John A. Ewen

3.1k citations

18 papers · 2.2k indexed · 2 hit papers · h-index 13

Impact in

Process Chemistry and Technology top 0.5%
- Carbon dioxide utilization in catalysis
Organic Chemistry top 1%
- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Organoboron and organosilicon chemistry
- Coordination Chemistry and Organometallics

Papers in

Process Chemistry and Technology 3
- Carbon dioxide utilization in catalysis 3
Inorganic Chemistry 8
- Asymmetric Hydrogenation and Catalysis 5
- Synthesis and characterization of novel inorganic/organometallic compounds 2

Co-authors: Robert L. Jones A. Razavi Joseph D. Ferrara M.J. Elder Jerry L. Atwood Hongming Zhang H. N. Cheng Simon G. Bott
Journals: Journal of the American Chemical Society (8 papers)Scientific American (1 paper)Macromolecular Symposia (1 paper)Macromolecular Chemistry and Physics (1 paper)Macromolecular Rapid Communications (1 paper)
Partner nations: United States Germany Italy

In The Last Decade

John A. Ewen

18 papers receiving 2.0k citations

Hit Papers

align trajectories log scale

Syndiospecific propylene polymerizations with Group IVB metallocenes 1988 · 726 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

1988 Journal of the American Chemical Society
1984 Journal of the American Chemical Society

Peers

Countries citing papers authored by John A. Ewen

Since Specialization

Citations

This map shows the geographic impact of John A. Ewen's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John A. Ewen with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John A. Ewen more than expected).

Fields of papers citing papers by John A. Ewen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John A. Ewen. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John A. Ewen. The network helps show where John A. Ewen may publish in the future.

Co-authors

The 16 scholars most cited alongside John A. Ewen, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with John A. Ewen Line = papers co-authored together John A. Ewen links everyone, so they are left out of the graph.

All Works

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18 of 18 papers shown

#	Work
1	Metallocenes with Cp Ring-Fused to Chalcogen Heterocycles: Synthesis and Polymerization Results Phosphorus, sulfur, and silicon and the related elements ·Robert L. Jones, M.J. Elder, John A. Ewen	2005	2
2	Stereoblock Isotactic‐Hemiisotactic Poly(propylene)s and Ethylene/Propylene Copolymers Obtained with ansa‐Cyclopenta[1,2‐b;4,3‐b′]dithiophene Catalysts Macromolecular Chemistry and Physics ·John A. Ewen, Robert L. Jones, M.J. Elder, Isabella Camurati, Hans Pritzkow	2004	12
3	Chiral Ansa Metallocenes with Cp Ring-Fused to Thiophenes and Pyrroles: Syntheses, Crystal Structures, and Isotactic Polypropylene Catalysts Journal of the American Chemical Society ·John A. Ewen, M.J. Elder, Robert L. Jones, Arnold L. Rheingold, Louise M. Liable‐Sands, Roger D. Sommer	2001	77
4	Chiral Ansa Metallocenes with Cp Ring-Fused to Thiophenes and Pyrroles: Syntheses, Crystal Structures, and Isotactic Polypropylene Catalysts [J. Am. Chem. Soc. 2001, 123, 4763−4773]. Journal of the American Chemical Society ·John A. Ewen, M.J. Elder, Robert L. Jones, Arnold L. Rheingold, Louise M. Liable‐Sands, Roger D. Sommer	2001	4
5	Evaluation of the dimethylsilyl-bis(2-methyl-4-phenyl-1-indenyl) ligand with group 4 triad metals in propene polymerizations with methylaluminoxane Macromolecular Rapid Communications ·John A. Ewen, Adolfo Zambelli, Pasquale Longo, E Bierhoff	1998	15
6	Polymerization Catalysts with Cyclopentadienyl Ligands Ring-Fused to Pyrrole and Thiophene Heterocycles Journal of the American Chemical Society ·John A. Ewen, Robert L. Jones, M.J. Elder, Arnold L. Rheingold, Louise M. Liable‐Sands	1998	62
7	Symmetry rules and reaction mechanisms of Ziegler–Natta catalysts1Dedicated to my mentor, Professor Adolfo Zambelli.1 Journal of Molecular Catalysis A Chemical ·John A. Ewen	1998	46
8	New Chemical Tools to Create Plastics Scientific American ·John A. Ewen	1997	29
9	Symmetrical and lopsided zirconocene pro‐catalysts Macromolecular Symposia ·John A. Ewen	1995	31
10	Syntheses and models for stereospecific metallocenes Makromolekulare Chemie Macromolecular Symposia ·John A. Ewen, M.J. Elder	1993	50
11	Metallocene/polypropylene structural relationships: Implications on polymerization and stereochemical control mechanisms Makromolekulare Chemie Macromolecular Symposia ·John A. Ewen, M.J. Elder, Robert L. Jones, R Baert, Jerry L. Atwood, Simon G. Bott, Ana Paula Freitas	1991	201
12	¹³C Nuclear magnetic resonance characterization of poly(propylene) prepared with homogeneous catalysts Die Makromolekulare Chemie ·H. N. Cheng, John A. Ewen	1989	67
13	Syndiospecific propylene polymerizations with Group IVB metallocenes Journal of the American Chemical Society ·John A. Ewen, Robert L. Jones, A. Razavi, Joseph D. Ferrara Hit paper breakdown →	1988	726
14	Crystal structures and stereospecific propylene polymerizations with chiral hafnium metallocene catalysts Journal of the American Chemical Society ·John A. Ewen, Конгбин Фу, Jerry L. Atwood, Hongming Zhang	1987	162
15	Mechanisms of stereochemical control in propylene polymerizations with soluble Group 4B metallocene/methylalumoxane catalysts Journal of the American Chemical Society ·John A. Ewen Hit paper breakdown →	1984	701
16	Kinetic studies of ligand substitution reactions and general-base catalysis in amine-ligand exchange processes for Group 6B metal carbonyl amine derivatives. Kinetic and spectroscopic evidence for hydrogen-bonded intermediates Inorganic Chemistry ·Donald J. Darensbourg, John A. Ewen	1981	7
17	Kinetic ambiguity between the Id and D mechanisms in ligand substitution reactions. The intimate mechanism for axial base-ligand exchange reactions in alkyl(base)cobaloximes and related species Journal of the American Chemical Society ·John A. Ewen, Donald J. Darensbourg	1976	6
18	Evidence for hydrogen-bonded intermediates in amine substitution reactions involving Group 6B metal pentacarbonyl amine derivatives with phosphines Journal of the American Chemical Society ·John A. Ewen, Donald J. Darensbourg	1975	8

About John A. Ewen

John A. Ewen is a scholar working on Process Chemistry and Technology, Inorganic Chemistry, Organic Chemistry, Catalysis and Physical and Theoretical Chemistry, having authored 18 papers that have together received 2.2k indexed citations. Recurring topics across this work include Organometallic Complex Synthesis and Catalysis (14 papers), Synthetic Organic Chemistry Methods (6 papers), Asymmetric Hydrogenation and Catalysis (5 papers), Carbon dioxide utilization in catalysis (3 papers), Advanced Polymer Synthesis and Characterization (2 papers), History and advancements in chemistry (2 papers), Synthesis and characterization of novel inorganic/organometallic compounds (2 papers) and Catalysis and Oxidation Reactions (2 papers). The work is most often cited by research in Process Chemistry and Technology (544 citations), Organic Chemistry (1.9k citations), Inorganic Chemistry (767 citations), Polymers and Plastics (346 citations) and Biomaterials (319 citations). John A. Ewen has collaborated with scholars based in United States, Germany and Italy. Frequent co-authors include Robert L. Jones, A. Razavi, Joseph D. Ferrara, M.J. Elder, Jerry L. Atwood, Hongming Zhang, H. N. Cheng, Simon G. Bott, Arnold L. Rheingold and Louise M. Liable‐Sands. Their work appears in journals such as Journal of the American Chemical Society, Scientific American, Macromolecular Symposia, Macromolecular Chemistry and Physics and Macromolecular Rapid Communications.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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