Jan Čejka

1.6k total citations
120 papers, 1.3k citations indexed

About

Jan Čejka is a scholar working on Organic Chemistry, Spectroscopy and Molecular Biology. According to data from OpenAlex, Jan Čejka has authored 120 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 44 papers in Organic Chemistry, 25 papers in Spectroscopy and 23 papers in Molecular Biology. Recurrent topics in Jan Čejka's work include Crystallography and molecular interactions (14 papers), Crystallization and Solubility Studies (10 papers) and Molecular Sensors and Ion Detection (10 papers). Jan Čejka is often cited by papers focused on Crystallography and molecular interactions (14 papers), Crystallization and Solubility Studies (10 papers) and Molecular Sensors and Ion Detection (10 papers). Jan Čejka collaborates with scholars based in Czechia, United States and Russia. Jan Čejka's co-authors include Karel Kithier, Eliška Skořepová, Martin Babor, Bohumil Kratochvíl, Ján Rohlíček, L Fleischmann, Z. Vodrážka, M. D. Poulik, Bohumil Dolenský and Jaroslav Kvı́čala and has published in prestigious journals such as Blood, American Journal of Clinical Nutrition and The Journal of Clinical Endocrinology & Metabolism.

In The Last Decade

Jan Čejka

109 papers receiving 1.3k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Jan Čejka Czechia 19 350 261 251 178 173 120 1.3k
M. Tichý Czechia 22 596 1.7× 232 0.9× 260 1.0× 248 1.4× 66 0.4× 147 1.6k
Fábio C. Tucci United States 29 1.1k 3.1× 529 2.0× 167 0.7× 283 1.6× 127 0.7× 101 2.6k
Junko Nakamura Japan 24 362 1.0× 516 2.0× 278 1.1× 215 1.2× 54 0.3× 108 1.7k
Syed A. A. Rizvi United States 18 480 1.4× 350 1.3× 377 1.5× 294 1.7× 68 0.4× 36 1.8k
Nina C. Gonnella United States 26 731 2.1× 652 2.5× 171 0.7× 251 1.4× 77 0.4× 68 1.8k
François‐Yves Dupradeau France 14 321 0.9× 896 3.4× 226 0.9× 136 0.8× 57 0.3× 30 1.4k
Karl A. Koehler United States 19 149 0.4× 693 2.7× 176 0.7× 229 1.3× 159 0.9× 72 1.2k
V. D. Gupta India 23 257 0.7× 720 2.8× 244 1.0× 209 1.2× 52 0.3× 158 1.8k
Richard G. Hiskey United States 22 564 1.6× 820 3.1× 207 0.8× 292 1.6× 200 1.2× 127 1.7k
Ulrich Bürger Switzerland 21 849 2.4× 373 1.4× 125 0.5× 120 0.7× 814 4.7× 120 3.1k

Countries citing papers authored by Jan Čejka

Since Specialization
Citations

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

Fields of papers citing papers by Jan Čejka

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Jan Čejka

This figure shows the co-authorship network connecting the top 25 collaborators of Jan Čejka. A scholar is included among the top collaborators of Jan Čejka 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 Jan Čejka. Jan Čejka 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.
Čejka, Jan, et al.. (2025). Synthesis of Monothiacalix[4]arene Using the Fragment Condensation Approach. Molecules. 30(15). 3145–3145.
2.
Čejka, Jan, et al.. (2024). Reactivity of phenoxathiin-based thiacalixarenes towards C-nucleophiles. RSC Advances. 14(19). 13463–13473. 1 indexed citations
3.
Cvačka, Josef, et al.. (2024). Modified aryldifluorophenylsilicates with improved activity and selectivity in nucleophilic fluorination of secondary substrates. RSC Advances. 14(31). 22326–22334. 1 indexed citations
4.
Blahut, Jan, Jan Čejka, Sille Štěpánová, et al.. (2024). The Hydrogen‐Bond Continuum in the Salt/Cocrystal Systems of Quinoline and Chloro‐Nitrobenzoic Acids. Chemistry - A European Journal. 30(68). e202402946–e202402946. 5 indexed citations
5.
Kvı́čala, Jaroslav, et al.. (2023). Non‐Symmetrical Tetrafluoroalkadienes Synthesized by ROCM of 3,3,4,4‐Tetrafluorocyclobutene. Chemistry - A European Journal. 29(34). e202300435–e202300435. 1 indexed citations
6.
Cvačka, Josef, et al.. (2023). Quaternary ammonium fluorides and difluorosilicates as nucleophilic fluorination reagents. Organic & Biomolecular Chemistry. 22(5). 1047–1056. 3 indexed citations
7.
Jurásek, Bronislav, Bohumil Dolenský, Radek Jurok, et al.. (2023). A structural spectroscopic study of dissociative anaesthetic methoxphenidine. New Journal of Chemistry. 47(9). 4543–4551.
8.
Jurásek, Bronislav, et al.. (2020). New psychoactive substances on dark web markets: From deal solicitation to forensic analysis of purchased substances. Drug Testing and Analysis. 13(1). 156–168. 10 indexed citations
9.
Babor, Martin, et al.. (2019). Microbatch under-oil salt screening of organic cations: single-crystal growth of active pharmaceutical ingredients. IUCrJ. 6(1). 145–151. 12 indexed citations
10.
Pohl, Radek, et al.. (2013). Direct C–H sulfenylation of purines and deazapurines. Organic & Biomolecular Chemistry. 11(31). 5189–5189. 59 indexed citations
11.
Urbanová, Martina, Adriana Šturcová, Jiřı́ Brus, et al.. (2013). Characterizing Crystal Disorder of Trospium Chloride: A Comprehensive,13C CP/MAS NMR, DSC, FTIR, and XRPD Study. Journal of Pharmaceutical Sciences. 102(4). 1235–1248. 14 indexed citations
12.
Dolenský, Bohumil, Jaroslav Kvı́čala, Oldřich Paleta, et al.. (2010). Trifluoromethylated (tetrahydropyrrolo) quinazolinones by a new three‐component reaction and facile assignment of the regio‐ and stereoisomers formed by NMR spectroscopy. Magnetic Resonance in Chemistry. 48(5). 375–385. 6 indexed citations
13.
Valı́k, Martin, Jan Čejka, Martin Havlík, Vladimı́r Král, & Bohumil Dolenský. (2007). calix-Tris-Tröger's bases – a new cavitand family. Chemical Communications. 3835–3835. 21 indexed citations
14.
Bouř, Petr, et al.. (2004). Restricted Conformational Flexibility of Furanose Derivatives:  Ab Initio Interpretation of Their Nuclear Spin−Spin Coupling Constants. The Journal of Physical Chemistry A. 108(30). 6365–6372. 15 indexed citations
15.
Jegorov, Alexandr, Zdeněk Horák, Jan Čejka, Bohumil Kratochvíl, & Ivana Cı́sařová. (2003). Pergolide mesylate form II. Acta Crystallographica Section C Crystal Structure Communications. 59(10). o575–o576.
16.
Čejka, Jan, Bohumil Kratochvíl, Ivana Cı́sařová, & Alexandr Jegorov. (2003). Simvastatin. Acta Crystallographica Section C Crystal Structure Communications. 59(8). o428–o430. 21 indexed citations
17.
Kithier, Karel, et al.. (1994). Developmental Changes of Adenocarcinoma-Associated Antigen. Fetal Diagnosis and Therapy. 9(1). 29–34.
18.
Čejka, Jan & Karel Kithier. (1976). A simple method for the classification and typing of monoclonal immunoglobulins. Immunochemistry. 13(7). 629–631. 9 indexed citations
19.
Take, Hiromichi, et al.. (1974). Immunoglobulins in acute leukemia in children. The Journal of Pediatrics. 85(6). 788–791. 38 indexed citations
20.
Vodrážka, Z., et al.. (1967). The structural basis of polymorphism of rat haemoglobin.. PubMed. 16(6). 543–7. 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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