Maurice Shamma

7.1k total citations
313 papers, 5.2k citations indexed

About

Maurice Shamma is a scholar working on Organic Chemistry, Pharmacology and Pharmacology. According to data from OpenAlex, Maurice Shamma has authored 313 papers receiving a total of 5.2k indexed citations (citations by other indexed papers that have themselves been cited), including 177 papers in Organic Chemistry, 96 papers in Pharmacology and 94 papers in Pharmacology. Recurrent topics in Maurice Shamma's work include Chemical synthesis and alkaloids (93 papers), Berberine and alkaloids research (81 papers) and Alkaloids: synthesis and pharmacology (78 papers). Maurice Shamma is often cited by papers focused on Chemical synthesis and alkaloids (93 papers), Berberine and alkaloids research (81 papers) and Alkaloids: synthesis and pharmacology (78 papers). Maurice Shamma collaborates with scholars based in United States, Chile and Pakistan. Maurice Shamma's co-authors include Alan J. Freyer, Jerome L. Moniot, Víctor Fajardo, Hélène Guinaudeau, Belkıs Gözler, Emir Valencia, Gábor Blaskó, Tekant Gözler, Saddam Hussain and Eugene E. Van Tamelen and has published in prestigious journals such as Chemical Reviews, Journal of the American Chemical Society and Journal of Medicinal Chemistry.

In The Last Decade

Maurice Shamma

307 papers receiving 4.8k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Maurice Shamma United States 33 2.9k 1.7k 1.3k 1.2k 957 313 5.2k
Hiroshi Kakisawa Japan 31 3.1k 1.1× 2.4k 1.5× 1.7k 1.3× 422 0.3× 609 0.6× 168 6.5k
Ernest Wenkert United States 51 6.5k 2.3× 3.3k 2.0× 849 0.7× 1.6k 1.3× 896 0.9× 386 10.4k
Tetsuji Kametani Japan 33 5.6k 1.9× 1.9k 1.1× 867 0.7× 830 0.7× 543 0.6× 976 6.9k
Robert B. Bates United States 37 1.9k 0.6× 2.0k 1.2× 430 0.3× 710 0.6× 524 0.5× 211 5.0k
Kanki Komiyama Japan 39 2.4k 0.8× 1.9k 1.1× 1.2k 0.9× 1.2k 1.0× 521 0.5× 184 5.0k
Joachim Stöckigt Germany 36 1.8k 0.6× 2.9k 1.7× 1.1k 0.8× 1.4k 1.1× 435 0.5× 169 4.9k
Alan J. Freyer United States 32 2.6k 0.9× 1.2k 0.7× 855 0.7× 381 0.3× 343 0.4× 135 4.1k
Robert M. Coates United States 46 2.1k 0.7× 4.4k 2.6× 2.1k 1.6× 431 0.4× 211 0.2× 194 6.7k
D. Arigoni Germany 40 1.3k 0.4× 4.6k 2.7× 1.2k 0.9× 345 0.3× 420 0.4× 152 6.4k
Keiichiro Fukumoto Japan 35 4.9k 1.7× 1.4k 0.8× 610 0.5× 736 0.6× 405 0.4× 551 5.8k

Countries citing papers authored by Maurice Shamma

Since Specialization
Citations

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

Fields of papers citing papers by Maurice Shamma

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Maurice Shamma

This figure shows the co-authorship network connecting the top 25 collaborators of Maurice Shamma. A scholar is included among the top collaborators of Maurice Shamma 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 Maurice Shamma. Maurice Shamma 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.
Amin, A.R.M. Ruhul, et al.. (2011). The Alkaloids of Machilus Duthei. Journal of the chemical society of pakistan. 2(4). 157.
2.
Hussain, Saddam, Víctor Fajardo, & Maurice Shamma. (1989). (-)-Natalamine, an Aporphinoid Alkaloid from Berberis empetrifolia. Journal of Natural Products. 52(3). 644–645. 4 indexed citations
3.
Tojo, Emília, Musa H. Abu Zarga, Salim S. Sabri, Alan J. Freyer, & Maurice Shamma. (1989). The Homoaporphine Alkaloids of Androcymbium palaestinum. Journal of Natural Products. 52(5). 1055–1059. 5 indexed citations
4.
Parvez, Masood, Víctor Fajardo, & Maurice Shamma. (1988). (+)-Jaborosalactone M, a hemiketal withanolide from Jaborosa magellanica. Acta Crystallographica Section C Crystal Structure Communications. 44(3). 553–555. 5 indexed citations
5.
Shamma, Maurice. (1985). , A. Brossi (Ed.). Academic Press, Orlando, FL (1984), , cm. ISBN 0-12-469523-X. $85.00 (£ 59.50). Journal of Pharmaceutical Sciences. 74(7). 1 indexed citations
6.
Valencia, Emir, et al.. (1984). Dihydrorugosinone, a Pseudobenzylisoquinoline Alkaloid From Berberis darwinii and Berberis actinacantha. Journal of Natural Products. 47(6). 1050–1051. 6 indexed citations
7.
Shamma, Maurice, et al.. (1983). Chiloenamine and chiloenine: two unusual isoquinoline derived alkaloids. A new insight into the catabolism of aporphines. Journal of the Chemical Society Chemical Communications. 799–800. 4 indexed citations
8.
Guinaudeau, Hélène, Maurice Shamma, & K. Hüsnü Can Başer. (1982). (+)-N-2'-Noradiantifoline: A New Aporphine-Benzylisoquinoline Alkaloid. Journal of Natural Products. 45(4). 505–506. 1 indexed citations
9.
Miana, Ghulam Abbas, et al.. (1979). Baluchistine, a new bisbenzylisoquinoline alkaloid. Cellular and Molecular Life Sciences. 35(9). 1137–1138. 6 indexed citations
10.
Moniot, Jerome L., et al.. (1979). Chemistry of highly oxidized aporhoeadanes. The Journal of Organic Chemistry. 44(24). 4347–4351. 30 indexed citations
11.
Shamma, Maurice, et al.. (1977). A one-step conversion of isoquinolinium salts into naphthalene derivatives. Tetrahedron. 33(22). 2907–2911.
12.
Shamma, Maurice, et al.. (1976). Peshawarine, an Unusual Isoquinoline Alkaloid. Heterocycles. 5(1). 41–41. 6 indexed citations
13.
Shamma, Maurice, et al.. (1975). A one-step conversion of isoquinolinium salts into naphthalene derivatives. Tetrahedron Letters. 16(44). 3803–3806. 3 indexed citations
14.
Shamma, Maurice & Jerome L. Moniot. (1974). Pennsylvanine and pennsylvanamine, two new dimeric isoquinoline alkaloids. Tetrahedron Letters. 15(26). 2291–2294. 4 indexed citations
15.
Shamma, Maurice, et al.. (1972). Two isoquinoline alkaloids with a methylenoxy-bridge. Journal of the Chemical Society Chemical Communications. 408–408. 6 indexed citations
16.
Shamma, Maurice, et al.. (1969). Thalictrum alkaloids VI: (−)-Veronamine, a glycosidic benzylisoquinoline. Tetrahedron Letters. 10(56). 4951–4954. 4 indexed citations
17.
Shamma, Maurice & B. Dudock. (1968). Thalictrum Alkaloids V. Isolation. Journal of Pharmaceutical Sciences. 57(2). 262–269. 11 indexed citations
18.
Bhacca, Norman S., et al.. (1966). The configuration and conformation of cularine. Tetrahedron. 22(4). 1467–1475. 15 indexed citations
19.
Jaret, Robert S., et al.. (1964). Deserpideine, a New Yohimbinoid Type Alkaloid. Journal of the American Chemical Society. 86(10). 2083–2084. 8 indexed citations
20.
Shamma, Maurice, et al.. (1959). The Triterpenes of Heliabravoa chende. The Journal of Organic Chemistry. 24(5). 726–728. 19 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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