Roger Ketcham

1.1k total citations
45 papers, 879 citations indexed

About

Roger Ketcham is a scholar working on Organic Chemistry, Spectroscopy and Physical and Theoretical Chemistry. According to data from OpenAlex, Roger Ketcham has authored 45 papers receiving a total of 879 indexed citations (citations by other indexed papers that have themselves been cited), including 37 papers in Organic Chemistry, 5 papers in Spectroscopy and 4 papers in Physical and Theoretical Chemistry. Recurrent topics in Roger Ketcham's work include Synthesis and Characterization of Heterocyclic Compounds (15 papers), Synthesis of heterocyclic compounds (13 papers) and Synthesis and Reactivity of Sulfur-Containing Compounds (12 papers). Roger Ketcham is often cited by papers focused on Synthesis and Characterization of Heterocyclic Compounds (15 papers), Synthesis of heterocyclic compounds (13 papers) and Synthesis and Reactivity of Sulfur-Containing Compounds (12 papers). Roger Ketcham collaborates with scholars based in United States, Germany and Austria. Roger Ketcham's co-authors include Ernst Schaumann, A. S. Verkman, Anthony C. Chao, John R. Johnson, Vinod P. Shah, I. Moyer Hunsberger, Salo Gronowitz, Ḡunadi Adiwidjaja, Elwood R. Shaw and Daniel Lednicer and has published in prestigious journals such as Journal of the American Chemical Society, Analytical Biochemistry and Journal of Medicinal Chemistry.

In The Last Decade

Roger Ketcham

45 papers receiving 825 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Roger Ketcham United States 16 503 181 114 110 80 45 879
Hiroshi Kawazura Japan 13 881 1.8× 215 1.2× 173 1.5× 205 1.9× 75 0.9× 58 1.2k
B. G. Roberts 11 296 0.6× 261 1.4× 135 1.2× 186 1.7× 186 2.3× 17 760
David A. Ben-Efraim Israel 12 482 1.0× 111 0.6× 80 0.7× 126 1.1× 60 0.8× 20 724
Masaki Ohta Japan 17 1.4k 2.9× 336 1.9× 87 0.8× 189 1.7× 97 1.2× 146 1.8k
Donato Donati Italy 18 634 1.3× 210 1.2× 92 0.8× 191 1.7× 41 0.5× 80 918
George E. Drucker United States 12 818 1.6× 215 1.2× 121 1.1× 101 0.9× 51 0.6× 18 1.2k
John D. Hepworth United Kingdom 18 591 1.2× 122 0.7× 111 1.0× 359 3.3× 45 0.6× 91 947
E. Campaigne United States 20 1.3k 2.5× 251 1.4× 123 1.1× 110 1.0× 43 0.5× 167 1.7k
Peter Boldt Germany 15 454 0.9× 111 0.6× 50 0.4× 157 1.4× 50 0.6× 86 740
H. R. Snyder United States 23 1.3k 2.5× 484 2.7× 149 1.3× 216 2.0× 32 0.4× 96 1.8k

Countries citing papers authored by Roger Ketcham

Since Specialization
Citations

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

Fields of papers citing papers by Roger Ketcham

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Roger Ketcham. 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 Roger Ketcham. The network helps show where Roger Ketcham may publish in the future.

Co-authorship network of co-authors of Roger Ketcham

This figure shows the co-authorship network connecting the top 25 collaborators of Roger Ketcham. A scholar is included among the top collaborators of Roger Ketcham 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 Roger Ketcham. Roger Ketcham 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.
Schaumann, Ernst & Roger Ketcham. (2006). [2+2]-Cycloreversionen. Angewandte Chemie. 94(4). 231–253. 5 indexed citations
2.
Biwersi, Joachim, et al.. (1992). Synthesis of cell-impermeable Cl-sensitive fluorescent indicators with improved sensitivity and optical properties. American Journal of Physiology-Cell Physiology. 262(1). C243–C250. 23 indexed citations
3.
Verkman, A. S., et al.. (1989). Synthesis and characterization of improved chloride-sensitive fluorescent indicators for biological applications. Analytical Biochemistry. 178(2). 355–361. 178 indexed citations
4.
5.
6.
Schaumann, Ernst & Roger Ketcham. (1982). [2 + 2]‐Cycloreversions. Angewandte Chemie International Edition in English. 21(4). 225–247. 57 indexed citations
7.
Ketcham, Roger, et al.. (1980). Heterocyclic Ring-Closure Reactions; VII1. A Facile Synthesis of 5-Imino-4-oxazolidinethiones and 4-Thioxo-5-oxazolidinones. Synthesis. 1980(11). 869–870. 20 indexed citations
8.
9.
Ketcham, Roger, et al.. (1974). ChemInform Abstract: CHEMISTRY OF 2‐TETRAHYDROPYRANTHIOL. Chemischer Informationsdienst. 5(45). 3 indexed citations
10.
Ketcham, Roger, et al.. (1974). Chemistry of 2-tetrahydropyranthiol. The Journal of Organic Chemistry. 39(14). 2010–2012. 13 indexed citations
11.
Ketcham, Roger, Thomas Kappe, & E. Ziegler. (1973). Synthesis of heterocycles. 174 substituted thiazines and bisthiazinyls from dithiooxamide and trichlorophenyl malonates. Journal of Heterocyclic Chemistry. 10(2). 223–224. 3 indexed citations
12.
Ketcham, Roger, et al.. (1972). Three-membered rings. III. Ultraviolet spectral evidence of a stereochemical bias in rigid p-nitrophenylcyclopropanes. The Journal of Organic Chemistry. 37(14). 2278–2281. 4 indexed citations
13.
14.
Ketcham, Roger, et al.. (1970). Thiazolothiazoles. II. Parent heterocycle and its carboxylic and amino derivatives. Journal of the American Chemical Society. 92(13). 4046–4050. 53 indexed citations
15.
Ketcham, Roger. (1964). The amine catalyzed Perkin condensation: A class project. Journal of Chemical Education. 41(10). 565–565. 1 indexed citations
16.
Ketcham, Roger, et al.. (1963). Nitration of Phenylcyclopropane. ortho—para Ratios for Nitration of Alkylbenzenes with Acetyl Nitrate1. The Journal of Organic Chemistry. 28(8). 2139–2141. 10 indexed citations
17.
Ketcham, Roger, et al.. (1962). The Preparation of cis-4-Nitro-4'-methoxystilbene via the Wittig Reaction. The Journal of Organic Chemistry. 27(12). 4666–4667. 46 indexed citations
18.
Johnson, John R. & Roger Ketcham. (1960). Thiazolothiazoles. I. The Reaction of Aromatic Aldehydes with Dithioöxamide1. Journal of the American Chemical Society. 82(11). 2719–2724. 69 indexed citations
19.
Hunsberger, I. Moyer, et al.. (1956). The Preparation of Substituted Hydrazines. IV. Arylhydrazines via Conventional Methods1. The Journal of Organic Chemistry. 21(4). 394–399. 46 indexed citations
20.
Julian, Percy L., et al.. (1953). Studies in the Indole Series. XIV. Oxindole-3-acetic Acid. Journal of the American Chemical Society. 75(21). 5305–5309. 22 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Hiroshi Kawazura Breakdown of academic impact, for papers by B. G. Roberts Breakdown of academic impact, for papers by David A. Ben-Efraim Breakdown of academic impact, for papers by Masaki Ohta Breakdown of academic impact, for papers by Donato Donati Breakdown of academic impact, for papers by George E. Drucker Breakdown of academic impact, for papers by John D. Hepworth Breakdown of academic impact, for papers by E. Campaigne Breakdown of academic impact, for papers by Peter Boldt Breakdown of academic impact, for papers by H. R. Snyder
Rankless by CCL
2026