Helmut G. Alt

8.7k total citations · 1 hit paper
341 papers, 7.2k citations indexed

About

Helmut G. Alt is a scholar working on Organic Chemistry, Inorganic Chemistry and Process Chemistry and Technology. According to data from OpenAlex, Helmut G. Alt has authored 341 papers receiving a total of 7.2k indexed citations (citations by other indexed papers that have themselves been cited), including 298 papers in Organic Chemistry, 176 papers in Inorganic Chemistry and 78 papers in Process Chemistry and Technology. Recurrent topics in Helmut G. Alt's work include Organometallic Complex Synthesis and Catalysis (256 papers), Synthesis and characterization of novel inorganic/organometallic compounds (100 papers) and Synthetic Organic Chemistry Methods (91 papers). Helmut G. Alt is often cited by papers focused on Organometallic Complex Synthesis and Catalysis (256 papers), Synthesis and characterization of novel inorganic/organometallic compounds (100 papers) and Synthetic Organic Chemistry Methods (91 papers). Helmut G. Alt collaborates with scholars based in Germany, United States and Brazil. Helmut G. Alt's co-authors include Alexander Köppl, Marvin D. Rausch, Wolfgang Milius, Max Herberhold, Ulf Thewalt, Lawrence B. Kool, Edmond Samuel, M. Jung, Alexander C. Filippou and Manfred Erwin Eichner and has published in prestigious journals such as Chemical Reviews, Journal of the American Chemical Society and Chemical Society Reviews.

In The Last Decade

Helmut G. Alt

336 papers receiving 6.8k 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.

Effect of the Nature of Metallocene Complexes of Group IV Metals on Their Performance in Catalytic Ethylene and Propylene Polymerization

2000 916 citations Helmut G. Alt et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Helmut G. Alt Germany	38	6.2k	3.1k	1.6k	582	402	341	7.2k
Lijin Xu China	42	3.6k 0.6×	2.3k 0.7×	431 0.3×	487 0.8×	98 0.2×	178	6.2k
John C. Gordon United States	39	2.7k 0.4×	2.8k 0.9×	712 0.4×	2.1k 3.6×	164 0.4×	157	5.9k
Yun Xiong Germany	46	4.5k 0.7×	4.1k 1.3×	181 0.1×	449 0.8×	149 0.4×	140	5.8k
Elisabeth Irran Germany	40	3.1k 0.5×	3.0k 1.0×	286 0.2×	1.9k 3.2×	151 0.4×	164	5.8k
I. Wender United States	35	1.5k 0.2×	966 0.3×	321 0.2×	945 1.6×	117 0.3×	138	4.1k
Andrew E. H. Wheatley United Kingdom	36	2.2k 0.4×	1.5k 0.5×	142 0.1×	1.2k 2.1×	83 0.2×	160	4.1k
Peter Deglmann Germany	25	1.3k 0.2×	687 0.2×	869 0.5×	835 1.4×	49 0.1×	64	3.2k
Jingen Deng China	40	3.6k 0.6×	2.3k 0.8×	280 0.2×	453 0.8×	47 0.1×	138	5.1k
Anthony F. Masters Australia	37	1.9k 0.3×	1.2k 0.4×	242 0.2×	2.2k 3.8×	403 1.0×	205	5.4k
Xiao‐Ping Cao China	34	1.9k 0.3×	385 0.1×	277 0.2×	993 1.7×	199 0.5×	176	4.2k

Countries citing papers authored by Helmut G. Alt

Since Specialization

Citations

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

Fields of papers citing papers by Helmut G. Alt

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Helmut G. Alt. 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 Helmut G. Alt. The network helps show where Helmut G. Alt may publish in the future.

Co-authorship network of co-authors of Helmut G. Alt

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

All Works

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20 of 20 papers shown

Alt, Helmut G., et al.. (2020). Halogen substituted iron(III) di(imino)pyridine complexes as catalysts for 1- pentene/1-hexene co-oligomerization reactions. SHILAP Revista de lepidopterología. 4 indexed citations

Alt, Helmut G., et al.. (2019). Homogeneous and heterogeneous oligomerization reactions of olefins with unbridged metallocene catalysts. SHILAP Revista de lepidopterología. 6 indexed citations

Alt, Helmut G.. (2015). Intelligent catalysts for ethylene oligomerization and polymerization. SHILAP Revista de lepidopterología. 5 indexed citations

Alt, Helmut G., et al.. (2014). Dissymmetric dinuclear transition metal complexes as dual site catalysts for the polymerization of ethylene. SHILAP Revista de lepidopterología. 3 indexed citations

Alt, Helmut G., et al.. (2008). Influence of triphenylphosphine on the activity of heterogeneous iridium, rhodium and platinum containing catalysts for the dehydrogenation of saturated hydrocarbons. Journal of Organometallic Chemistry. 694(7-8). 1001–1010. 6 indexed citations

Alt, Helmut G.. (2005). Self-immobilizing catalysts and cocatalysts for olefin polymerization. Dalton Transactions. 3271–3271. 45 indexed citations

Alt, Helmut G., et al.. (2002). Dinuclear ansa zirconocene complexes containing a sandwich and a half-sandwich moiety as catalysts for the polymerization of ethylene. Journal of Organometallic Chemistry. 658(1-2). 259–265. 40 indexed citations

Alt, Helmut G.. (2001). From the lab bench to the plant: how to commercialize a metallocene catalyst?. Macromolecular Symposia. 173(1). 65–76. 17 indexed citations

Schmidt, Roland, et al.. (2001). Synthesis and characterization of unbridged metallocene dichloride complexes with two differently mono-substituted indenyl ligands and their application as catalysts for the polymerization of ethene and propene. Journal of Molecular Catalysis A Chemical. 172(1-2). 43–65. 14 indexed citations

10.

Alt, Helmut G. & Edmond Samuel. (1998). Fluorenyl complexes of zirconium and hafnium as catalysts for olefin polymerization. Chemical Society Reviews. 27(5). 323–323. 117 indexed citations

11.

Alt, Helmut G., M. Jung, & Gerald Kehr. (1998). C1-verbrückte Fluorenyliden–Indenylidenkomplexe des Typs (C13H8–CR2–C9H6−nR′n)ZrCl2 (n=0, 1; R=Me, Ph, Butenyl; R′=Alkyl, Alkenyl) als Metallocenkatalysatorvorstufen für die Ethylenpolymerisation. Journal of Organometallic Chemistry. 562(2). 153–181. 38 indexed citations

12.

Alt, Helmut G.. (1987). Die Stellung des Zentralkomitees der SED im politischen System der DDR. 1 indexed citations

13.

Alt, Helmut G., et al.. (1987). Reaktionen der substituierten metallacyclischen Alkenylketon-Komplexe Cp*(CO)2M[R1CCR2C(O)Me] (M = Cr, Mo, W; Cp* = η5-C5Me5; R1, R2 = H, Me,Ph) mit Stickstoffmonoxid und Nitrosylchlorid. Journal of Organometallic Chemistry. 336(3). 361–370. 4 indexed citations

14.

Kool, Lawrence B., et al.. (1985). Structural and spectroscopic comparison of the complexes Cp2M(PMe3)(CO) (M = Ti, Zr, Hf), (C9H7)2Ti(PMe3)(CO) and Cp2TiCl(PMe3); X-ray structures of Cp2Ti(PMe3)(CO) and Cp2TiCl(PMe3). Journal of Organometallic Chemistry. 297(2). 159–169. 33 indexed citations

15.

Alt, Helmut G.. (1984). Photochemie von Alkyl‐Übergangsmetallkomplexen. Angewandte Chemie. 96(10). 752–769. 15 indexed citations

16.

Alt, Helmut G.. (1984). Photochemistry of Alkyltransition‐Metal Complexes. Angewandte Chemie International Edition in English. 23(10). 766–782. 28 indexed citations

17.

Sieber, Werner, et al.. (1983). Erzeugung und Stabilisierung von Phosphanyl- und Arsanyl - ketenen in der Koordinationssph�re von Wolfram. Angewandte Chemie International Edition. 22(S2). 148–155. 5 indexed citations

18.

Alt, Helmut G., et al.. (1982). Thermische und Photo-induzierte Substitutionsreaktionen an der Eisen-ethyl-Verbindung CpFe(CO)₂Et. Die Molekülstruktur von CpFe(PMe₃)₂COEt (Cp =η⁵-C₅H₅)/ Thermal and Photo-Induced Substitution Reactions of the Iron Ethyl Compound CpFe(CO)₂Et. The Molecular Structure of CpFe(PMe₃)₂COEt (Cp = η⁵-C₅H₅). Zeitschrift für Naturforschung B. 37(9). 1109–1115. 14 indexed citations

19.

Alt, Helmut G., et al.. (1982). Neue Wolfram‐Alkyl‐ und ‐Acylkomplexe mit Acetylen als Vierelektronenligand. Angewandte Chemie. 94(11). 868–868. 18 indexed citations

20.

Rausch, Marvin D., et al.. (1977). The Photochemically-Induced Degradation of (η⁵-C₅H₅)M(CO)₃CH₃ Complexes (M = Cr, Mo, W). Zeitschrift für Naturforschung B. 32(9). 998–1000. 21 indexed citations

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