Results 21 to 30 of about 103,808 (305)

Stereo- and regioselectivity of the hetero-Diels–Alder reaction of nitroso derivatives with conjugated dienes

open access: yesBeilstein Journal of Organic Chemistry, 2016
The hetero-Diels–Alder reaction between a nitroso dienophile and a conjugated diene to give the 3,6-dihydro-2H-1,2-oxazine scaffold is useful for the synthesis of many biologically interesting molecules due to the diverse opportunities created by ...
Lucie Brulíková   +3 more
doaj   +1 more source

Manganese carbonyl-mediated reactions of azabutadienes with phenylacetylene, methyl acrylate and other unsaturated molecules [PDF]

open access: yes, 2004
Reaction of PhCH₂Mn(CO)₅ with l,4-di-aryl-1-aza-1,3-butadienes gave substituted pyrrolinonyl rings which were η⁴-coordinated to a Mn(CO)₃ group. These are formed by intramolecular CO insertion into a (non-isolated) cyclomanganated intermediate, followed ...
Mace, Wade   +3 more
core   +2 more sources

Synthesis and Diels-Alder Reactions of 1,2-Dimethylene- and 1,2,9,10-Tetramethylene-[2.2]paracyclophane: New Routes to Bridge-Anellated[2.2]Paracyclophanedienes [PDF]

open access: yes, 1992
The title compounds 8 and 1 have been synthesized in three steps each from 1,2-dibromo[2.2]paracyclophan-1-ene (2) and 1,2,9,10-tetrabromo[2.2]paracyclophane-1,9-diene (4), respectively. Copper-mediated coupling of vinyl bromides 2 and 4 with methyl- and
Bailey   +28 more
core   +2 more sources

Substrate Dependence in Aqueous Diels-Alder Reactions of Cyclohexadiene Derivatives with 1,4-Benzoquinone

open access: yesMolecules, 2005
A reactivity difference based on the position of substituents on cyclohexa-1,3- diene was observed for the title reaction. The effect of water as solvent was more distinct for 1-methyl-4-isopropylcyclohexa-1,3-diene than for 2-methyl-5-isopropylcyclohexa-
Chiaki Kuroda, Takeshi Sunakawa
doaj   +1 more source

"Research summary on hydrogenated styrene-diene copolymer viscosity index improver"

open access: yesHecheng xiangjiao gongye, 2023
The development history, market overview and development status of viscosity index improver for hydrogenated styrene-diene copolymer at home and abroad were systematically summarized with 38 references, and the basic classification, performance ...
LI Wei-tian, WANG Qin-fang, ZHANG Wang, DONG Jing, ZHANG Hua-qiang
doaj   +1 more source

Decarboxylative and dehydrative coupling of dienoic acids and pentadienyl alcohols to form 1,3,6,8-tetraenes

open access: yesBeilstein Journal of Organic Chemistry, 2017
Dienoic acids and pentadienyl alcohols are coupled in a decarboxylative and dehydrative manner at ambient temperature using Pd(0) catalysis to generate 1,3,6,8-tetraenes.
Ghina’a I. Abu Deiab   +11 more
doaj   +1 more source

A cobalt complex of a microbial arene oxidation product

open access: yesChemistry Central Journal, 2011
We report the first synthesis of a cobalt Cp diene complex wherein the diene is derived by microbial dearomatising dihydroxylation of an aromatic ring.
van der Waals Dominic   +5 more
doaj   +1 more source

Antioxidant activity of alkyl gallates and glycosyl alkyl gallates in fish oil in water emulsions: Relevance of their surface active properties and of the type of emulsifier [PDF]

open access: yes, 2015
The antioxidant activity of gallic acid and a series of alkyl gallates (C4-C18) and glycosylated alkyl gallates (C4-C18) on fish oil-in-water emulsions was studied.
González, M. Jesús   +4 more
core   +2 more sources

From sequence-defined macromolecules to macromolecular pin codes [PDF]

open access: yes, 2020
Dynamic sequence-defined oligomers carrying a chemically written pin code are obtained through a strategy combining multicomponent reactions with the thermoreversible addition of 1,2,4-triazoline-3,5-diones (TADs) to indole substrates.
Badi, Nezha   +4 more
core   +1 more source

The Intramolecular Radical Cation Induced Diels-Alder Reaction in the Diene - Diene Format

open access: yesMolecules, 1997
Two 1,3,8,10-undecatetraenes were synthesized to test the viability of the intramolecular radical cation induced Diels-Alder reaction in the diene - diene format.
Paul G. Gassman   +2 more
doaj   +1 more source

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