R. Helder

639 total citations
11 papers, 436 citations indexed

About

R. Helder is a scholar working on Organic Chemistry, Spectroscopy and Pharmaceutical Science. According to data from OpenAlex, R. Helder has authored 11 papers receiving a total of 436 indexed citations (citations by other indexed papers that have themselves been cited), including 8 papers in Organic Chemistry, 4 papers in Spectroscopy and 2 papers in Pharmaceutical Science. Recurrent topics in R. Helder's work include Organic Chemistry Cycloaddition Reactions (4 papers), Analytical Chemistry and Chromatography (3 papers) and Asymmetric Synthesis and Catalysis (2 papers). R. Helder is often cited by papers focused on Organic Chemistry Cycloaddition Reactions (4 papers), Analytical Chemistry and Chromatography (3 papers) and Asymmetric Synthesis and Catalysis (2 papers). R. Helder collaborates with scholars based in Netherlands. R. Helder's co-authors include Hans Wynberg, Jan C. Hummelen, Henk Hiemstra, B. Zwanenburg, J. Strating, David N. Reinhoudt and H. C. Volger and has published in prestigious journals such as Tetrahedron, Tetrahedron Letters and Recueil des Travaux Chimiques des Pays-Bas.

In The Last Decade

R. Helder

11 papers receiving 413 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
R. Helder Netherlands	10	389	109	82	70	48	11	436
Gregory G. Graboski	4	448 1.2×	59 0.5×	92 1.1×	37 0.5×	32 0.7×	4	489
G. ROUSSEAU France	13	324 0.8×	41 0.4×	109 1.3×	59 0.8×	33 0.7×	26	411
Richard T. Arnold United States	12	300 0.8×	74 0.7×	62 0.8×	52 0.7×	36 0.8×	28	391
Layton L. McCoy United States	11	299 0.8×	63 0.6×	52 0.6×	54 0.8×	32 0.7×	23	402
William A. White United Kingdom	8	399 1.0×	68 0.6×	104 1.3×	31 0.4×	21 0.4×	11	464
James R. Matz United States	12	388 1.0×	72 0.7×	54 0.7×	32 0.5×	31 0.6×	15	451
G. Hagen Germany	11	360 0.9×	60 0.6×	72 0.9×	73 1.0×	34 0.7×	15	443
D. Seebach Germany	6	387 1.0×	54 0.5×	146 1.8×	48 0.7×	20 0.4×	12	472
Lung Huang Kuo United States	10	427 1.1×	98 0.9×	92 1.1×	91 1.3×	49 1.0×	11	506
F. Gaviña Spain	13	329 0.8×	53 0.5×	89 1.1×	49 0.7×	69 1.4×	27	401

Countries citing papers authored by R. Helder

Since Specialization

Citations

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

Fields of papers citing papers by R. Helder

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of R. Helder

This figure shows the co-authorship network connecting the top 25 collaborators of R. Helder. A scholar is included among the top collaborators of R. Helder 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 R. Helder. R. Helder 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.

Helder, R., et al.. (1977). Alkaloid catalyzed asymmetric synthesis III the addition of mercaptans to 2-cyclohexene-1-one; determination of enantiomeric excess using 13C NMR.. Tetrahedron Letters. 18(25). 2181–2182. 54 indexed citations

2.

Helder, R., et al.. (1976). The resolution of heterohelicenes, a facile method using HPLC: (Preliminary communication). Recueil des Travaux Chimiques des Pays-Bas. 95(9). 211–212. 25 indexed citations

3.

Helder, R., et al.. (1976). Catalytic asymmetric induction in oxidation reactions. The synthesis of optically active epoxides.. Tetrahedron Letters. 17(21). 1831–1834. 124 indexed citations

4.

Helder, R. & Hans Wynberg. (1975). The t-butylation of |8|(2,5)thiophenophane. Tetrahedron. 31(20). 2551–2557. 7 indexed citations

5.

Wynberg, Hans & R. Helder. (1975). Asymmetric induction in the alkaloid-catalysed Michael reaction. Tetrahedron Letters. 16(46). 4057–4060. 130 indexed citations

6.

Helder, R. & Hans Wynberg. (1973). The diels-alder addition of dicyanoacetylene to [8] (2,5)furanophane; the synthesis of a paddlane. Tetrahedron Letters. 14(44). 4321–4324. 11 indexed citations

7.

Helder, R., et al.. (1973). Reactions of diazomethane with sulfonyl-activated double bonds. Tetrahedron. 29(10). 1375–1378. 16 indexed citations

8.

Reinhoudt, David N., et al.. (1972). [2+2]cycloaddition of substituted thiophenes to acetylenes. Tetrahedron Letters. 13(52). 5269–5272. 17 indexed citations

9.

Wynberg, Hans & R. Helder. (1972). A one-step ring enlargement of a thiophene to a thiepin. Tetrahedron Letters. 13(35). 3647–3650. 10 indexed citations

10.

Helder, R. & Hans Wynberg. (1972). The diels-alder reaction of thiophene. Tetrahedron Letters. 13(7). 605–608. 31 indexed citations

11.

Wynberg, Hans & R. Helder. (1971). The synthesis of [2.2](9,10)anthraceno(2,5)furanophane and its reaction with dimethyl acetylenedicarboxylate.. Tetrahedron Letters. 12(45). 4317–4320. 11 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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