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Journal articles on the topic 'Intermediates (Chemistry) Photochemistry'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Wan, Peter, Darryl W. Brousmiche, Christy Z. Chen, John Cole, Matthew Lukeman, and Musheng Xu. "Quinone methide intermediates in organic photochemistry." Pure and Applied Chemistry 73, no. 3 (2001): 529–34. http://dx.doi.org/10.1351/pac200173030529.

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Quinone methides are widely encountered reactive intermediates in the chemistry of phenols and related compounds. This paper summarizes our recent progress in uncovering new and general photochemical methods for forming quinone methides of various structural types in aqueous solution. Their mechanism of formation and subsequent chemistry are also discussed. New examples of excited-state intramolecular proton transfer (ESIPT) have been uncovered in these studies. We have also discovered that appropriately designed biphenyls and terphenyls display photochemistry that is best rationalized by high

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2

Bally, Thomas. "Photochemistry of Reactive Intermediates." CHIMIA International Journal for Chemistry 61, no. 10 (2007): 645–49. http://dx.doi.org/10.2533/chimia.2007.645.

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3

Leyva, Elisa, Matthew S. Platz, Silvia E. Loredo-Carrillo, and Johana Aguilar. "Fluoro Aryl Azides: Synthesis, Reactions and Applications." Current Organic Chemistry 24, no. 11 (2020): 1161–80. http://dx.doi.org/10.2174/1385272824999200608132505.

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Background: The complex photochemistry of aryl azides has fascinated scientists for several decades. Spectroscopists have investigated the intermediates formed by different analytical techniques. Theoretical chemists have explained the intrinsic interplay of intermediates under different experimental conditions. Objective & Method: A complete understanding of the photochemistry of a given fluoro aryl azide is a basic requisite for its use in chemistry. In this review, we will discuss the synthesis of several fluoro substituted aryl azides and the reactions and intermediates generated upon

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4

Scaiano, J. C., and L. J. Johnston. "Photochemistry of reaction intermediates." Pure and Applied Chemistry 58, no. 9 (1986): 1273–78. http://dx.doi.org/10.1351/pac198658091273.

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5

Clark, K. Brady, and William J. Leigh. "Cyclobutene photochemistry. Involvement of carbene intermediates in the photochemistry of alkylcyclobutenes." Canadian Journal of Chemistry 66, no. 7 (1988): 1571–78. http://dx.doi.org/10.1139/v88-255.

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The photochemistry of 1,3,3,4- and 1,3,4,4-tetramethylcyclobutene has been investigated in pentane solution with monochromatic far ultraviolet (185, 193, and 214 nm) light sources, as well as in methanol solution with 214-nm excitation. Photolysis of each of the two isomeric cyclobutene derivatives results in competitive electrocyclic ring opening (yielding mixtures of stereoisomeric dienes in each case), fragmentation to yield propyne and methyl-2-butene, and isomerization to the other cyclobutene isomer. Quantum yields for product formation with 185-nm excitation have been measured in each c

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6

Turner, J. J., M. Poliakoff, and M. A. Healy. "Intermediates in organometallic photochemistry-dinuclear complexes." Pure and Applied Chemistry 61, no. 5 (1989): 787–94. http://dx.doi.org/10.1351/pac198961050787.

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7

Zhao, Kai-Hong, та Hugo Scheer. "Intermediates of reversible photochemistry of phycoerythrocyanin α from Mastigocladus laminosus probed by low temperature absorption and circular dichroism spectroscopy". International Journal of Photoenergy 1, № 1 (1999): 25–30. http://dx.doi.org/10.1155/s1110662x99000057.

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The reversible photochemistry of theα-subunit of phycoerythrocyanin (α-PEC) has been measured by low temperature absorption and circular dichroism in the range of 125K to 295 K. Below 185 K, the photochemistry is nearly silent; above 205 K, the photochemistry increases gradually without an indication of intermediates, and between 185 to 205K spectral changes in absorption and circular dichroism indicate an intermediate and/or changes in the interaction(s) between the chromophore and its environment.

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8

Leadbeater, Nicholas E. "Organometallic Photochemistry: The Study of Short-Lived Intermediates." Comments on Inorganic Chemistry 20, no. 2-3 (1998): 57–82. http://dx.doi.org/10.1080/02603599808012252.

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9

Fahie, Brian J., and William J. Leigh. "The far-ultraviolet photochemistry of alkylcyclopropenes in solution." Canadian Journal of Chemistry 67, no. 11 (1989): 1859–67. http://dx.doi.org/10.1139/v89-289.

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The photochemistry of 1,3,3-trimethylcyclopropene and 1-tert-butyl-3,3-dimethylcyclopropene has been investigated in hydrocarbon, methanol, and 1-hexene solution with far-ultraviolet (185–228 nm) light. Direct photolysis of the two compounds affords allene, alkyne, and 1,3-diene derivatives, formally as a result of initial bond cleavage to yield vinylcarbene intermediates. Products derived from cleavage of the most substituted (C1—C3) cyclopropene bond account for 60–80% of the observed mixture in each case. Results from the photolysis of 1,3,3-trimethylcyclopropene-1-13C suggest a second path

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10

Kaletina, Margarita V., Victor F. Plyusnin, Vyacheslav P. Grivin, Valeriy V. Korolev, and Tatyana V. Leshina. "Fast Processes and Intermediates in Photochemistry of 7-Dimethyl-germanorbornadiene." Journal of Physical Chemistry A 110, no. 50 (2006): 13341–48. http://dx.doi.org/10.1021/jp0604950.

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11

Sindler-Kulyk, Marija, Irena Skoric, Nikola Basaric, and Zeljko Marinic. "Observation of the Primary Intermediates in the Photochemistry of o-Vinylstyrylfurans." HETEROCYCLES 55, no. 10 (2001): 1889. http://dx.doi.org/10.3987/com-01-9314.

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12

Bergamini, P., S. Sostero, O. Traverso, and L. M. Venanzi. "Generation of reactive intermediates in the photochemistry of binuclear trihydridodiplatinum complexes." Inorganic Chemistry 29, no. 22 (1990): 4376–80. http://dx.doi.org/10.1021/ic00347a010.

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13

Debad, Jeff D., та Ross H. Hill. "The photochemistry of cylopentadienylmolybdenum complexes including the mechanism of the cis-trans photoisomerism of (η5-C5H5)Mo(CO)2LX, X = Cl Br, I; L = PPh3, PBu3". Canadian Journal of Chemistry 68, № 12 (1990): 2216–20. http://dx.doi.org/10.1139/v90-340.

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Photolysis of trans-(η5-C5H5)Mo(CO)2LX (L = PPh3, PBu3; X = Br, I), at 12 K in 1,2-epoxyethylbenzene, results in CO loss. The product is formed as a specific isomer of (η5-C5H5)Mo(CO)LX, isomer 1. This isomer, upon warming, yields only trans-(η5-C5H5)Mo(CO)2LX in its reaction with CO. Photolysis of cis-(η5-C5H5)Mo(CO)2LX (L = PPh3, PBu3; X = Cl, Br, I) under similar conditions also results in CO loss to generate the unsaturated intermediate, (η5-C5H5)Mo(CO)LX as a different geometric isomer, isomer 2. The unsaturated intermediate, isomer 2, reacts thermally with CO to generate only cis-(η5-C5H

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14

Nag, Lipsa, Andras Lukacs, and Marten H. Vos. "Short‐Lived Radical Intermediates in the Photochemistry of Glucose Oxidase." ChemPhysChem 20, no. 14 (2019): 1793–98. http://dx.doi.org/10.1002/cphc.201900329.

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15

Oelgemöller, Michael, Christian Jung, and Jochen Mattay. "Green photochemistry: Production of fine chemicals with sunlight." Pure and Applied Chemistry 79, no. 11 (2007): 1939–47. http://dx.doi.org/10.1351/pac200779111939.

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Three photochemical reactions were investigated under solar irradiation conditions with moderately concentrated sunlight: the photoacylation of naphthoquinone with butyraldehyde and the dye-sensitized photooxygenations of citronellol and 1,5-dihydroxynaphthalene, respectively. All reactions were easily performed on multigram-to-kilogram scales using cheap and commercially available starting materials, and yielded important key intermediates for industrial applications.

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16

Gano, James E., and Stanley E. Rowan. "Short-lived intermediates. 9. Polar alkene photochemistry and the perpendicular alkene question." Journal of Organic Chemistry 52, no. 20 (1987): 4608–10. http://dx.doi.org/10.1021/jo00229a033.

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17

Nevill, S. M., and J. A. Pincock. "The design of radical clocks to probe the reactivity of the intermediates in arylmethyl ester photochemistry." Canadian Journal of Chemistry 75, no. 2 (1997): 232–47. http://dx.doi.org/10.1139/v97-027.

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The photochemistry in methanol of the esters 1–6was examined. These reactions normally proceed through radical pairs that result from homolytic cleavage of the carbon–oxygen bond in the excited singlet state. Each of the esters was designed to probe the intervention and reactivity of the substituted arylmethyl radical by incorporating a potential radical clock at the carbon of the reactive bond. For esters 1–5, the products isolated indicated that the radical clock was not reactive enough to compete with the very rapid alternate processes of the radical pair, namely, electron transfer to form

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18

Wu, Shihui, Yumei Luo, Fei Liu, and Shiming Chen. "Studies on organosilicon reactive intermediates VIII synthesis and photochemistry of di(?-thienyl) hexamethyltrisilane." Heteroatom Chemistry 7, no. 1 (1996): 45–51. http://dx.doi.org/10.1002/(sici)1098-1071(199601)7:1<45::aid-hc8>3.0.co;2-1.

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19

Foray, Gabriela S., Alicia B. Peñéñory, and Roberto A. Rossi. "Article." Canadian Journal of Chemistry 77, no. 5-6 (1999): 676–80. http://dx.doi.org/10.1139/v99-037.

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The photostimulated reactions of N-cyclopropyl-N-ethyl p-toluensulfonamide (4) with diphenylphosphide ions (2) in liquid ammonia gave 1,3-bis(diphenylphosphinyl)-1-(N-ethyl)propylamine, isolated as the oxide 5, and 1,3-bis(diphenylphosphinyl)-1-propanol, isolated as the oxide 6, all of them corresponding to the aperture of the cyclopropylaminyl radical intermediate. The reaction of 4 with 2 in excess and longer reaction times gave only 5 (73% yield). The photostimulated reactions of N-(n-butyl)-N-cyclobutyl p-toluensulfonamide (13) with 2 in liquid ammonia gave, after oxidation, N-(n-butyl)-N-

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20

Kropp, Paul J., J. Derek Mason, and Gardiner F. H. Smith. "Photochemistry of alkenes. 9. Medium-sized cycloalkenes." Canadian Journal of Chemistry 63, no. 7 (1985): 1845–49. http://dx.doi.org/10.1139/v85-306.

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The behavior of the three medium-sized cycloalkenes cyclooctene (10), cyclodecene (17), and cyclododecene (21) on direct irradiation in pentane and methanol solution has been studied. The results are summarized in Tables 1–3. Irradiation of medium-sized cycloalkenes is a convenient procedure for the preparation of bicyclic products (cf. 13, 14, 19, 20, and 23) through transannular insertion reactions of carbene intermediates (cf. 11, 18, and 22) thought to arise from rearrangement of the 1[π,R(3s)] state via a 1,2-hydrogen shift. The formation of trans-decalin (20) is in contrast to the report

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21

Liang, Tsuei Yun, and Gary B. Schuster. "Photochemistry of 3- and 4-nitrophenyl azide: detection and characterization of reactive intermediates." Journal of the American Chemical Society 109, no. 25 (1987): 7803–10. http://dx.doi.org/10.1021/ja00259a032.

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22

Krusic, Paul J., Roselyne Briere, and Paul Rey. "ESR study of paramagnetic intermediates in the low-temperature photochemistry of olefins and pentacarbonyliron." Organometallics 4, no. 4 (1985): 801–3. http://dx.doi.org/10.1021/om00123a035.

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23

Kim, J. M., and J. A. Pincock. "Internal return in the photochemistry of ring-substituted 1-(1-naphthyl)ethyl esters of phenylacetic acid." Canadian Journal of Chemistry 73, no. 6 (1995): 885–95. http://dx.doi.org/10.1139/v95-111.

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The photochemistry in methanol of the esters 12a–d has been studied in order to determine the importance of internal return of both ion pair and radical pair intermediates. The efficiency of internal return, determined by monitoring 18O exchange between the alcohol and carbonyl oxygens, was shown to be substituent dependent, varying from approximately 10% for the 4,7-dimethoxy substrate to nearly 50% for the 4-cyano case. The corresponding ground state solvolysis reactions gave about 10% internal return and, within experimental error, were substituent independent. Internal return was also exam

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24

Glebov, Evgeni M., Ivan P. Pozdnyakov, Vjacheslav P. Grivin, et al. "Intermediates in photochemistry of Fe(iii) complexes with carboxylic acids in aqueous solutions." Photochem. Photobiol. Sci. 10, no. 3 (2011): 425–30. http://dx.doi.org/10.1039/c0pp00151a.

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25

Sakamoto, Kenkichi, and Hideki Sakurai. "Chemistry of organosilicon compounds. 275. Preparation and photochemistry of disilanylquinones: formation of novel sila-m-quinomethane intermediates." Journal of the American Chemical Society 113, no. 4 (1991): 1466–68. http://dx.doi.org/10.1021/ja00004a088.

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26

Leyva, Elisa, Matthew S. Platz, Gabriele Persy, and Jakob Wirz. "Photochemistry of phenyl azide: the role of singlet and triplet phenylnitrene as transient intermediates." Journal of the American Chemical Society 108, no. 13 (1986): 3783–90. http://dx.doi.org/10.1021/ja00273a037.

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27

Scaiano, J. C., L. J. Johnston, W. G. McGimpsey, and D. Weir. "Photochemistry of organic reaction intermediates: novel reaction paths induced by two-photon laser excitation." Accounts of Chemical Research 21, no. 1 (1988): 22–29. http://dx.doi.org/10.1021/ar00145a004.

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28

Chen, Changyun, Lina Wang, Xiaofang Zhao, et al. "Photochemistry of HNSO2 in cryogenic matrices: spectroscopic identification of the intermediates and mechanism." Physical Chemistry Chemical Physics 22, no. 15 (2020): 7975–83. http://dx.doi.org/10.1039/d0cp00962h.

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Photolysis of the matrix-isolated N-sulfonylamine HNSO<sub>2</sub> yields fragments HONO, HO˙, ˙NO, ˙NO<sub>2</sub>, and S<sub>2</sub> and also novel isomers HONSO, HOSNO, HOS(O)N, HS(O)NO, HN(O)SO, HSONO, and a caged radical pair HOS˙⋯˙NO.

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29

Price, John D., and Richard P. Johnson. "Cumulene photochemistry: evidence for cis and trans cyclopropylidene intermediates in triplet photoreactions of 1,2-cyclodecadiene." Journal of the American Chemical Society 107, no. 7 (1985): 2187–89. http://dx.doi.org/10.1021/ja00293a069.

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30

Boate, D. R., L. J. Johnston, P. C. Kwong, E. Lee-Ruff, and J. C. Scaiano. "First measurements of absolute rate constants for oxacarbene intermediates produced in the photochemistry of benzocyclobutenedione." Journal of the American Chemical Society 112, no. 24 (1990): 8858–63. http://dx.doi.org/10.1021/ja00180a030.

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31

Huck, Lawrence A., Musheng Xu, Kaya Forest, and Peter Wan. "Efficient photodecarboxylation of 3- and 4-acetylphenylacetic acids in aqueous solution." Canadian Journal of Chemistry 82, no. 12 (2004): 1760–68. http://dx.doi.org/10.1139/v04-122.

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The photochemistry of 3- and 4-acetylphenylacetic acids (6 and 7) has been studied in aqueous solution. This work is a continuation of research efforts aimed at understanding the structural effects on the efficacy for benzyl carbanion photogeneration via photodecarboxylation. The nitro group (at the 3- and 4-positions) is known to be an exceptionally good activating group on the benzene ring because of its enhanced electron-withdrawing effect in the excited triplet state for photodecarboxylation and the related photo-retro-aldol type process. It is shown in this work that the acetyl group

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32

Pirisi, Katalin, Lipsa Nag, Zsuzsanna Fekete, et al. "Identification of the vibrational marker of tyrosine cation radical using ultrafast transient infrared spectroscopy of flavoprotein systems." Photochemical & Photobiological Sciences 20, no. 3 (2021): 369–78. http://dx.doi.org/10.1007/s43630-021-00024-y.

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AbstractTryptophan and tyrosine radical intermediates play crucial roles in many biological charge transfer processes. Particularly in flavoprotein photochemistry, short-lived reaction intermediates can be studied by the complementary techniques of ultrafast visible and infrared spectroscopy. The spectral properties of tryptophan radical are well established, and the formation of neutral tyrosine radicals has been observed in many biological processes. However, only recently, the formation of a cation tyrosine radical was observed by transient visible spectroscopy in a few systems. Here, we as

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33

Flegel, Mitchel, Matthew Lukeman, and Peter Wan. "Photochemistry of 1,1′-bi-2-naphthol (BINOL) — ESIPT is responsible for photoracemization and photocyclization." Canadian Journal of Chemistry 86, no. 2 (2008): 161–69. http://dx.doi.org/10.1139/v07-143.

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The photochemistry of 1,1′-bi-2-naphthol (BINOL, 5) has been studied in aqueous solution and found to undergo rapid deuterium incorporation at the 4 and 5 positions (in D2O-CH3CN). All data is consistent with exchange arising via a formal excited state intramolecular proton transfer (ESIPT) from the naphtholic OH to the 4 and 5 positions of the other ring to give quinine methides (QMs) 8 and 9, respectively, both of which subsequently revert to starting material. Photolysis of enantiomerically pure (+)-5 in D2O-CH3CN resulted in racemization concurrent with deuterium incorporation. This is str

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34

Turro, Nicholas J. "Fun with Photons, Reactive Intermediates, and Friends. Skating on the Edge of the Paradigms of Physical Organic Chemistry, Organic Supramolecular Photochemistry, and Spin Chemistry." Journal of Organic Chemistry 76, no. 24 (2011): 9863–90. http://dx.doi.org/10.1021/jo201786a.

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35

Hasharoni, Kobi, Haim Levanon, Jau Tang, et al. "Singlet photochemistry in model photosynthesis: identification of charge separated intermediates by Fourier transform and CW-EPR spectroscopies." Journal of the American Chemical Society 112, no. 18 (1990): 6477–81. http://dx.doi.org/10.1021/ja00174a004.

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36

Krupenya, D. V., E. O. Danilov, M. A. J. Rodgers, and S. P. Tunik. "Reaction Intermediates in the Solution Photochemistry of a Tetrarhodium Carbonyl Cluster: FTIR Structural Characterization and Transient Kinetics." Journal of Physical Chemistry A 107, no. 42 (2003): 8867–71. http://dx.doi.org/10.1021/jp035050f.

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37

Pincock, A. L., and J. A. Pincock. "The structure, photochemical reactivity, and photophysical properties of adamantyl X-substituted aryl ethers and a comparison with the alkyl groups, methyl, tert-butyl, and allyl." Canadian Journal of Chemistry 83, no. 9 (2005): 1237–52. http://dx.doi.org/10.1139/v05-117.

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The structure, photophysical properties, and photochemistry of the adamantyl aryl ethers 1 in both methanol and cyclohexane have been examined. UV absorption spectra, 13C NMR chemical shifts, X-ray structures, and Gaussian calculations (B3LYP/6-31G(d)) indicate that these ethers adopt a 90° conformer in the ground state. In contrast, fluorescence spectra, excited singlet state lifetimes, and calculations (TDDFT) indicated a 0° conformer is preferred in the first excited singlet state S1. Irradiation in either solvent results in the formation of adamantane and the corresponding phenol as the ma

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38

Nunes, Cláudio M., Sandra M. V. Pinto, Igor Reva, Mário T. S. Rosado, and Rui Fausto. "Photochemistry of matrix-isolated 3-chloro-1,2-benzisoxazole: Generation and characterization of 2-cyanophenoxyl radical and other reactive intermediates." Journal of Molecular Structure 1172 (November 2018): 33–41. http://dx.doi.org/10.1016/j.molstruc.2017.11.009.

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39

Wang, Ya, Yang Liu, and Isaac B. Bersuker. "Sudden polarization and zwitterion formation as a pseudo-Jahn–Teller effect: a new insight into the photochemistry of alkenes." Physical Chemistry Chemical Physics 21, no. 20 (2019): 10677–92. http://dx.doi.org/10.1039/c9cp01023h.

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We show that the intermediates of photochemical reactions—sudden polarization and zwitterion formations—are consequences of the pseudo-Jahn–Teller effect (PJTE), which facilitates a better understanding, rationalization, prediction, and manipulation of the corresponding chemical and biological processes.

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40

SAKAMOTO, K., and H. SAKURAI. "ChemInform Abstract: Chemistry of Organosilicon Compounds. Part 275. Preparation and Photochemistry of Disilanyl Quinones: Formation of Novel Sila-m- quinomethane Intermediates." ChemInform 22, no. 26 (2010): no. http://dx.doi.org/10.1002/chin.199126218.

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41

Beckers, Helmut, Xiaoqing Zeng, and Helge Willner. "Intermediates Involved in the Oxidation of Nitrogen Monoxide: Photochemistry of thecis-N2O2⋅O2complex and ofsym-N2O4in Solid Ne Matrices." Chemistry - A European Journal 16, no. 5 (2010): 1506–20. http://dx.doi.org/10.1002/chem.200902406.

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42

Turro, Nicholas J. "ChemInform Abstract: Fun with Photons, Reactive Intermediates, and Friends. Skating on the Edge of the Paradigms of Physical Organic Chemistry, Organic Supramolecular Photochemistry, and Spin Chemistry." ChemInform 43, no. 5 (2012): no. http://dx.doi.org/10.1002/chin.201205267.

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43

Hopanna, Mamatha, Lisa Kelly, and Lee Blaney. "Photochemistry of the Organoselenium Compound Ebselen: Direct Photolysis and Reaction with Active Intermediates of Conventional Reactive Species Sensitizers and Quenchers." Environmental Science & Technology 54, no. 18 (2020): 11271–81. http://dx.doi.org/10.1021/acs.est.0c03093.

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44

Ishiyama, Jun-ichi, and Yuan L. Chow. "A novel photorearrangement of 1,3-diketonatoborinate: a photoinduced intramolecular alkylation on a conjugated carbonyl system." Canadian Journal of Chemistry 77, no. 8 (1999): 1374–83. http://dx.doi.org/10.1139/v99-139.

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Irradiation of borinates derived from 9-borabicyclo[3,3,1]nonane and 1,3-diketones at their π-π* transition band caused a rearrangement from their triplet excited state to give boronate intermediates that could be hydrolyzed to the corresponding aldols. The primary photolysis involves the scission of one of the BC bonds followed by a 1,3- or 1,5-migration and the formation of a more stable BO bond by radical pathways. The triplet state reaction was established by quenching and heavy atom effect experiments. The overall reaction pattern is an irreversible 1,2- or 1,4-addition of an alkyl-boro

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45

Yoon, Ung Chan, Hyuk Chul Kwon, Tae Gyung Hyung, et al. "The Photochemistry of Polydonor-Substituted Phthalimides: Curtin-Hammett-Type Control of Competing Reactions of Potentially Interconverting Zwitterionic Biradical Intermediates." Journal of the American Chemical Society 126, no. 4 (2004): 1110–24. http://dx.doi.org/10.1021/ja0305712.

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46

Li, Lei. "Using Organic Synthesis and Chemical Analysis to Understand the Photochemistry of Spore Photoproduct and Other Pyrimidine Dimers." Synlett 29, no. 01 (2017): 15–33. http://dx.doi.org/10.1055/s-0036-1590981.

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Pyrimidine dimerization is the dominant DNA photoreaction occurring in vitro and in vivo. Three types of dimers, cyclobutane pyrimidine dimers (CPDs), pyrimidine (6-4) pyrimidone photoproducts (6-4PPs), and the spore photoproduct (SP), are formed from the direct dimerization process; it is of significance to understand the photochemistry and photobiology of these dimers. Traditionally, pyrimidine dimerization was studied by using the natural pyrimidine residues thymine and cytosine, which share similar chemical structures and similar reactivity, making it sometimes less straightforward for one

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47

Bitterwolf, Thomas E. "Photochemistry and reaction intermediates of the bimetallic Group VIII cyclopentadienyl metal carbonyl compounds, (η5-C5H5)2M2(CO)4 and their derivatives". Coordination Chemistry Reviews 206-207 (вересень 2000): 419–50. http://dx.doi.org/10.1016/s0010-8545(00)00251-4.

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48

Luo, Jia, Heiko Ihmels, Hans-Jörg Deiseroth та Marc Schlosser. "Controlling the regioselectivity of the di-π-methane rearrangements of 1,2-naphtho-annelated barrelene derivatives — Solution versus solid-state photochemistry". Canadian Journal of Chemistry 87, № 5 (2009): 619–26. http://dx.doi.org/10.1139/v09-035.

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The synthesis of 1,2-naphtho-annelated barrelene derivatives, namely dimethyl-7,12-dihydro-7,12-ethenobenzo[a]anthracene-13,14-dicarboxylate (4a) and dimethyl-7,14-dihydro-7,14-ethenodibenzo[a,j]-anthracene-15,16-dicarboxylate (4b), and the investigation of their photoreactivity in solution and in the solid state is reported. The irradiation of 4a and 4b resulted in regioselective di-π-methane rearrangements to give semibullvalene products; however, the product distribution is inverted upon changing the reaction medium from solution to the solid state. In solution, an α-naphtho–vinyl bridging

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49

Carena, Luca, and Davide Vione. "Mapping the Photochemistry of European Mid-Latitudes Rivers: An Assessment of Their Ability to Photodegrade Contaminants." Molecules 25, no. 2 (2020): 424. http://dx.doi.org/10.3390/molecules25020424.

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Abstract:

The abiotic photochemical reactions that take place naturally in sunlit surface waters can degrade many contaminants that pose concern to water bodies for their potentially toxic and long-term effects. This works aims at assessing the ability of European rivers to photoproduce reactive transient intermediates, such as HO• radicals and the excited triplet states of chromophoric dissolved organic matter (3CDOM*), involved in pollutant degradation. A photochemical mapping of the steady-state concentrations of these transients was carried out by means of a suitable modeling tool, in the latitude b

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Da Silva, José P., Edgar V. Bastos, Luis F. V. Ferreira, and Richard G. Weiss. "Surface photochemistry of the herbicide napropamide. The role of the media and environmental factors in directing the fates of intermediates." Photochem. Photobiol. Sci. 7, no. 1 (2008): 69–75. http://dx.doi.org/10.1039/b713369c.

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