Direct Catalytic Benzene Hydroxylation under Mild Reaction Condition by Using a Monocationic μ-Nitrido-Bridged Iron Phthalocyanine Dimer with 16 Peripheral Methyl Groups

2022 ◽  
Author(s):  
Yasuyuki Yamada ◽  
Chee-Ming Teoh ◽  
Yuka Toyoda ◽  
Kentaro Tanaka
Keyword(s):  
Acetonitrile Solution ◽  
Methyl Groups ◽  
Iron Phthalocyanine ◽  
Reaction Conditions ◽  
Reaction Condition ◽  
Hydroxylation Of Benzene ◽  
Benzene Hydroxylation

Direct catalytic hydroxylation of benzene under mild reaction conditions proceeded efficiently in the presence of a monocationic μ-nitrido-bridged iron phthalocyanine dimer with 16 peripheral methyl groups in an acetonitrile solution...

Halogenation of Butyl Rubber—A Model Compound Approach

1984 ◽  
Vol 57 (2) ◽  
pp. 275-283 ◽  
Author(s):  
R. Vukov
Keyword(s):  
Model Compound ◽  
Product Distribution ◽  
Butyl Rubber ◽  
Methyl Groups ◽  
Reaction Site ◽  
Model Compounds ◽  
Reaction Conditions ◽  
Basic Study ◽  
Rubber Model ◽  
Trisubstituted Alkenes

Abstract The study of the halogenation behavior of butyl rubber model compounds has brought about a better understanding of the behavior of these systems. It has been established that the presence of methyl groups, in a position B to the reaction site in the butyl rubber model compound, profoundly influences the course of halogenation. Due to the steric hindrance imposed by these groups, both the products of chlorination and bromination deviate from patterns typical of other trisubstituted alkenes. In the case of chlorination, this deviation is demonstrated by the absence of addition products of chlorine across the double bond. In the case of bromination reactions, the change in product distribution is even more dramatic. Thus, substitution products normally not observed in bromination reactions of other trisubstituted alkenes become predominant products found in yields of between 70–90% depending on the precise reaction conditions. The behavior of the butyl model compound appears to be entirely consistent with the behavior of butyl rubber itself; the model compound approach is therefore a valuable tool for use in the basic study of this type of system.

Photocatalytic hydroxylation of benzene to phenol over organosilane-functionalized FeVO4 nanorods

2021 ◽  
Author(s):  
Danlei Wei ◽  
Lianqi Huang ◽  
Hanying Liang ◽  
Junhua Zou ◽  
Wenwen Chen ◽  
...  
Keyword(s):  
Synthetic Approach ◽  
Hydroxylation Of Benzene ◽  
Phenol Synthesis ◽  
Benzene Hydroxylation ◽  
Hydroxylation Reaction

Photocatalytic benzene hydroxylation reaction using clean oxidant such as H2O2 is a green synthetic approach for phenol synthesis. Here, our study shows that the silylated iron vanadate (FeVO4) nanorods can...

Transition metal-free C(sp3)–H bond coupling among three methyl groups

2017 ◽  
Vol 53 (38) ◽  
pp. 5346-5349 ◽  
Author(s):  
Yufeng Liu ◽  
Xi Zhan ◽  
Pengyi Ji ◽  
Jingwen Xu ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Methyl Groups ◽  
Methyl Ketones ◽  
Reaction Conditions ◽  
Methyl Group ◽  
Metal Free

A coupling of multiple C(sp3)–H bonds of the methyl group in methyl ketones with dimethyl sulfoxides was developed under transition metal-free reaction conditions.

Preparation of iron phthalocyanine complex bearing four tetraazamacrocycles as a precursor for oxidation catalyst with two catalytic sites

2009 ◽  
Vol 13 (06) ◽  
pp. 747-752
Author(s):  
Ümit İşci ◽  
Ayşe Gül Gürek ◽  
Vefa Ahsen ◽  
Alexander B. Sorokin
Keyword(s):  
Oxidation Catalyst ◽  
Iron Phthalocyanine ◽  
Reaction Conditions ◽  
Phthalocyanine Complex ◽  
Catalytic Sites

The synthesis of the iron phthalocyanine bearing four fused tetraazamacrocycles starting from N,N',N″,N‴-tetrakis(p-tolylsulfonyl)triethylenetetraamine and 1,2-dibromo-4,5-bis(bromomethyl)benzene is reported. The exchange of protecting tosyl groups by acetyl groups was necessary to obtain iron phthalocyanine. The efficiency of iron phthalocyanine as oxidation catalyst was tested for the practically important oxidation of 2,3,6-trimethylphenol (TMP) at different reaction conditions.

Intramolecular Diels–Alder reactions of 2H-thiopyran dienes

1996 ◽  
Vol 74 (7) ◽  
pp. 1418-1436 ◽  
Author(s):  
Dale E. Ward ◽  
Thomas E. Nixey ◽  
Yuanzhu Gai ◽  
Matthew J. Hrapchak ◽  
M. Saeed Abaee
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Thermal Conditions ◽  
Sigmatropic Rearrangement ◽  
Diels Alder ◽  
Methyl Groups ◽  
Type Ii ◽  
Reaction Conditions ◽  
Terminal Olefin ◽  
High Stereoselectivity

A systematic survey of IMDA reactions of 4-[tris(2-methylethyl)silyl]oxy-2H-thiopyran derivatives with potential dienophiles tethered at the C-2, C-3, C-5, and C-6 positions is presented. Cycloaddition was not observed with a C3 or C4 tether and an unactivated terminal olefin as dienophile. IMDA adducts could be obtained when dienophiles activated by a carbomethoxy group were employed. Compounds having the activated dienophile attached via a C3 tether to C-2 of the 2H-thiopyran gave adducts with high stereoselectivity. Substrates having the dienophile attached to C-3 with a C3 or C4 tether cyclized readily. With an (E)-enoate as the dienophile, the stereoselectivity was poor (endo:exo = 1.1–2.5:1) and essentially independent of reaction conditions (i.e., thermal vs. Lewis acid mediated). With the(Z)-enoate, a 7:1 mixture of endo:exo IMDA adducts was obtained under thermal conditions; with Lewis acid catalysis, isomerization of the dienophile was competitive with cycloaddition. Type II IMDA adducts were not observed with C-5 tethered substrates. Compounds having the dienophile attached to C-6 via a C3 or a five-atom tether also failed to give IMDA adducts. No evidence for isomerization of the 2H-thiopyran dienes by [1,5] sigmatropic rearrangement was observed. The endo adducts from IMDA reactions of the C-3 tethered substrates can be desulfurized to obtain synthetically useful trans-fused hydrindans and decalins with angular methyl groups. Key words: intramolecular Diels–Alder, 2H-thiopyran, cis-substituted 1,3-diene surrogate, trans-octahydro-3a-methyl-1H-indene derivatives, trans-decahydro-4a-methylnapthalene derivatives.

Three-dimensional Copper(I) Halide Based Coordination Networks with Asymmetrically Substituted Bridging N-Donor Ligands

1999 ◽  
Vol 54 (12) ◽  
pp. 1510-1516 ◽  
Author(s):  
B. Roßenbeck ◽  
W. S. Sheldrick
Keyword(s):  
Coordination Polymers ◽  
Self Assembly ◽  
Three Dimensional ◽  
Donor Ligands ◽  
Connectivity Pattern ◽  
Acetonitrile Solution ◽  
Coordination Networks ◽  
Reaction Conditions ◽  
Coordination Network ◽  
Discrete Complex

The discrete complex [(Cul)2 (pyzCN)4] (1) and the coordination polymers 1∞ [CuI(pyzCN)] (2) and 3∞ [(CuX)3 (pyzCN)2] (3, 4; X = Br, Cl) may be prepared from the respective copper(I) halide CuX and 2-cyanopyrazine (pyzCN) by self-assembly in acetonitrile solution at 100- 120°C. Whereas 2 exhibits 1 [Cul] staircase double chains as its characteristic substructure, the three-dimensional networks of 3 and 4 contain single zigzag CuX strings. The influence of the copper(I) halide on both the connectivity pattern and the dimensionality of a resulting coordination network is particularly apparent for the 1:1 complexes 1∞ [CuI(pymMe)] (5), 3∞ [(CuBr)3(pymMe)3] (6) and 2∞ [CuCl(pymMe)] (7), which were generated by reaction of CuX with 4-methylpyrimidine (pymMe) under reaction conditions similar to those above.

scholarly journals Function of Nanocatalyst in Chemistry of Organic Compounds Revolution: An Overview

2013 ◽  
Vol 2013 ◽  
pp. 1-23 ◽  
Author(s):  
Kanagarajan Hemalatha ◽  
Gunabalan Madhumitha ◽  
Amir Kajbafvala ◽  
Narayanan Anupama ◽  
Rajesh Sompalle ◽  
...  
Keyword(s):  
High Temperature ◽  
Green Synthesis ◽  
Surface Area ◽  
Organic Compounds ◽  
Heterocyclic Ring ◽  
Reaction Conditions ◽  
Reaction Condition ◽  
Pharmaceutical Applications ◽  
Current Review ◽  
Multistep Reaction

Heterocyclic motif is an important scaffold which has both industrial and pharmaceutical applications. These motifs can be prepared using wide variety of reaction conditions such as the use of expensive catalyst, toxic solvent, harsh reaction condition like the use of base, high temperature, and multistep reaction. Although various methods are involved, the chemistry arena is now shifted towards the greener way of synthesis. Nanocatalyst constitutes an important role in the green synthesis. This is because the activity of the catalyst resides in the exposed portion of the particles. By decreasing the size of the catalyst, advantages such as more surface area would be exposed to the reactant, only negligible amount would be required to give the significant result and selectivity could be achieved, thereby, eliminating the undesired products. The current review enlists the various types of nanocatalyst involved in the heterocyclic ring formation and also some other important functionalization over the ring.

1,1- and 1,2-Allylboration of Alkyn-1-ylsilanes Bearing Si-H Functions. Electron-Deficient Si-H-B Bridges, and Intramolecular Hydrosilylation

2006 ◽  
Vol 61 (3) ◽  
pp. 243-251 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Oleg L. Tok
Keyword(s):  
Silicon Atom ◽  
Methyl Groups ◽  
Reaction Conditions ◽  
Nmr Data ◽  
In Cis

Abstract The reactions of n-hexyn-1-ylsilanes or arylethyn-1-ylsilanes, bearing methyl groups and one (2), two (3) or three hydride functions (4) at the silicon atom, with triallylborane 1 lead primarily to products of 1,1- or 1,2-allylboration. In the alkenes (5, 9, 13) formed by stereoselective 1,1-allylboration, with the silyl and the diallylboryl groups in cis-positions at the C=C bond an electron-deficient Si-H-B bridge is present. The activation of the Si-H bond in these alkenes induces intramolecular hydrosilylation under very mild reaction conditions to give 1,4-silabora-cyclohept-2-enes (7 and 11). The products of 1,2-allylboration (6, 10, 14) are further transformed into 1-boracyclohex-2-enes (8, 12, 15) and 7-borabicyclo[3.3.1]non-2-enes (16, 17) by intramolecular 1,2-allylboration reactions. The proposed structures are based on consistent sets of 1H, 11B, 13C and 29Si NMR data.

High catalytic methane oxidation activity of monocationic μ-nitrido-bridged iron phthalocyanine dimer with sixteen methyl groups

2021 ◽  
Author(s):  
Yasuyuki Yamada ◽  
Jyunichi Kura ◽  
Yuka Toyoda ◽  
Kentaro Tanaka
Keyword(s):  
Methane Oxidation ◽  
Methyl Groups ◽  
Iron Phthalocyanine ◽  
Oxidation Activity ◽  
Catalytic Methane Oxidation

High catalytic methane oxidation activity of a μ-nitrido-bridged iron phthalocyanine dimer was achieved by introducing 16 electron-donating methyl groups onto the phthalocyanine rings.

scholarly journals Visible-Light-Mediated Photocatalytic Selective N-Methylation of Amines using CO2 under mild reaction condition via NH2-MIL-125 (Ti) MOF catalyst

2021 ◽  
Author(s):  
Jianguo liu ◽  
Xiuzhi Wei ◽  
Longlong Ma
Keyword(s):  
Visible Light ◽  
Metal Organic Framework ◽  
Synthesis Method ◽  
Selective Synthesis ◽  
Facile Synthesis ◽  
Reaction Conditions ◽  
Reaction Condition ◽  
Photocatalytic System ◽  
Metal Organic ◽  
Organic Framework

We herein describe a facile synthesis method of novel NH2-MIL-125 (Ti) metal organic framework as a photocatalyst, and the photochemical system was firstly developed for the direct N-methylation of amines under very mild reaction conditions of one bar CO2 and NaBH4. According to the optimization of reaction conditions, the selective synthesis of methylamines is achieved in good to excellent conversion and selectivity using visible light mediated photocatalytic system.

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