Francis M. Callahan

2.6k total citations · 1 hit paper
11 papers, 2.3k citations indexed

About

Francis M. Callahan is a scholar working on Molecular Biology, Organic Chemistry and Spectroscopy. According to data from OpenAlex, Francis M. Callahan has authored 11 papers receiving a total of 2.3k indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Molecular Biology, 7 papers in Organic Chemistry and 3 papers in Spectroscopy. Recurrent topics in Francis M. Callahan's work include Chemical Synthesis and Analysis (9 papers), Carbohydrate Chemistry and Synthesis (3 papers) and Synthesis and Characterization of Heterocyclic Compounds (2 papers). Francis M. Callahan is often cited by papers focused on Chemical Synthesis and Analysis (9 papers), Carbohydrate Chemistry and Synthesis (3 papers) and Synthesis and Characterization of Heterocyclic Compounds (2 papers). Francis M. Callahan collaborates with scholars based in . Francis M. Callahan's co-authors include George W. Anderson, Rolf Paul, Bernard D. Johnson, Lawrence W. Torley, J. William Hanifin, William Hallett, John A. Brockman, Robert H. Lenhard, Robert E. Schaub and Allan Wissner and has published in prestigious journals such as Journal of the American Chemical Society, Journal of Medicinal Chemistry and The Journal of Organic Chemistry.

In The Last Decade

Francis M. Callahan

11 papers receiving 2.0k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

The Use of Esters of N-Hydroxysuccinimide in Peptide Synthesis

1964 1.1k citations George W. Anderson, Francis M. Callahan et al. Journal of the American Chemical Society profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Francis M. Callahan	10	1.6k	1.0k	329	236	172	11	2.3k
Agnes Bodánszky United States	17	1.3k 0.8×	697 0.7×	260 0.8×	153 0.6×	184 1.1×	41	1.9k
Johannes Meienhofer United States	31	2.5k 1.5×	1.3k 1.3×	391 1.2×	341 1.4×	262 1.5×	102	3.6k
Nobuo Izumiya Japan	23	2.2k 1.3×	807 0.8×	330 1.0×	176 0.7×	149 0.9×	248	2.7k
Frederick W. Holly United States	23	1.2k 0.8×	786 0.8×	115 0.3×	177 0.8×	149 0.9×	57	2.0k
Hans‐Dieter Jakubke Germany	25	2.4k 1.5×	1.1k 1.1×	270 0.8×	544 2.3×	128 0.7×	144	2.9k
B. CASTRO France	20	1.6k 1.0×	890 0.9×	154 0.5×	182 0.8×	186 1.1×	63	2.1k
Roger W. Roeske United States	26	1.8k 1.1×	411 0.4×	208 0.6×	241 1.0×	154 0.9×	58	2.5k
Grace Han United States	9	1.3k 0.8×	603 0.6×	210 0.6×	120 0.5×	101 0.6×	24	1.9k
Bertrand Castro France	29	1.7k 1.0×	1.1k 1.1×	177 0.5×	211 0.9×	186 1.1×	76	2.5k
Leon H. Zalkow United States	25	1.4k 0.9×	633 0.6×	111 0.3×	315 1.3×	128 0.7×	116	2.8k

Countries citing papers authored by Francis M. Callahan

Since Specialization

Citations

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

Fields of papers citing papers by Francis M. Callahan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Francis M. Callahan. 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 Francis M. Callahan. The network helps show where Francis M. Callahan may publish in the future.

Co-authorship network of co-authors of Francis M. Callahan

This figure shows the co-authorship network connecting the top 25 collaborators of Francis M. Callahan. A scholar is included among the top collaborators of Francis M. Callahan 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 Francis M. Callahan. Francis M. Callahan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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11 of 11 papers shown

1.

Paul, Rolf, John A. Brockman, William Hallett, et al.. (1986). ChemInform Abstract: Imidazo[1,5‐d][1,2,4]triazines as Potential Antiasthma Agents.. Chemischer Informationsdienst. 17(9). 1 indexed citations

2.

Paul, Rolf, John A. Brockman, William Hallett, et al.. (1985). Imidazo[1,5-d][1,2,4]triazines as potential antiasthma agents. Journal of Medicinal Chemistry. 28(11). 1704–1716. 21 indexed citations

3.

Anderson, George W., et al.. (1967). Reinvestigation of the mixed carbonic anhydride method of peptide synthesis. Journal of the American Chemical Society. 89(19). 5012–5017. 368 indexed citations

4.

Anderson, George W., et al.. (1967). Synthesis of N-Hydroxysuccinimide Esters of Acyl Peptides by the Mixed Anhydride Method. Journal of the American Chemical Society. 89(1). 178–178. 53 indexed citations

5.

Anderson, George W., et al.. (1966). Racemization Control in the Synthesis of Peptides by the Mixed Carbonic-Carboxylic Anhydride Method. Journal of the American Chemical Society. 88(6). 1338–1339. 43 indexed citations

6.

Anderson, George W., et al.. (1964). The Use of Esters of N-Hydroxysuccinimide in Peptide Synthesis. Journal of the American Chemical Society. 86(9). 1839–1842. 1109 indexed citations breakdown →

7.

Callahan, Francis M., et al.. (1963). The Tertiary Butyl Group as a Blocking Agent for Hydroxyl, Sulfhydryl and Amido Functions in Peptide Synthesis. Journal of the American Chemical Society. 85(2). 201–207. 74 indexed citations

8.

Anderson, George W., et al.. (1963). N-Hydroxysuccinimide Esters in Peptide Synthesis. Journal of the American Chemical Society. 85(19). 3039–3039. 245 indexed citations

9.

Paul, Rolf, George W. Anderson, & Francis M. Callahan. (1961). Some Side Reactions of Nitro-L-arginine. The Journal of Organic Chemistry. 26(9). 3347–3350. 28 indexed citations

10.

Anderson, George W. & Francis M. Callahan. (1960). t-Butyl Esters of Amino Acids and Peptides and their Use in Peptide Synthesis¹. Journal of the American Chemical Society. 82(13). 3359–3363. 247 indexed citations

11.

Anderson, George W. & Francis M. Callahan. (1958). RACEMIZATION BY THE DICYCLOHEXYLCARBODIIMIDE METHOD OF PEPTIDE SYNTHESIS. Journal of the American Chemical Society. 80(11). 2902–2903. 107 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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