1
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Mao R, Li W, Jia P, Ding H, Teka T, Zhang L, Fu Z, Fu X, Kaushal S, Dou Z, Han L. An efficient and sensitive method on the identification of unsaturated fatty acids in biosamples: Total lipid extract from bovine liver as a case study. J Chromatogr A 2022; 1675:463176. [DOI: 10.1016/j.chroma.2022.463176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 05/15/2022] [Accepted: 05/24/2022] [Indexed: 12/14/2022]
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2
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Guerra C, Ayarde-Henríquez L, Duque-Noreña M, Chamorro E. Unraveling the Bonding Nature Along the Photochemically Activated Paterno-Büchi Reaction Mechanism. Chemphyschem 2021; 22:2342-2351. [PMID: 34549490 DOI: 10.1002/cphc.202100594] [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: 08/10/2021] [Revised: 09/10/2021] [Indexed: 01/26/2023]
Abstract
The photochemically activated Paterno-Büchi reaction mechanism following the singlet excited-state reaction path was analyzed based on a bonding evolution framework. The electronic rearrangements, which describe the mechanism of oxetane formation via carbon-oxygen attack (C-O), comprises of the electronic activation of formaldehyde and accumulation of pairing density on the O once the reaction system is approaching the conical intersection point. Our theoretical evidence based on the ELF topology shows that the C-O bond is formed in the ground-state surface (via C-O attack) returning from the S1 surface accompanied by 1,4-singlet diradical formation. Subsequently, the reaction center is fully activated near the transition state (TS), and the ring-closure (yielding oxetane) involves the C-C bond formation after the TS. For the carbon-carbon attack (C-C), both reactants (formaldehyde and ethylene) are activated, leading to C-C bond formation in the S1 excited state before reaching the conical intersection region. Finally, the C-O formation occurs in the ground-state surface, resulting from the pair density flowing primarily from the C to O atom.
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Affiliation(s)
- Cristian Guerra
- Universidad Andrés Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas, Avenida, República 275, 8370146, Santiago de Chile, Chile
| | - Leandro Ayarde-Henríquez
- Universidad Andrés Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas, Avenida, República 275, 8370146, Santiago de Chile, Chile
| | - Mario Duque-Noreña
- Universidad Andrés Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas, Avenida, República 275, 8370146, Santiago de Chile, Chile
| | - Eduardo Chamorro
- Universidad Andrés Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas, Avenida, República 275, 8370146, Santiago de Chile, Chile
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3
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Giussani A, Worth GA. On the Intrinsically Low Quantum Yields of Pyrimidine DNA Photodamages: Evaluating the Reactivity of the Corresponding Minimum Energy Crossing Points. J Phys Chem Lett 2020; 11:4984-4989. [PMID: 32490676 DOI: 10.1021/acs.jpclett.0c01264] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The low quantum yield of photoformation of cyclobutane pyrimidine dimers and pyrimidine-pyrimidone (6-4) adducts in DNA bases is usually associated with the presence of more favorable nonreactive decay paths and with the unlikeliness of exciting the system in a favorable conformation. Here, we prove that the ability of the reactive conical intersection to bring the system either back to the absorbing conformation or to the photoproduct must be considered as a fundamental factor in the low quantum yields of the mentioned photodamage. In support of the proposed model, the one order of magnitude difference in the quantum yield of formation of the cyclobutane thymine dimer with respect to the thymine-thymine (6-4) adduct is rationalized here by comparing the reactive ability of the seam of intersections leading respectively to the cyclobutane thymine dimer and the oxetane precursor of the thymine-thymine (6-4) adduct at the CASPT2 level of theory.
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Affiliation(s)
- Angelo Giussani
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Graham A Worth
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
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4
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Abstract
This review represents the most complete description of the scientific results obtained on a photochemical reaction described 110 years ago by an Italian scientist.
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Affiliation(s)
- Maurizio D'Auria
- Dipartimento di Scienze
- Università della Basilicata
- 85100 Potenza
- Italy
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5
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Giussani A, Conti I, Nenov A, Garavelli M. Photoinduced formation mechanism of the thymine–thymine (6–4) adduct in DNA; a QM(CASPT2//CASSCF):MM(AMBER) study. Faraday Discuss 2018; 207:375-387. [DOI: 10.1039/c7fd00202e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Out-of-plane puckering of the C4′ atom forming a new CC bond seems essential for oxetane formation.
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Affiliation(s)
- Angelo Giussani
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- 40126 Bologna
- Italy
| | - Irene Conti
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- 40126 Bologna
- Italy
- Dipartimento di Chimica Industriale “Toso Montanari”
| | - Artur Nenov
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- 40126 Bologna
- Italy
- Dipartimento di Chimica Industriale “Toso Montanari”
| | - Marco Garavelli
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- 40126 Bologna
- Italy
- Dipartimento di Chimica Industriale “Toso Montanari”
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6
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Kärkäs M, Porco JA, Stephenson CRJ. Photochemical Approaches to Complex Chemotypes: Applications in Natural Product Synthesis. Chem Rev 2016; 116:9683-747. [PMID: 27120289 PMCID: PMC5025835 DOI: 10.1021/acs.chemrev.5b00760] [Citation(s) in RCA: 674] [Impact Index Per Article: 84.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Indexed: 01/29/2023]
Abstract
The use of photochemical transformations is a powerful strategy that allows for the formation of a high degree of molecular complexity from relatively simple building blocks in a single step. A central feature of all light-promoted transformations is the involvement of electronically excited states, generated upon absorption of photons. This produces transient reactive intermediates and significantly alters the reactivity of a chemical compound. The input of energy provided by light thus offers a means to produce strained and unique target compounds that cannot be assembled using thermal protocols. This review aims at highlighting photochemical transformations as a tool for rapidly accessing structurally and stereochemically diverse scaffolds. Synthetic designs based on photochemical transformations have the potential to afford complex polycyclic carbon skeletons with impressive efficiency, which are of high value in total synthesis.
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Affiliation(s)
- Markus
D. Kärkäs
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - John A. Porco
- Department
of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Corey R. J. Stephenson
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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7
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Harris SJ, Murdock D, Grubb MP, Clark IP, Greetham GM, Towrie M, Ashfold MNR. Tracking a Paternò–Büchi Reaction in Real Time Using Transient Electronic and Vibrational Spectroscopies. J Phys Chem A 2014; 118:10240-5. [DOI: 10.1021/jp507958y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephanie J. Harris
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, United Kingdom
| | - Daniel Murdock
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, United Kingdom
| | - Michael P. Grubb
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, United Kingdom
| | - Ian P. Clark
- Central
Laser Facility, Research Complex at Harwell, Science and Technology
Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, United Kingdom
| | - Gregory M. Greetham
- Central
Laser Facility, Research Complex at Harwell, Science and Technology
Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, United Kingdom
| | - Michael Towrie
- Central
Laser Facility, Research Complex at Harwell, Science and Technology
Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, United Kingdom
| | - Michael N. R. Ashfold
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, United Kingdom
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8
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Dix I, Bondarenko L, Jones PG, Ernst L, Ibrom K, Grunenberg J, Boese R, Hopf H. Preparation, Structural Properties and Thermal Isomerization of Hex-3-ene-1,5-diyne Bridged [2.2]Paracyclophanes. Chemistry 2014; 20:16360-76. [DOI: 10.1002/chem.201403122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 08/27/2014] [Indexed: 11/06/2022]
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9
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Maeda S, Taketsugu T, Morokuma K. Exploring Pathways of Photoaddition Reactions by Artificial Force Induced Reaction Method: A Case Study on the Paternò–Büchi Reaction. Z PHYS CHEM 2013. [DOI: 10.1524/zpch.2013.0401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Schalk O, Broman SL, Petersen MÅ, Khakhulin DV, Brogaard RY, Nielsen MB, Boguslavskiy AE, Stolow A, Sølling TI. On the Condensed Phase Ring-Closure of Vinylheptafulvalene and Ring-Opening of Gaseous Dihydroazulene. J Phys Chem A 2013; 117:3340-7. [DOI: 10.1021/jp400616c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Oliver Schalk
- Stockholm University, AlbaNova University
Center, Roslagstullsbacken 21, SE-10961 Stockholm,
Sweden
- National Research Council, Sussex Drive 100, K1A 0R6, Ottawa, Canada
- Lehrstuhl für BioMolekulare
Optik, Ludwig-Maximilians-Universität, Oettingenstrasse 67, 80538 München, Germany
| | - Søren L. Broman
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100
Copenhagen, Denmark
| | - Michael Å. Petersen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100
Copenhagen, Denmark
| | - Dmitry V. Khakhulin
- European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP220, 38043
Grenoble, France
| | - Rasmus Y. Brogaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100
Copenhagen, Denmark
- Department of
Chemical Engineering, Stanford University, Stanford, California 94305, United
States
| | - Mogens Brøndsted Nielsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100
Copenhagen, Denmark
| | | | - Albert Stolow
- National Research Council, Sussex Drive 100, K1A 0R6, Ottawa, Canada
| | - Theis I. Sølling
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100
Copenhagen, Denmark
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11
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Sekikawa T, Schalk O, Wu G, Boguslavskiy AE, Stolow A. Initial Processes of Proton Transfer in Salicylideneaniline Studied by Time-Resolved Photoelectron Spectroscopy. J Phys Chem A 2013; 117:2971-9. [DOI: 10.1021/jp4016036] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Taro Sekikawa
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A
0R6, Canada
- Department
of Applied Physics, Hokkaido University, Kita-13 Nishi-8, Kita-ku, Sapporo
060-8628, Japan
| | - Oliver Schalk
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A
0R6, Canada
- Stockholm University, Alba Nova University Center,
Roslagstullsbacken 21, SE-10691 Stockholm,
Sweden
- Lehrstuhl für
BioMolekulare
Optik, Ludwig-Maximilians-Universität, Oettingenstraße 67, 80538 München, Germany
| | - Guorong Wu
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A
0R6, Canada
- State Key Laboratory of Molecular
Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023,
P. R. China
| | | | - Albert Stolow
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A
0R6, Canada
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12
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Giussani A, Serrano-Andrés L, Merchán M, Roca-Sanjuán D, Garavelli M. Photoinduced formation mechanism of the thymine-thymine (6-4) adduct. J Phys Chem B 2013; 117:1999-2004. [PMID: 23339629 DOI: 10.1021/jp307200g] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photoinduced mechanism leading to the formation of the thymine-thymine (6-4) photolesion has been studied by using the CASPT2//CASSCF approach over a dinucleotide model in vacuo. Following light absorption, localization of the excitation on a single thymine leads to fast singlet-triplet crossing that populates the triplet (3)(nπ*) state of thymine. This state, displaying an elongated C(4)═O bond, triggers (6-4) dimer formation by reaction with the C(5)═C(6) double bond of the adjacent thymine, followed by a second intersystem crossing, which acts as a gate between the excited state of the reactant and the ground state of the photoproduct. The requirement of localized excitation on just one thymine, whose main decay channel (by radiationless repopulation of its ground state) is nonphotochemical, can rationalize the experimentally observed low quantum yield of formation for the thymine-thymine (6-4) adduct.
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Affiliation(s)
- Angelo Giussani
- Instituto de Ciencia Molecular, Universitat de València, Apartado 22085, ES-46071 Valencia, Spain.
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