Results 31 to 40 of about 103,808 (305)

Regio- and Stereoselective Ruthenium Catalyzed Hydrovinylation of 1,3-Dienes: Application to the Generation of a 20S-Steroidal Sidechain [PDF]

open access: yes, 2003
The addition of ethylene to 1,3-dienes and 1-vinylcycloalkenes, catalyzed by two ruthenium complexes, proceeds in a regioselective fashion to afford 3-methyl-1,4-dienes as products. For a steroidal-based 1-vinylcycloalkene, the addition is stereospecific,
Donaldson, William A.   +2 more
core   +3 more sources

Les cultures religieuses et leurs signifiances dans les poésies des civilisations modernes

open access: yesCaligrama: Revista de Estudos Românicos, 2011
Resumo: No século XX, o recuo da prática religiosa não fez desaparecer a religião das obras, que continuam marcadas por essa prática. Até mesmo as obras blasfematórias exprimem, em seu conteúdo e forma, uma certa cultura religiosa, assim como outros ...
Ibra Diène
doaj   +1 more source

dienes [PDF]

open access: yes, 2014
Citation: 'dienes' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.D01699 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Toward a simulation approach for alkene ring-closing metathesis : scope and limitations of a model for RCM [PDF]

open access: yes, 2011
A published model for revealing solvent effects on the ring-closing metathesis (RCM) reaction of di-Et diallylmalonate 7 has been evaluated over a wider range of conditions, to assess its suitability for new applications.
Adjiman C. S.   +33 more
core   +1 more source

Mechanism, reactivity, and selectivity of nickel-catalyzed [4 + 4 + 2] cycloadditions of dienes and alkynes. [PDF]

open access: yes, 2014
Density functional theory (DFT) calculations with B3LYP and M06 functionals elucidated the reactivities of alkynes and Z/E selectivity of cyclodecatriene products in the Ni-catalyzed [4 + 4 + 2] cycloadditions of dienes and alkynes.
Baran, Phil S   +4 more
core   +2 more sources

Photolytic Cleavage and Condensation Reactions of Cyclohexa-2,4-dienones with Diamines

open access: yesMolecules, 2000
Cyclohexa-2,4-diene-1-one sulfone derivate undergoes ring cleavage to afford bis-amides containing a diene moiety on irradiation with visible light in the presence of various diamines.
Sung Kee Chung   +3 more
doaj   +1 more source

Unusual structure-energy correlations in intramolecular Diels–Alder reaction transition states [PDF]

open access: yes, 2014
Detailed analysis of calculated data from an experimental/computational study of intramolecular furan Diels–Alder reactions has led to the unusual discovery that the mean contraction of the newly forming C-C σ-bonds from the transition state to the ...
Bebbington, Magnus   +3 more
core   +2 more sources

Ion‐Selective Microporous Membranes via One‐Step Copolymerization Enable High‐Performance Redox Flow Batteries

open access: yesAdvanced Functional Materials, EarlyView.
A scalable one‐step copolymerization strategy is developed to produce low‐cost microporous ion exchange membranes that boost both the efficiency and lifespan of flow batteries. When combined with organic electrolytes in aqueous systems, these membranes enable safe and cheap flow battery energy storage, supporting the widespread integration of renewable
Jiaye Liu   +7 more
wiley   +1 more source

Initiation of Olefin Metathesis: Reaction of Deca-2,8-diene with Catalysts formed from Me_4Sn-WC1_6 and Me_3Al_2Cl_3-(Ph_3P)_2(NO)_2Cl_2Mo [PDF]

open access: yes, 1977
The initial product of the metathesis of deca-2,8-diene with metathesis catalysts formed from either Me_4Sn–WCl_6 or Me_3Al_2Cl_3–(Ph_3P)_2(NO)_2Cl_2Mo is propene; labelling of the terminal groups of the diene and the alkylating agents gives a labelling ...
Grubbs, Robert H., Hoppin, Charles R.
core  

Electrosynthesis of Bioactive Chemicals, From Ions to Pharmaceuticals

open access: yesAdvanced Functional Materials, EarlyView.
This review discusses recent advances in electrosynthesis for biomedical and pharmaceutical applications. It covers key electrochemical materials enabling precise delivery of ions and small molecules for cellular modulation and disease treatment, alongside catalytic systems for pharmaceutical synthesis.
Gwangbin Lee   +4 more
wiley   +1 more source

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