Metal-Metal Cooperative Bond Activation by Heterobimetallic Alkyl, Aryl, and Acetylide PtII/CuI Complexes

2020 ◽  
Author(s):  
Shubham Deolka ◽  
Orestes Rivada Wheelaghan ◽  
Sandra Aristizábal ◽  
Robert Fayzullin ◽  
Shrinwantu Pal ◽  
...  
Keyword(s):  
Alkyl Group ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Terminal Alkyne ◽  
Alkyl Aryl ◽  
Metal Metal ◽  
The Stability ◽  
Selective Formation ◽  
Organoplatinum Compounds

We report selective formation of heterobimetallic PtII/CuI complexes that demonstrate how facile bond activation processes can be achieved by altering reactivity of common organoplatinum compounds through their interaction with another metal center. The interaction of the Cu center with Pt center and with a Pt-bound alkyl group increases the stability of PtMe2 towards undesired rollover cyclometalation. The presence of the CuI center also enables facile transmetalation from electron-deficient tetraarylborate [B(ArF)4]- anion and mild C-H bond cleavage of a terminal alkyne, which was not observed in the absence of an electrophilic Cu center. The DFT study indicates that the role of Cu center acts as a binding site for alkyne substrate, while activating its terminal C-H bond.

Cycloadditionen, XXII [1]. Synthese und thermische Reaktion von S-(Alkyl/Aryl)- 2.3-butadienthiosäure-estern / Cycloadditions, XXII [1]. Synthesis and Thermal Reaction of S-(Alkyl/Aryl)-2,3-butadienethioates

1994 ◽  
Vol 49 (4) ◽  
pp. 542-550 ◽  
Author(s):  
Gerhard Himbert ◽  
Dieter Fink
Keyword(s):  
Alder Reaction ◽  
Thermal Reaction ◽  
Diels Alder ◽  
Alkyl Aryl ◽  
Diels Alder Reaction ◽  
Ester Moiety ◽  
Derivatives Of

While the S-alkyl- or S-phenyl-2,3-butadienethioates 4 a-c are synthesized via the usual “Wittig ylide way”, the corresponding 2-methyl-2,3-butadienethioates 9 a-d and the 2-methyl-4.4-diphenyl-2,3-butadienethioates 9 e,f are obtained by condensation of the allenic acids 7 a,b with the thiols and thiophenols 8 in the presence of dicyclohexylcarbodiimide (DCC) and a catalytic am ount of 4-dimethylaminopyridine (DMAP). In contrast to N- or O-phenyl 2,3- butadienamides or -esters, resp., the phenyl derivatives of 4 and 9 do not undergo the intram olecular Diels-Alder reaction, but by heating, all representatives of 4 only decompose, while 9 a-d and 9 e,f rearrange to 3-alkyl(aryl)thio-2-cyclobuten-1-ones 12a-d and to 3-arylthio- 1-naphthols 14a, b, resp. Heating of the cyclobutenone 12d in the presence of N-methylaniline furnishes the 2-butenanilide 16. On reacting 1-phenylthio-1-propyne 17 with diphenylketene 18, the diphenylacetate 19 is isolated, where the naphthol derivative 14a represents the ester moiety.

scholarly journals Biological Chemistry and Physiopathology of Metabolism During Fever

2019 ◽  
Vol 70 (9) ◽  
pp. 3399-3402
Author(s):  
Cristian Onisor ◽  
Dana Tutunaru ◽  
Ciprian Adrian Dinu ◽  
Camelia Ana Grigore ◽  
Ingrith Crenguta Miron ◽  
...  
Keyword(s):  
Clinical Investigation ◽  
Harmful Effect ◽  
Thermal Reaction ◽  
The Body ◽  
Infectious Agents ◽  
Biological Chemistry ◽  
General Reaction ◽  
Infectious Origin ◽  
General Rules

Physiopathology determines the causes and conditions of pathological processes, in other words, of aetiology, as well as the mechanisms of their production, namely pathogenesis; this discipline studies the general reactions of the organism, regardless of the form of the disease by which they would manifest themselves; it also studies the general rules for the occurrence and evolution of the disorders of the functions of different systems which depend on the properties of the whole organism. The tasks of physiopathology become clearer when we compare it with the tasks of the clinical investigation. Physiopathology clarifies the causes and the mechanism of the onset of a thermal reaction of the body, such as fever; the clinical part, in this case, deals with certain well-defined forms of febrile disorders, especially of infectious origin. Physiopathology studies the general rules of occurrence and development of the inflammatory process, while the clinical disciplines investigate a number of diseases caused by different forms of inflammation. Physiopathology is closely related to biology. The personal clinical study was carried out during the period 2016-2018 on a sample of 362 patients, who showed changes in the functions of different systems and organs during fever. The problem of the influence of fever, seen as a general reaction of the organism to the action of infectious agents, is of major importance in clarifying the role of fever as a reaction of adaptation in the fight of the body against infection, and it largely determines its treatment. Excessive temperature increase, as well as a sudden drop, can exert a harmful effect on the body.

Metal-Metal Cooperative Bond Activation by Heterobimetallic Alkyl, Aryl, and Acetylide PtII/CuI Complexes

2020 ◽  
Author(s):  
Shubham Deolka ◽  
Orestes Rivada Wheelaghan ◽  
Sandra Aristizábal ◽  
Robert Fayzullin ◽  
Shrinwantu Pal ◽  
...  
Keyword(s):  
Alkyl Group ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Terminal Alkyne ◽  
Alkyl Aryl ◽  
Metal Metal ◽  
The Stability ◽  
Selective Formation ◽  
Organoplatinum Compounds

We report selective formation of heterobimetallic PtII/CuI complexes that demonstrate how facile bond activation processes can be achieved by altering reactivity of common organoplatinum compounds through their interaction with another metal center. The interaction of the Cu center with Pt center and with a Pt-bound alkyl group increases the stability of PtMe2 towards undesired rollover cyclometalation. The presence of the CuI center also enables facile transmetalation from electron-deficient tetraarylborate [B(ArF)4]- anion and mild C-H bond cleavage of a terminal alkyne, which was not observed in the absence of an electrophilic Cu center. The DFT study indicates that the role of Cu center acts as a binding site for alkyne substrate, while activating its terminal C-H bond.

Role of the Metal, Ligand, and Alkyl/Aryl Group in the Hydrolysis Reactions of Group 10 Organometallic Cations [(L)M(R)]+

2013 ◽  
Vol 32 (23) ◽  
pp. 6931-6944 ◽  
Author(s):  
Matthew J. Woolley ◽  
George N. Khairallah ◽  
Gabriel da Silva ◽  
Paul S. Donnelly ◽  
Brian F. Yates ◽  
...  
Keyword(s):  
Alkyl Aryl ◽  
Aryl Group ◽  
Group 10 ◽  
Organometallic Cations ◽  
Metal Ligand ◽  
Hydrolysis Reactions

Surface photochemistry: Semiconductor mediated reactions of some saturated strained hydrocarbons

1988 ◽  
Vol 66 (7) ◽  
pp. 1579-1588 ◽  
Author(s):  
N. Colin Baird ◽  
Anthony M. Draper ◽  
Paul de Mayo
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Transfer Process ◽  
Radical Cations ◽  
Thermal Reaction ◽  
Electron Transfer Process ◽  
Electron Transfer Mechanism ◽  
Valence Isomerization ◽  
Back Electron Transfer

Quadricyclane (1) and 1,8-bishoniocubane (2) have been found to undergo valence isomerization to norborndiene and tricyclo[4.2.2.02,5]deca-3,7-diene, respectively, on illuminated CdS and ZnO. An electron transfer mechanism is proposed. Quantum yield, solvent effects, the role of oxygen, and the quenching of the reaction were investigated, and were consistent with this interpretation. The thermal reaction of 1 on CdS was also suggested to be an electron transfer process involving, in this case, defects or trapped holes on the surface of the semiconductor. An examination of a series of strained hydrocarbons structurally related to 1 (tetracyclo[3.3.0.02,8.04,6]octane 3, pentacyclo[4.3.0.02,4.03.805,7]nonane 4 and pentacyclo[4.4.0.02,4.03,8.05,7]decane 5) resulted, largely, in a demonstration of the resistance of their respective radical cations to rearrangement prior to back electron transfer. Calculations by MNDO, in combination with a modified version of MM2, were used to explore the differences in the reactivity of the radical cations of 1, 3, 4, 5, and an interpretation is presented.

Sign in / Sign up

Export Citation Format

Share Document