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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Chemistry 50 14293 1040 408 10141

Rolf Appel publications per year

The chart shows the history of publications by Rolf Appel between 1951 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Rolf Appel published across 75 years, from 1951 to 2025, averaging 5.6 papers a year. Output peaked at 53 publications in 1975. 1 of the 418 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1951 to 2025. Vertical axis: number of publications, 0 to 53. Peak 53 publications in 1975. 1951: 1 publication 1952: 0 publications 1953: 2 publications 1954: 2 publications 1955: 0 publications 1956: 3 publications 1957: 0 publications 1958: 4 publications 1959: 13 publications 1960: 2 publications 1961: 4 publications 1962: 9 publications 1963: 1 publication 1964: 4 publications 1965: 2 publications 1966: 4 publications 1967: 1 publication 1968: 7 publications 1969: 6 publications 1970: 17 publications 1971: 27 publications 1972: 13 publications 1973: 14 publications 1974: 22 publications 1975: 53 publications 1976: 32 publications 1977: 19 publications 1978: 6 publications 1979: 16 publications 1980: 8 publications 1981: 20 publications 1982: 12 publications 1983: 15 publications 1984: 14 publications 1985: 12 publications 1986: 15 publications 1987: 12 publications 1988: 13 publications 1989: 3 publications 1990: 1 publication 1991: 1 publication 1992: 0 publications 1993: 0 publications 1994: 0 publications 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 0 publications 1999: 0 publications 2000: 0 publications 2001: 0 publications 2002: 0 publications 2003: 0 publications 2004: 0 publications 2005: 0 publications 2006: 5 publications 2007: 1 publication 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 0 publications 2012: 0 publications 2013: 0 publications 2014: 1 publication 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 0 publications 2020: 0 publications 2021: 0 publications 2022: 0 publications 2023: 0 publications 2024: 0 publications 2025: 1 publication
1951 2025

418 publications in total across all disciplines

View publications per year as a table
Rolf Appel: publications per year, 1951 to 2025
Year Publications
1951 1
1952 0
1953 2
1954 2
1955 0
1956 3
1957 0
1958 4
1959 13
1960 2
1961 4
1962 9
1963 1
1964 4
1965 2
1966 4
1967 1
1968 7
1969 6
1970 17
1971 27
1972 13
1973 14
1974 22
1975 53
1976 32
1977 19
1978 6
1979 16
1980 8
1981 20
1982 12
1983 15
1984 14
1985 12
1986 15
1987 12
1988 13
1989 3
1990 1
1991 1
1992 0
1993 0
1994 0
1995 0
1996 0
1997 0
1998 0
1999 0
2000 0
2001 0
2002 0
2003 0
2004 0
2005 0
2006 5
2007 1
2008 0
2009 0
2010 0
2011 0
2012 0
2013 0
2014 1
2015 0
2016 0
2017 0
2018 0
2019 0
2020 0
2021 0
2022 0
2023 0
2024 0
2025 1
Total 418
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Rolf Appel publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Rolf Appel sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 401–420 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 408 publications — 81st percentile

81% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397 408
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Rolf Appel D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Rolf Appel sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 50–51 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 50 D-Index — 21st percentile

21% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861 50
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Research.com Recognitions

  • 1986 - Liebig-Denkmünze (Liebig Medal), Society of German Chemists

Overview

Rolf Appel was affiliated with the University of Bonn in Germany during their scientific career. Their research spanned several interconnected fields, mainly focusing on biochemical, genetic, and molecular biology aspects as well as agricultural and biological sciences and medicine.

Their scientific contributions were notably situated within subfields such as physiology, aquatic science, and reproductive medicine. This interdisciplinary focus was reflected in their work on reproductive biology and its impacts on aquatic species, aquaculture nutrition and growth, and sperm and testicular function.

Among their identified research topics were:

  • Reproductive biology and impacts on aquatic species
  • Aquaculture Nutrition and Growth
  • Sperm and Testicular Function

Rolf Appel published in the venue Animal Reproduction Science, contributing once to this journal. The documented paper titled "Addition of antioxidant uric acid in extender for Nile tilapia (Oreochromis niloticus) sperm cryopreservation" appeared in 2025. The paper addressed aspects of sperm preservation in fish species, relevant to both reproductive biology and aquaculture development.

Their frequent co-authors included Vinícius Wagner Silva, Myrian Megumy Tsunokawa Hidalgo, Karine Nicole Siqueira, Laurival A. Vilas-Bôas, and Lucienne Garcia Pretto-Giordano. Each collaboration represented a single joint publication, highlighting a collaborative research network focused on related scientific questions.

During their career, Rolf Appel was recognized with the Liebig-Denkmünze (Liebig Medal) awarded by the Society of German Chemists in 1986.

Best Publications

  • Tertiary Phosphane/Tetrachloromethane, a Versatile Reagent for Chlorination, Dehydration, and P ? N Linkage

    Rolf Appel

  • Tertiäres Phosphan/Tetrachlormethan, ein vielseitiges Reagens zur Chlorierung, Dehydratisierung und PN‐Verknüpfung

    Rolf Appel

  • Phospha‐alkenes and Phospha‐alkynes, Genesis and Properties of the (p‐p)π‐Multiple Bond

    Rolf Appel;Fritz Knoll;Ingo Ruppert

  • Phospha‐alkene und Phospha‐alkine, Genese und Charakteristika ihrer (p‐p)π‐Mehrfachbindung

    Rolf Appel;Fritz Knoll;Ingo Ruppert

  • Novel Nickel- and Palladium-Complexes with Aminobis(imino)phosphorane Ligands for the Polymerization of Ethylene

    Wilhelm Keim;Rolf Appel;Arnold Storeck;Carl Krüger

  • (CH3)3SiCP, ein silylfunktionelles phospha-alkin

    Rolf Appel;Axel Westerhaus

  • New Preparation of Isocyanides

    Rolf Appel;Roland Kleinstück;Klaus-Dieter Ziehn

  • Niederkoordinierte Phosphor‐Verbindungen, 17. Diphosphabutadiene

    Unknown

  • Darstellung silylierter Alkylen‐bisiminophosphorane und ihre Cyclisierung mit Phosphor(V)‐fluoriden

    Unknown

  • Über ein neues Darstellungsverfahren und eine ungewöhnliche Spaltung der Methylenbis(diorganylphosphane) durch Alkalimetalle

    Unknown

  • Das erste phospha-keten , spektroskopischer nachweis und folgereaktionen.

    Rolf Appel;Wilfried Paulen

  • Über die gemeinsame Einwirkung von Phosphinen und Tetrachlorkohlenstoff auf Ammoniak (Derivate), IV. Notiz über eine neue Carbodiimid‐Synthese

    Unknown

  • Neues Verfahren zur Darstellung von Isocyaniden

    Rolf Appel;Roland Kleinstück;Klaus‐Dieter Ziehn

  • The First Organodithioxophosphorane

    Rolf Appel;Falk Knoch;Holger Kunze

  • Ringöffnung durch [3,3]‐Diphospha‐Cope‐Umlagerung

    Rolf Appel;Johannes Hünerbein;Falk Knoch

  • Das erste Organodithioxophosphoran

    Rolf Appel;Falk Knoch;Holger Kunze

  • Niederkoordinierte Phosphorverbindungen, 56 Valenzisomerisierung eines 3,4‐Diphospha‐1,5‐hexadiins zu einem 3,4‐Bis(phosphamethylen)‐1‐cyclobuten

    Rolf Appel;Volker Winkhaus;Falk Knoch

  • Zur Kenntnis des Imins, III. Phosphin‐iminium‐chloride und Triphenylphosphin‐imin

    Unknown

  • Neuartige Nickel- und Palladium-Komplexe mit Aminobis(imino)phosphoran-Liganden zur Polymerisation von Ethylen

    Wilhelm Keim;Rolf Appel;Arnold Storeck;Carl Krüger

  • Ph(Me3Si)CPCl, the First P‐Halofunctionalized Methylenephosphane

    Rolf Appel;Axel Westerhaus

  • The First Stable Phosphaketene

    Rolf Appel;Wilfried Paulen

  • Asymmetric Michael additions via SAMP-/RAMP-hydrazones anti-diastereo- and enantioselective synthesis of 3,4-disubstituted 5-oxo-alkanoates

    Dieter Enders;Kyriakos Papadopoulos;Beatrice E.M Rendenbach;Rolf Appel

  • Easy Synthesis of Phosphaalkenes by a Phosphorus‐Analogous Isocyanide Reaction and an Atypical Crystal Structure of a Tetracarbonyl(phosphaalkene)iron Complex

    Rolf Appel;Carl Casser;Michael Immenkeppel;Falk Knoch

  • A New 1,3‐Diphosphaallylnickel Complex for the Polymerization of Ethene

    Wilhelm Keim;Rolf Appel;Stefan Gruppe;Falk Knoch

  • Ph(Me3Si)CPCl, das ersteP-halogenfunktionalisierte Methylenphosphan

    Rolf Appel;Axel Westerhaus

  • Niederkoordinierte Phosphorverbindungen. 58. Synthese und Reaktivität der 2, 4, 6-Tri-tert-butylphenyl (halogenmethylen)phosphane†

    Rolf Appel;Michael Immenkeppel

  • 1,4‐Diphospha‐1,3‐butadiene

    Rolf Appel;Johannes Hünerbein;Nikolaos Siabalis

  • Synthesis of the First Triphosphabutadiene

    Rolf Appel;Bärbel Niemann;Winfried Schuhn;Falk Knoch

Frequent Co-Authors

Hans Bock
Hans Bock Goethe University Frankfurt
Wilhelm Keim
Wilhelm Keim RWTH Aachen University
Martin Nieger
Martin Nieger University of Helsinki
Richard Goddard
Richard Goddard Max Planck Society
Gottfried Huttner
Gottfried Huttner Heidelberg University
Günther Maier
Günther Maier University of Giessen
Hans Peter Reisenauer
Hans Peter Reisenauer University of Giessen
Carl Krüger
Carl Krüger Max Planck Society

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