Journal of Physical Organic Chemistry最新文献

In-Depth Insights Into the Excited State Intramolecular Proton Transfer of Biologically Active Triazene Derivatives of Oxazole 生物活性恶唑三氮烯衍生物分子内激发态质子转移的深入研究

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-05-13 DOI: 10.1002/poc.70018

Ritu Payal, Manju K. Saroj, Sapan Kumar Jain, R. C. Rastogi

{"title":"In-Depth Insights Into the Excited State Intramolecular Proton Transfer of Biologically Active Triazene Derivatives of Oxazole","authors":"Ritu Payal, Manju K. Saroj, Sapan Kumar Jain, R. C. Rastogi","doi":"10.1002/poc.70018","DOIUrl":"https://doi.org/10.1002/poc.70018","url":null,"abstract":"<div>\u0000 \u0000 Phenyltriaz-1-en-1-yl-4-phenyloxazoles (PTOs) have been identified as photoinduced tautomeric photophysical probes. A series of PTOs has been synthesized and studied for their absorption and fluorescence spectral behavior in different solvent media with varying polarities. PTOs exhibited dual fluorescence behavior and large Stoke's shifts suggesting the presence of tautomeric forms (N* and T*). Dipole moments of PTOs in their excited states were calculated using Bakhshiev, Lippert–Mataga, Reichardt, and Kawski solvatochromic shift methods and were correlated with the theoretical dipole moments for N* and T* forms. The frontier molecular orbitals (HOMO-LUMO) and various physicochemical parameters (χ, η, σ, μp, ω, ΔEII, Nmax) were calculated using density functional theory (ground state-(CIS)/B3LYP/6–311++G(d,p)) computations to analyze the excited state intramolecular proton transfer (ESIPT) within these probes. The electrostatic potential (ESP) maps and Mulliken/NBO charges established the electrophilic and nucleophilic sites within molecules and intramolecular proton transfer from one end of the triazeno-bridge to the other end. DFT incorporated dispersion correction (D3(BJ)) accounts for significant van der Waals interactions. In vitro antioxidant activity of PTOs studied using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay revealed them as potential antioxidants. Two multi-parametric scales based on solvent polarity, namely, (i) Catálan and (ii) Abboud-Kamlet-Taft, were employed to analyze the acidity and basicity of PTOs in ground and excited states to provide a plausible mechanism for ESIPT.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 6","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Computational Insight to Stereochemical Control on Conjugate Addition of Pyrroloalkenyl Thiol on Activated Alkyne 吡咯烯基硫醇在活化炔上共轭加成立体化学控制的计算研究

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-05-06 DOI: 10.1002/poc.70019

Akankasha Yadav, Sunita Siyak, Neelima Gupta

{"title":"Computational Insight to Stereochemical Control on Conjugate Addition of Pyrroloalkenyl Thiol on Activated Alkyne","authors":"Akankasha Yadav, Sunita Siyak, Neelima Gupta","doi":"10.1002/poc.70019","DOIUrl":"https://doi.org/10.1002/poc.70019","url":null,"abstract":"<div>\u0000 \u0000 [3+2] Cycloaddition reaction of thiazolium ylide with activated acetylene does not yield the expected pyrrolothiazole, in contrast to a similar reaction of other N-cycloiminium ylides. Initially formed [3+2] cycloadduct undergoes thiazole ring opening followed by a thiol-yne type nucleophilic addition on second molecule of activated alkyne to give E,Z and/or Z,Z isomers of 1:2 adduct. We have investigated the reaction of thiazolium ylides with alkyl propiolate computationally at DFT level to understand the impact of stereochemical control on mechanistic aspects. Relatively more stable conformer of thiazolium ylide leads to a thermodynamically as well as kinetically preferred diastereomer of the cycloadduct having trans orientation of hydrogen atoms, which restricts the auto-oxidation and facilitates the ring opening. Formation of the Z or E isomer in subsequent thiol-yne reaction depends on the stereochemical control of the allene or allenoate intermediate. Experimentally observed reactivity of thiazolium ylide is computationally rationalized on the basis of the CDFT-based reactivity indices and the stereochemical control on reaction mechanism.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 6","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Computational and Experimental Exploration of Di-Iodo-Based Schiff Bases as Esterase Inhibitors: Single Crystal and Spectral Insights 计算和实验探索二碘基希夫碱酯酶抑制剂：单晶和光谱的见解

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-04-25 DOI: 10.1002/poc.70017

Onur Erman Doğan, Muhammad Asam Raza, Mohd Farhan, Adnan Ashraf, Zeshan Ali Sandhu, Muhammad Hamayun, Erbil Ağar, Jahan Zaib Arshad, Necmi Dege, Shafiq Ur Rehman

{"title":"Computational and Experimental Exploration of Di-Iodo-Based Schiff Bases as Esterase Inhibitors: Single Crystal and Spectral Insights","authors":"Onur Erman Doğan, Muhammad Asam Raza, Mohd Farhan, Adnan Ashraf, Zeshan Ali Sandhu, Muhammad Hamayun, Erbil Ağar, Jahan Zaib Arshad, Necmi Dege, Shafiq Ur Rehman","doi":"10.1002/poc.70017","DOIUrl":"https://doi.org/10.1002/poc.70017","url":null,"abstract":"<div>\u0000 \u0000 The current study was aimed at synthesizing (E)-2-(((3-hydroxy-4-methylphenyl)imino)methyl)-4,6-diiodophenol (1) and (E)-3-((2-hydroxy-3,5-diiodobenzylidene)amino)-4-methylbenzoate (2). The modern spectral tools like UV–Vis, FTIR, and NMR were used to determine the structures, while a single X-ray diffraction approach was employed to prove that Compound 2 is orthorhombic and Compound 1 is triclinic. The 6-31G(d,p) basis set along B3LYP (hybrid functional) was used for the optimisation of synthesized compounds. The energy gaps between various orbitals were estimated using DFT calculations, and a comparative study in terms of different structural parameters was also conducted, which confirmed the correlation between XRD and DFT measurements. Two-dimensional fingerprint plots and Hirshfeld surface analysis were used to further elucidate the different interactions that stabilize the crystal. In vitro and in silico studies were employed to assess the biological potential of these molecules in terms of enzyme inhibition. Compound 2 depicted 74.17 ± 1.4% and 69.11 ± 1.3% inhibition against AChE and BChE, respectively. The docking score, as well as in vitro studies, demonstrated that Compound 2 is more potent than Compound 1 against acetylcholine esterase and butyrylcholine esterase.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 6","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oxidation Reaction of Dihydroazolopyridines: Quantum Chemical Study 二氢偶氮吡啶的氧化反应：量子化学研究

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-04-25 DOI: 10.1002/poc.70016

Mariia O. Shyshkina, Serhiy M. Desenko

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Tetra(4-hexylphenyl) [3]- and [5]Cumulenes 四(4-己基苯基)[3]-和[5]积雪草烯

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-04-14 DOI: 10.1002/poc.70015

Bozheng Sun, Stefano Pecorario, Elda Sala, Mario Caironi, Michael J. Ferguson, Carlo S. Casari, Rik R. Tykwinski

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Mechanistic and Curtin–Hammett Studies of the 1O2 Oxidation of a Prenyl Phenol and Phenolate Anion 异戊基苯酚和酚酸阴离子的氧化机理及Curtin-Hammett研究

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-03-25 DOI: 10.1002/poc.70014

Akshaya Iyer, Lloyd Lapoot, Alexander Greer

{"title":"Mechanistic and Curtin–Hammett Studies of the 1O2 Oxidation of a Prenyl Phenol and Phenolate Anion","authors":"Akshaya Iyer, Lloyd Lapoot, Alexander Greer","doi":"10.1002/poc.70014","DOIUrl":"https://doi.org/10.1002/poc.70014","url":null,"abstract":"<div>\u0000 \u0000 The Curtin–Hammett principle, widely recognized in thermal reactions, has been extended to photosensitization processes in this study, providing new insights into the reactivity of photogenerated singlet oxygen (1O2) with phenol and phenolate anion species. Here, we explore mechanistic and Curtin–Hammett studies of the equilibrium between the phenol and phenolate anion forms of a prenylated natural product, prenylphloroglucinol. This study uses density functional theory (DFT) to examine phenol and phenolate anion-quenching pathways of 1O2 showing distinct pathways for each form. In the phenolate anion, 1O2 is quenched to form a peroxy anion. In contrast, in the phenol form, 1O2 leads to a potent epoxidizing agent in a seemingly pro-oxidant path. An iso-hydroperoxyhydrofuran intermediate is proposed to be key in the epoxidation. Meanwhile, the phenolate anion cyclizes and protonates forming a comparatively benign hydroperoxyhydrofuran species. The phloroglucinol is next to the C-prenyated group directs the reaction pathway towards the formation of a dihydrobenzofuran, deviating from the conventional 1O2 “ene” reaction mechanism and the production of allylic hydroperoxides typically observed in trisubstituted alkenes.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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The Influence of Homoring Competition Effect of Substituents on the Nonclassical Hydrogen Bonding Properties in Diarylnitroketone 取代基的同源竞争效应对二芳基硝基酮非经典氢键性质的影响

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-03-24 DOI: 10.1002/poc.70013

Hua Luo, Chao-Tun Cao, Chenzhong Cao

{"title":"The Influence of Homoring Competition Effect of Substituents on the Nonclassical Hydrogen Bonding Properties in Diarylnitroketone","authors":"Hua Luo, Chao-Tun Cao, Chenzhong Cao","doi":"10.1002/poc.70013","DOIUrl":"https://doi.org/10.1002/poc.70013","url":null,"abstract":"<div>\u0000 \u0000 Nonclassical hydrogen bond (NCHB) as a weak interaction force not only plays an important role in organic conversion and catalysis but also has significant implications for understanding and predicting the properties of compounds. At present, the influence of homoring competition effect of substituents on the intramolecular properties of NCHB has not been studied. In this work, 51 diphenylnitroketone XArCH=N(O)ArY (XPNY) compounds containing different substituents were chosen as model molecules, the bond energy (EHB) in CH⋯O and aromaticity of quasi-aromatic ring (PDIQ) were computed, and the chemical shifts δH(CH⋯O) of 1H NMR in CH⋯O were collected or measured. This work focuses on analyzing the NCHB CH⋯O hydrogen bond in compounds XPNY and explored the influence of homoring competition effect of substituents on the energy EHB of CH⋯O and chemical shift value δH(CH⋯O). The results show that (1) the chemical shift values δH(CH⋯O) of CH⋯O in XPNY are abnormally large, and the values of EHB are 14.15–15.51 kJ/mol, lower than 16.74 kJ/mol, which is consistent with the characteristics of intramolecular NCHB. Therefore, it can be considered that the CH⋯O hydrogen bonds are NCHB in XPNY. (2) The substituent X in compound XPNY exhibits the homoring competition effect. (3) The aromaticity of quasi-aromatic ring Q is the main factor affecting the EHB. The substituent X affects the EHB and δH(CH⋯O) along different paths. This study can help understanding the impact of substituent effects on NCHB in depth.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143689968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Calculation of the Energy of Intramolecular Hydrogen Bonds Using the Clipping Method: The Case of ω-X-1-Alkanols, X(CH2)nOH 用剪切法计算分子内氢键能量：ω-X-1-烷醇，X(CH2)nOH的例子

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-03-24 DOI: 10.1002/poc.70011

Robert E. Rosenberg

{"title":"Calculation of the Energy of Intramolecular Hydrogen Bonds Using the Clipping Method: The Case of ω-X-1-Alkanols, X(CH2)nOH","authors":"Robert E. Rosenberg","doi":"10.1002/poc.70011","DOIUrl":"https://doi.org/10.1002/poc.70011","url":null,"abstract":"<div>\u0000 \u0000 Although the energies of intermolecular hydrogen bonds, EHB, can be ascertained by a variety of approaches, there is not a general method to accurately determine the energies for intramolecular hydrogen bonds, EIMHB. Structures for compounds X(CH2)nOH {X = F, OH, NH2, Cl, Br, SH; n = 4–5} are calculated and then “clipped” to form complexes CH3CH2X•CH3CH2OH such that the critical geometric, spectroscopic, and electron density features are preserved. The EIMHB of the parent molecule is assumed to equal the EHB of the complex. Of the previous methods of determining EIMHB, the molecular tailoring approach (MTA) comes closest to the values from this work with the differences due to incomplete cancellation of conformational effects in the MTA. In general, parametric methods fare poorly, only being effective for groups of similar molecules. The cis–trans and isodesmic approaches are of limited value for longer carbon chains due to conformational strain.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143690122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Polybenzenoid Hydrocarbons in the S1 State: Simple Structural Motifs Predict Electronic Properties and (Anti)aromaticity S1态的多苯烃：简单结构基序预测电子性质和（反）芳构性

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-03-24 DOI: 10.1002/poc.70012

Fatimah Khaleel, Sabyasachi Chakraborty, Renana Gershoni-Poranne

{"title":"Polybenzenoid Hydrocarbons in the S1 State: Simple Structural Motifs Predict Electronic Properties and (Anti)aromaticity","authors":"Fatimah Khaleel, Sabyasachi Chakraborty, Renana Gershoni-Poranne","doi":"10.1002/poc.70012","DOIUrl":"https://doi.org/10.1002/poc.70012","url":null,"abstract":"Polybenzenoid hydrocarbons (PBHs) are widely studied for their semiconductive properties and potential applications in organic electronics and photochemistry. Understanding their behavior in excited states is crucial for optimizing their performance in these applications. Here, we computationally investigate a dataset of 43 unbranched cata-condensed PBHs in their first singlet excited state (S₁), revealing clear correlations between molecular structure and electronic properties. By analyzing these molecules through their annulation patterns—specifically the arrangement of linear (L) and angular (A) tricyclic subunits and tetracyclic zigzag (Z) and curve (C) motifs—we establish a predictive hierarchy (L > Z > C > A) for the location of unpaired electrons and Baird-antiaromaticity. This structural approach enables semiquantitative prediction of key properties, including excitation energies, magnetic response, and singlet fission capability. Notably, we find that singlet fission propensity is dependent on both the length of the Longest L sequence and the position of the L motifs within the sequence. These insights, derived from the analysis of small tri- and tetracyclic components and validated on larger systems, provide a practical framework for understanding and designing PBH-based materials.","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/poc.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143689966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Mechanism and Diastereoselectivity of the Photo-/NHC Cocatalyzed Fluoroacylation of Benzofurans: A Theoretical View 光/NHC共催化苯并呋喃氟酰化反应机理及非对映选择性：理论观点

IF 1.9 4区化学

Journal of Physical Organic Chemistry Pub Date : 2025-03-12 DOI: 10.1002/poc.70007

Zehua Li, Jiying Liu, Jiabin Liu, Panpan Bao, Huixian Jing, Hui Chen, Wenjing Zhang

{"title":"Mechanism and Diastereoselectivity of the Photo-/NHC Cocatalyzed Fluoroacylation of Benzofurans: A Theoretical View","authors":"Zehua Li, Jiying Liu, Jiabin Liu, Panpan Bao, Huixian Jing, Hui Chen, Wenjing Zhang","doi":"10.1002/poc.70007","DOIUrl":"https://doi.org/10.1002/poc.70007","url":null,"abstract":"<div>\u0000 \u0000 The NHC/photoredox cocatalysis proposes an alternative to conventional methods for acylation of the unsaturated bonds. But it is still a great challenge to effectively control the stereoselectivities stemming from couplings of the ketyl radicals and the alkyl radicals. In this work, we have selected the photo-/NHC cocatalyzed fluoroaroylation of benzofurans as the computational model for density functional theory (DFT) studies, intending to unveil mechanisms of the fluorine-induced diastereoselectivities and thus to provide guidance to future rational design of promising catalytic reactions with high stereoselectivities. The computational results reveal that a fluorine-bearing zwitterion intermediate is yielded after nucleophilic addition of the NHC catalyst to the acyl fluorides, because fluorine anion is a poor leaving group. The cross-coupling of the ketyl radical and the tertiary carbon radical is the diastereoselectivity-determining step, and the configuration with the bulky NHC-stabilized ketyl radical bonded trans to the α-fluorine substitution is energetically favor over that giving the cis configuration. The distortion–interaction energy calculations combined with the geometry analysis indicate that the repulsion of the α-fluorine atom on the neighboring carbon results in significant distortions of the two coupling partners in the cis-configuration transition state and therefore leads to high diastereoselectivities. In addition, it is unveiled that the nucleophilicity of the carbene atom could be substantially influenced by electron delocalization. Moreover, the steric hindrance arose from the N(2)-phenyl group warrants attention as it may reduce remarkable geometry distortions with approach of the acyl fluoride compound.\u0000 </div>","PeriodicalId":16829,"journal":{"name":"Journal of Physical Organic Chemistry","volume":"38 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0