John F. Hansen

478 total citations
42 papers, 310 citations indexed

About

John F. Hansen is a scholar working on Organic Chemistry, Pharmaceutical Science and Physical and Theoretical Chemistry. According to data from OpenAlex, John F. Hansen has authored 42 papers receiving a total of 310 indexed citations (citations by other indexed papers that have themselves been cited), including 38 papers in Organic Chemistry, 6 papers in Pharmaceutical Science and 5 papers in Physical and Theoretical Chemistry. Recurrent topics in John F. Hansen's work include Synthesis and Reactions of Organic Compounds (19 papers), Synthesis and Biological Evaluation (12 papers) and Fluorine in Organic Chemistry (6 papers). John F. Hansen is often cited by papers focused on Synthesis and Reactions of Organic Compounds (19 papers), Synthesis and Biological Evaluation (12 papers) and Fluorine in Organic Chemistry (6 papers). John F. Hansen collaborates with scholars based in United States, Germany and South Korea. John F. Hansen's co-authors include Leo A. Paquette, Peter W. Jeffs, Scott A. Strong, George A. Brine, Jeremiah P. Freeman, Yong In Kim, Susan P. McCormick, Larry B. Anderson, Su Wang and D.X. West and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Organic Chemistry and Tetrahedron.

In The Last Decade

John F. Hansen

40 papers receiving 282 citations

Peers

John F. Hansen
Herman O. Krabbenhoft United States
M. L. QUIROGA Spain
Heinz Eilingsfeld Germany
M. Lesage Canada
G. FUKATA Japan
Л. Брандсма Netherlands
Shino Sakai Japan
A. TUNDO Italy
A. LAURENT France
F. Bertini Italy
Herman O. Krabbenhoft United States
John F. Hansen
Citations per year, relative to John F. Hansen John F. Hansen (= 1×) peers Herman O. Krabbenhoft

Countries citing papers authored by John F. Hansen

Since Specialization
Citations

This map shows the geographic impact of John F. Hansen'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 F. Hansen with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John F. Hansen more than expected).

Fields of papers citing papers by John F. Hansen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John F. Hansen. 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 F. Hansen. The network helps show where John F. Hansen may publish in the future.

Co-authorship network of co-authors of John F. Hansen

This figure shows the co-authorship network connecting the top 25 collaborators of John F. Hansen. A scholar is included among the top collaborators of John F. Hansen based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John F. Hansen. John F. Hansen is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Hansen, John F., et al.. (2004). 8-Oxabicyclo[3.2.1]octa-3,6-dien-2-one Synthesis Using a Pyrylium 3-Oxide Precursor Derived from a 4-Oxo-4H-pyrazole 1,2-Dioxide. Heterocycles. 62(1). 387–387. 1 indexed citations
2.
3.
Hansen, John F., et al.. (1994). Preparation of 4‐bromo‐1‐hydroxypyrazole 2‐oxides by nitrosation of α‐bromo‐α,β‐unsaturated ketoximes. Journal of Heterocyclic Chemistry. 31(2). 281–286. 8 indexed citations
4.
5.
Hansen, John F., et al.. (1993). Preparation of 3(5)‐phenyl‐1‐hydroxypyrazole 2‐oxide and 4‐methyl‐3(5)‐phenyl‐1‐hydroxypyrazole 2‐oxide. Journal of Heterocyclic Chemistry. 30(4). 1163–1166. 3 indexed citations
6.
Hansen, John F. & J.L. Flippen-Anderson. (1986). ChemInform Abstract: Stereochemical Assignments for 1‐Phenyl‐1,2,3‐butanetrione 2‐Oxime and Related Compounds.. Chemischer Informationsdienst. 17(12).
7.
Stevenson, Cheryl D., Laurel E. Schock, Richard C. Reiter, & John F. Hansen. (1983). An azocine anion radical and heats of formation of azocine dianions. Journal of the American Chemical Society. 105(19). 6078–6082. 4 indexed citations
8.
Hansen, John F., et al.. (1980). Halogenation of vinyl ketoximes. Synthesis of isoxazoles and preparation and silver ion‐promoted reactions of 4‐halo‐2‐isoxazolines. Journal of Heterocyclic Chemistry. 17(3). 475–479. 13 indexed citations
9.
Hansen, John F., et al.. (1980). Halogenation of N-oxygenated pyrazoles. Preparation of N-oxygenated 4-halopyrazole and 4,4-dihalo-4H-pyrazole derivatives. The Journal of Organic Chemistry. 45(1). 76–80. 18 indexed citations
10.
Hansen, John F., et al.. (1979). Formation of N,N-dialkylhydroxylamines in the oximation of some Mannich bases. The Journal of Organic Chemistry. 44(4). 661–662. 2 indexed citations
11.
Stevenson, Cheryl D., et al.. (1979). Substituted diazacyclopentadienone anion radicals. The Journal of Organic Chemistry. 44(18). 3211–3215. 9 indexed citations
12.
Hansen, John F., Susan P. McCormick, & D.X. West. (1977). 3-フェニル-5-メチル-1-ヒドロキシピラゾール-2-オキシドの共役塩基の遷移金属イオン錯体. Journal of Inorganic and Nuclear Chemistry. 39(7). 1231–1233. 6 indexed citations
13.
Hansen, John F., et al.. (1977). ChemInform Abstract: PREPARATION AND GRIGNARD REACTIONS OF 2‐BENZOYL‐4,4‐DIMETHYL‐2‐OXAZOLINE. Chemischer Informationsdienst. 8(7). 1 indexed citations
14.
Jeffs, Peter W., John F. Hansen, & George A. Brine. (1976). ChemInform Abstract: PHOTOCHEMICAL SYNTHESIS OF 6,7‐DIHYDRO‐5H‐DIBENZ(C,E)AZEPINE AND 5,6,7,8‐TETRAHYDRODIBENZ(C,E)AZOCINE DERIVATIVES. Chemischer Informationsdienst. 7(1). 12 indexed citations
15.
Hansen, John F. & Michael J. O’Hare. (1976). Mass spectral fragmentation of 4‐oxo‐4H‐pyrazole 1‐oxides and 1,2‐dioxides. Journal of Heterocyclic Chemistry. 13(5). 985–987. 2 indexed citations
16.
Freeman, Jeremiah P., et al.. (1972). Novel ring expansion of a diazacyclopentadienone dioxide. The Journal of Organic Chemistry. 37(17). 2756–2757. 5 indexed citations
17.
Paquette, Leo A., et al.. (1972). Unsaturated heterocyclic systems. LXXXV. Benzoannelation effects on azocine reactivity. Chemical and polarographic reduction of several mono-, di-, and tribenzomethoxyazocines. Journal of the American Chemical Society. 94(14). 4907–4915. 9 indexed citations
18.
Freeman, Jeremiah P. & John F. Hansen. (1972). New tetra-azafulvalene (bipyrazol-4-ylidene) derivatives. Journal of the Chemical Society Chemical Communications. 961–961. 6 indexed citations
19.
Paquette, Leo A., et al.. (1971). Unsaturated heterocyclic systems. LXXIV. Electrochemical studies of the reduction of 2-methoxyazocines in aprotic solvents. Comparison with the cyclooctatetraene system. Journal of the American Chemical Society. 93(1). 161–167. 13 indexed citations
20.
Paquette, Leo A., et al.. (1970). Electrochemical characterization of azocinyl dianions. Tetrahedron Letters. 11(7). 533–536. 4 indexed citations

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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