Metal Free Azide–Alkyne Click Reaction: Role of Substituents and Heavy Atom Tunneling

2015 ◽  
Vol 119 (35) ◽  
pp. 11540-11547 ◽  
Author(s):  
Sharmistha Karmakar ◽  
Ayan Datta
Keyword(s):  
Click Reaction ◽  
Heavy Atom ◽  
Metal Free

1,3-dipolar cycloaddition in the synthesis of glycoconjugates of natural chlorins and bacteriochlorins

2009 ◽  
Vol 13 (03) ◽  
pp. 336-345 ◽  
Author(s):  
Mikhail A. Grin ◽  
Ivan S. Lonin ◽  
Anna A. Lakhina ◽  
Elena S. Ol'shanskaya ◽  
Alexey I. Makarov ◽  
...  
Keyword(s):  
Triple Bond ◽  
Tautomeric Form ◽  
Click Reaction ◽  
Copper Cation ◽  
Water Soluble ◽  
Dipolar Cycloaddition ◽  
Nmr Studies ◽  
Metal Free ◽  
Cu Complex ◽  
Derivatives Of

Glucose-, galactose- and lactose-containing photosensitizers based on derivatives of chlorophyll a and bacteriochlorophyll a were synthesized with the use of [3+2] cycloaddition between sugar azides and triple bond derivatives of chlorins and bacteriochlorins. Unlike bacteriochlorin cycloimide, chlorin was detected to form a Cu -complex during the click reaction. An approach to the synthesis of metal-free glycosylated chlorins was developed with the use of "protection" by Zn 2+ cation and subsequent demetalation. It is based on the action of alkynyl chlorin e6 derivative Zn -complex, which is resistant to the substitution by copper cation. Bacteriochlorin p cycloimide conjugate with per-acetylated β-D-lactose was obtained and shown to become water-soluble after unblocking of the lactose hydroxy functions. NMR studies allowed for the elucidation of structure, tautomeric form and conformation of the obtained compounds.

Synthesis and Characterization of a Novel Linear Benzoxazine-Containing Polytriazole via Metal-Free Click Reaction and its Self-Crosslinking Behavior

2012 ◽  
Vol 557-559 ◽  
pp. 973-978
Author(s):  
Zhong Yi Xu ◽  
Lei Du ◽  
Li Qiang Wan ◽  
Fa Rong Huang
Keyword(s):  
Click Reaction ◽  
Decomposition Temperature ◽  
Linear Polymer ◽  
The Novel ◽  
Metal Free ◽  
Crosslinked Polymer ◽  
Degradation Behaviors ◽  
Ft Ir ◽  
Increasing Temperature

A novel linear benzoxazine-containing polytriazole was successfully synthesized via metal-free click reaction. Benefited from the advantages of click reaction, the synthesis procedure was easily and efficiently. The linear polymer could be transformed into crosslinked structure after ring-opening polymerization of oxazine induced by the increasing temperature. The FT-IR characterization verified the structure transformation between linear and crosslinked polymer. Moreover, the thermal properties and thermal degradation behaviors of linear polymer and the corresponding crosslinked polymer were studied by DSC and TGA. The novel polytriazole was proved to be a kind of thermal stable polymers with high thermal decomposition temperature (Td5over 300°C).

Efficient Metal-Free Norbornadiene–Maleimide Click Reaction for the Formation of Molecular Bottlebrushes

2021 ◽  
Author(s):  
Zheqi Li ◽  
Wangmeng Hou ◽  
Yuanchao Li ◽  
Jianxiong Xu ◽  
Yi Shi ◽  
...  
Keyword(s):  
Click Reaction ◽  
Metal Free

scholarly journals Role of flexible bulky groups and weak interactions involving halogens in the vapoluminescence of a metal-free dye

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74506-74509 ◽  
Author(s):  
Y. Akune ◽  
R. Hirosawa ◽  
H. Takahashi ◽  
M. Shiro ◽  
S. Matsumoto
Keyword(s):  
Weak Interactions ◽  
Molecular Flexibility ◽  
Metal Free

The vapoluminescence of a 2,5-diamino-3,6-dicyanopyrazine dye was correlated with molecular flexibility of bulky substituents and weak interactions involving halogens.

scholarly journals Catalytic oxidative desulfurization of a 4,6-DMDBT containing model fuel by metal-free activated carbons: the key role of surface chemistry

2019 ◽  
Vol 21 (24) ◽  
pp. 6685-6698 ◽  
Author(s):  
Zoi Christina Kampouraki ◽  
Dimitrios A. Giannakoudakis ◽  
Konstantinos S. Triantafyllidis ◽  
Eleni A. Deliyanni
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Oxidative Desulfurization ◽  
Ambient Conditions ◽  
Metal Free ◽  
Model Fuel ◽  
Catalytic Oxidative Desulfurization

Commercial micro/mesoporous activated carbons were utilized as metal-free catalysts for the desulfurization of a model fuel, i.e. 4,6-dimethyldibenzothiophene (4,6-DMDBT) in hexadecane, under ambient conditions. Oxidation of carbons led to a further catalytic improvement.

BODIPY‐Based Photosensitizers as Potential Anticancer and Antibacterial Agents: Role of the Positive Charge and the Heavy Atom Effect

ChemMedChem ◽  
2020 ◽  
Author(s):  
Jaroslaw Piskorz ◽  
Weronika Porolnik ◽  
Malgorzata Kucinska ◽  
Jolanta Dlugaszewska ◽  
Marek Murias ◽  
...  
Keyword(s):  
Antibacterial Agents ◽  
Positive Charge ◽  
Heavy Atom ◽  
Heavy Atom Effect ◽  
Atom Effect

scholarly journals Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH3

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 12908-12919
Author(s):  
Weifeng Li ◽  
Shuangling Jin ◽  
Rui Zhang ◽  
Yabin Wei ◽  
Jiangcan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Carbon Aerogels ◽  
Phosphorus Doping ◽  
Reduction Of No ◽  
Metal Free

P species can effectively enhance the catalytic activity of carbon aerogels for NO reduction at low temperature.

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