1
|
Seeman JI. Why Woodward and Hoffmann? And Why 1965? CHEM REC 2023; 23:e202200239. [PMID: 36631284 DOI: 10.1002/tcr.202200239] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/16/2022] [Indexed: 01/13/2023]
Abstract
Previous publications in this series on the history of the development of the Woodward-Hoffmann rules revealed why Woodward and Hoffmann were prime candidates to solve the pericyclic no-mechanism problem. This publication explains why it was the collaborative team of R. B. Woodward and Roald Hoffmann who did solve this mechanistic problem in a series of five communications in the Journal of the American Chemical Society in 1965. That is, the reasons why Woodward and Hoffmann were the perfect team, and why their individual capabilities, experiences, and qualities provided the perfect synergy are described. In part, this was the right time and the right place for them both, but the synergies were fundamental, intrinsic and idiosyncratic as a collaborative pair. Their orbital symmetry rules provided the mechanism of all concerted pericyclic reactions including electrocyclizations, cycloadditions, and sigmatropic rearrangements. Why it was 1965 and not earlier is also discussed.
Collapse
Affiliation(s)
- Jeffrey I Seeman
- Department of Chemistry, University of Richmond, Richmond, VA 23173, USA
| |
Collapse
|
2
|
Seeman JI. Fifty Years of a Dispute. A Triptych: Why Woodward?**. CHEM REC 2022; 22:e202200150. [DOI: 10.1002/tcr.202200150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/23/2022] [Accepted: 07/25/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry University of Richmond Richmond VA 23173 USA
| |
Collapse
|
3
|
Secka J, Pal A, Acquah FA, Mooers BHM, Karki AB, Mahjoub D, Fakhr MK, Wallace DR, Okada T, Toyooka N, Kuta A, Koduri N, Herndon D, Roberts KP, Wang Z, Hileman B, Rajagopal N, Hussaini SR. Coupling of acceptor-substituted diazo compounds and tertiary thioamides: synthesis of enamino carbonyl compounds and their pharmacological evaluation. RSC Adv 2022; 12:19431-19444. [PMID: 35865562 PMCID: PMC9256013 DOI: 10.1039/d2ra02415b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/25/2022] [Indexed: 11/25/2022] Open
Abstract
This paper describes the synthesis of enamino carbonyl compounds by the copper(i)-catalyzed coupling of acceptor-substituted diazo compounds and tertiary thioamides. We plan to use this method to synthesize indolizidine (-)-237D analogs to find α6-selective antismoking agents. Therefore, we also performed in silico α6-nAchRs binding studies of selected products. Compounds with low root-mean-square deviation values showed more favorable binding free energies. We also report preliminary pharmacokinetic data on indolizidine (-)-237D and found it to have weak activity at CYP3A4. In addition, as enamino carbonyl compounds are also known for antimicrobial properties, we screened previously reported and new enamino carbonyl compounds for antibacterial, antimicrobial, and antifungal properties. Eleven compounds showed significant antimicrobial activities.
Collapse
Affiliation(s)
- Jim Secka
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Arpan Pal
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Francis A Acquah
- Department of Biochemistry and Molecular Biology, University of Oklahoma of Health Sciences Center Oklahoma City OK 73104 Unites States
- Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma Health Sciences Center Oklahoma City OK 73104 USA
- Laboratory of Biomolecular Structure and Function, University of Oklahoma of Health Sciences Center Oklahoma City OK 73104 USA
| | - Blaine H M Mooers
- Department of Biochemistry and Molecular Biology, University of Oklahoma of Health Sciences Center Oklahoma City OK 73104 Unites States
- Stephenson Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma Health Sciences Center Oklahoma City OK 73104 USA
- Laboratory of Biomolecular Structure and Function, University of Oklahoma of Health Sciences Center Oklahoma City OK 73104 USA
| | - Anand B Karki
- Department of Biological Science, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Dania Mahjoub
- Department of Biological Science, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Mohamed K Fakhr
- Department of Biological Science, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - David R Wallace
- Department of Pharmacology and Physiology, Oklahoma State University Center for Health Sciences Tulsa Oklahoma 74107 USA
| | - Takuya Okada
- Faculty of Engineering, University of Toyama 3190 Gofuku Toyama 930-8555 Japan
| | - Naoki Toyooka
- Faculty of Engineering, University of Toyama 3190 Gofuku Toyama 930-8555 Japan
| | - Adama Kuta
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Naga Koduri
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Deacon Herndon
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Kenneth P Roberts
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Zhiguo Wang
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Bethany Hileman
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Nisha Rajagopal
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| | - Syed R Hussaini
- Department of Chemistry and Biochemistry, The University of Tulsa 800 S. Tucker Drive Tulsa Oklahoma 74104 USA
| |
Collapse
|
4
|
Seeman JI. The Many Chemists Who Could Have Proposed the Woodward-Hoffmann Rules But Didn't: The Organic Chemists Who Discovered the Smoking Guns [ ]. CHEM REC 2022; 22:e202200065. [PMID: 35713274 DOI: 10.1002/tcr.202200065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/06/2022] [Indexed: 01/25/2023]
Abstract
It is a reasonable question to ask, why, as of 1965 when the five Woodward-Hoffmann communications appeared, did no other organic chemist discover the orbital symmetry rules for pericyclic reactions? Two theoretical chemists - Luitzen Oosterhoff (in 1961) and Kenichi Fukui (in 1964) had discovered portions of the orbital symmetry rules before Woodward and Hoffmann. Why not organic chemists? Indeed, perhaps the greatest motivation to discover the mechanism of a mysterious reaction is to uncover key examples of that mysterious reaction in your very own laboratory. The stories of 20 chemists and R. B. Woodward are discussed in this paper which is Paper 6 in a 27-paper series on the history of Woodward-Hoffmann rules. Social, political, and scientific explanations will also be presented as partial explanations as to why none of these individuals - except Woodward with Hoffmann - solved the pericyclic no-mechanism problem.
Collapse
Affiliation(s)
- Jeffrey I Seeman
- Department of Chemistry, University of Richmond, Richmond, VA 23173, USA
| |
Collapse
|
5
|
Seeman JI. My First and My Latest Publication
†. J PHYS ORG CHEM 2022. [DOI: 10.1002/poc.4344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
6
|
García ER, Solladié N, Galán GZ. Recent Advances on Porphyrin and Metalloporphyrin Chemistry. CURR ORG CHEM 2022. [DOI: 10.2174/138527282606220617124303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Ernesto Rivera García
- Instituto de Investigaciones en Materiales UNAM
Circuito exterior Ciudad Universitaria CP 04510
Mexico City
Mexico
| | - Nathalie Solladié
- Groupe de Synthèse de Systèmes Porphyriniques
(G2SP)
Laboratoire de Chimie de Coordination du CNRS
205 route de Narbonne 31077 Toulouse Cedex 4
France
| | - Gerardo Zaragoza Galán
- Facultad de Ciencias Químicas, Universidad
Autónoma de Chihuahua
Circuito Universitario, Campus Universitario #2,
Apartado Postal 669, Chihuahua
Chihuahua. 31125
Mexico
| |
Collapse
|
7
|
Vonlanthen M, Cuétara-Guadarrama F, Porcu P, Sorroza-Martínez K, González-Méndez I, Rivera E. Dendronized Porphyrins: Molecular Design and Synthesis. CURR ORG CHEM 2022. [DOI: 10.2174/1385272826666220126121801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
In this review, we report different methods and strategies to synthesize flexible and rigid dendronized porphyrins. We will focus on porphyrin dendrimers that have been reported in the last 10 years. Particularly, in our research group, we have designed and synthesized different series of dendronized porphyrins (free base and metallated) with pyrene units at the periphery and Fréchet-type dendritic arms. The Lindsey methodology has allowed the synthesis of meso-substituted porphyrins with various substitution patterns, such as symmetric, dissymmetric, or unsymmetric. Porphyrin dendrimers have been prepared by different synthetic methodologies; one of the most reported being the convergent method, where the dendrons are first prepared and further linked to a meso-substituted functionalized porphyrin unit, which will constitute the core of the dendrimer. Another interesting synthetic approach is the use of a reactive dendron bearing a terminal aldehyde functional group to form the final porphyrin core. In this way, a two-armed dendronized dissymmetric porphyrin core can be prepared from a dendritic precursor and a dipyrromethene derivative. This strategy is very convenient to prepare low-generation dendritic porphyrins. The divergent approach is another well-known methodology for porphyrin dendrimer synthesis, mostly used for the obtainment of high-generation dendrimers. Click chemistry reaction has been advantageous for the development of more complex porphyrin dendritic structures. This reaction presents important advantages, such as high yields and mild reaction conditions which permit the assembly of different multiporphyrin dendritic structures. In the constructs presented in this review, the emission of the porphyrin moiety has been observed, leading to potential applications in artificial photosynthesis, sensing, nanomedicine, and biological sciences.
Collapse
Affiliation(s)
- Mireille Vonlanthen
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| | - Fabián Cuétara-Guadarrama
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| | - Pasquale Porcu
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| | - Kendra Sorroza-Martínez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| | - Israel González-Méndez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| | - Ernesto Rivera
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria, C.P. 04510, Mexico City, Mexico
| |
Collapse
|
8
|
Seeman JI. The Ways of Science Through the Lens of the Woodward-Hoffmann Rules. The Stories Begin*. CHEM REC 2021; 22:e202100211. [PMID: 34862730 DOI: 10.1002/tcr.202100211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 11/08/2022]
Abstract
This is Paper 1 in a 27-paper series on the history of the development of the Woodward-Hoffmann rules, also known as the Principle of Conservation of Orbital Symmetry. In addition to presenting an outline of this series, this manuscript provides a short overview of the chemical problem eventually solved by the Woodward-Hoffmann rules is presented.
Collapse
Affiliation(s)
- Jeffrey I Seeman
- Gottwald Science Center/Department of Chemistry, 138 UR Drive, University of Richmond, Richmond, VA, 23173, USA
| |
Collapse
|
9
|
Tantillo DJ, Seeman JI. On the Structural Assignments Underlying R. B. Woodward's Most Personal Data That Led to the Woodward-Hoffmann Rules: Subramania Ranganathan's Key Role and Related Research by E. J. Corey and A. G. Hortmann. Chemistry 2021; 27:7000-7016. [PMID: 33835603 DOI: 10.1002/chem.202004790] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Revised: 01/13/2021] [Indexed: 11/09/2022]
Abstract
In the early 1960s, as part of R. B. Woodward's isoxazole route to vitamin B12 , Subramania Ranganathan uncovered two coupled sets of stereospecific reactions, a thermal set and a photochemical set. These four reactions illustrated the alternating configurations that were the major data points that prompted the solution of the no-mechanism problem. Though Ranganathan's reactions played a major role, according to Woodward, in the development of the Woodward-Hoffmann rules, they were published only as part of the documentation of a lecture given by Woodward in 1966. The authors of this paper have uncovered Subramania Ranganathan's 1964 postdoctoral report and have used modern quantum chemical theory to predict the 1 H NMR spectra for Ranganathan's key compounds, providing support for the structure assignments made by Woodward and Ranganathan. A similar set of alternating, stereospecific reactions was observed by E. J. Corey and Alfred Hortmann in their 1963 total synthesis of dihydrocostunolide. We also have applied the computational process used for Ranganathan's compounds to Hortmann's compounds, now also including the calculation of coupling constants, and find computational support for Corey and Hortmann's structure assignments.
Collapse
Affiliation(s)
- Dean J Tantillo
- Department of Chemistry, University of California-Davis, Davis, California, 95616, United States
| | - Jeffrey I Seeman
- Department of Chemistry, University of Richmond, Richmond, Virginia, 23173, United States
| |
Collapse
|
10
|
Senge MO, Sergeeva NN, Hale KJ. Classic highlights in porphyrin and porphyrinoid total synthesis and biosynthesis. Chem Soc Rev 2021; 50:4730-4789. [PMID: 33623938 DOI: 10.1039/c7cs00719a] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Porphyrins feature prominently in nature, be it as enzymatic cofactors, electron and exciton shuffles, as photoactive dyes, or as signaling substances. Their involvement in the generation, storage and use of oxygen is pivotal to life, while their photochemical properties are central to the biochemical functioning of plants. When complexed to metals, porphyrins can engage in a multitude of contemporary applications ranging from solar energy generation to serving as catalysts for important chemical reactions. They are also able to function as useful theranostic agents, and as novel materials for a wide range of applications. As such, they are widely considered to be highly valuable molecules, and it almost goes without saying that synthetic organic chemistry has dramatically underpinned all the key advances made, by providing reliable access to them. In fact, strategies for the synthesis of functionalized porphyrins have now reached a state of refinement where pretty well any desired porphyrin can successfully be synthesized with the approaches that are available, including a cornucopia of related macrocycle-modified porphyrinoids. In this review, we are going to illustrate the development of this exciting field by discussing a number of classic syntheses of porphyrins. Our coverage will encompass the natural protoporphyrins and chlorophylls, while also covering general strategies for the synthesis of unsymmetrical porphyrins and chlorins. Various industrial syntheses of porphyrins will also be discussed, as will other routes of great practical importance, and avenues to key porphyrinoids with modified macrocycles. A range of selected examples of contemporary functionalization reactions will be highlighted. The various key syntheses will be described and analyzed from a traditional mechanistic organic chemistry perspective to help student readers, and those who are new to this area. The aim will be to allow readers to mechanistically appreciate and understand how many of these fascinating ring-systems are built and further functionalized.
Collapse
Affiliation(s)
- Mathias O Senge
- School of Chemistry, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
| | | | | |
Collapse
|
11
|
Pal A, Hussaini SR. Copper-Catalyzed Coupling of Thioamides and Donor/Acceptor-Substituted Carbenoids: Synthesis of Enamino Esters and Enaminones. ACS OMEGA 2019; 4:269-280. [PMID: 31459329 PMCID: PMC6648369 DOI: 10.1021/acsomega.8b02633] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 12/20/2018] [Indexed: 06/10/2023]
Abstract
The coupling of thioamides and donor/acceptor-substituted diazocarbonyl compounds is reported for the first time. The present report provides a mild, catalytic method that couples thioamides and donor/acceptor-substituted diazocarbonyl compounds to form enamino esters and enaminones. Unlike traditional methods for the synthesis of enamino esters and enaminones from thioamides, both N-alkyl thioamides and thiocarbamates are suitable substrates in this coupling reaction. Copper(I) bromide catalyzes the reaction and provides enamino esters and enaminones chemo- and diastereoselectively in less time than Rh2(OAc)4 or Ru(PPh3)3Cl2 catalysts.
Collapse
Affiliation(s)
- Arpan Pal
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 S. Tucker Dr., Tulsa, Oklahoma 74104, United States
| | - Syed Raziullah Hussaini
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 S. Tucker Dr., Tulsa, Oklahoma 74104, United States
| |
Collapse
|
12
|
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry; University of Richmond; Richmond VA 23173 USA
| |
Collapse
|
13
|
Seeman JI. On the Relationship between Classical Structure Determination and Retrosynthetic Analysis/Total Synthesis†. Isr J Chem 2017. [DOI: 10.1002/ijch.201700079] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry; University of Richmond; Richmond VA 23173 USA
| |
Collapse
|
14
|
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry; University of Richmond; Richmond VA 23173 USA
| |
Collapse
|
15
|
Seeman JI. R. B. Woodward: A Larger-than-Life Chemistry Rock Star. Angew Chem Int Ed Engl 2017; 56:10228-10245. [DOI: 10.1002/anie.201702635] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Indexed: 01/11/2023]
Affiliation(s)
- Jeffrey I. Seeman
- Department of Chemistry; University of Richmond; Richmond VA 23173 USA
| |
Collapse
|
16
|
Pal A, Koduri ND, Wang Z, Quiroz EL, Chong A, Vuong M, Rajagopal N, Nguyen M, Roberts KP, Hussaini SR. Copper-catalyzed chemoselective cross-coupling reaction of thioamides and α-diazocarbonyl compounds: Synthesis of enaminones. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
17
|
Prieto L, Neuburger M, Spingler B, Zelder F. Inorganic Cyanide as Protecting Group in the Stereospecific Reconstitution of Vitamin B12 from an Artificial Green Secocorrinoid. Org Lett 2016; 18:5292-5295. [DOI: 10.1021/acs.orglett.6b02611] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Lucas Prieto
- Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Markus Neuburger
- Department
of Chemistry, University of Basel, Spitalstr. 51, CH 4056 Basel, Switzerland
| | - Bernhard Spingler
- Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - Felix Zelder
- Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| |
Collapse
|
18
|
Pesaro M, Elsinger F, Boos H, Felner-Cabogy I, Gribi H, Wick A, Gschwend H, Eschenmoser A. Corrin Syntheses. Part III. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201200308] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
19
|
|
20
|
Scheffold R, Bertele E, Gschwend H, Häusermann W, Wehrli P, Huber W, Eschenmoser A. Corrin Syntheses. Part II. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201200095] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Blaser HU, Winnacker EL, Fischli A, Hardegger B, Bormann D, Hashimoto N, Schossig J, Keese R, Eschenmoser A. Corrin Syntheses. Part V. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201300064] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
22
|
Yamada Y, Wehrli P, Miljkovic D, Wild HJ, Bühler N, Götschi E, Golding B, Löliger P, Gleason J, Pace B, Ellis L, Hunkeler W, Schneider P, Fuhrer W, Nordmann R, Srinivasachar K, Keese R, Müller K, Neier R, Eschenmoser A. Corrin Syntheses. Part VI. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201500012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|