Proton exchange and isomerisation reactions of photochromic and reverse photochromic spiro-pyrans and their merocyanine forms
文献情報
Photochromic 1′,3′,3′-trimethyl-6,8-dinitro-spiro- [2H-1-benzopyran-2,2-indoline], (6,8-dinitro BIPS) has been studied in different solvents using 1H-NMR techniques, UV/visible spectroscopy, X-ray diffraction and electrospray ionisation mass spectroscopy (ESI-MS). Molar decadic absorption coefficients for 6,8-dinitro BIPS were found to range between 35000–45000 d mol-1 cm-1. 1H–1H NOESY and 1H-NMR experiments have established that in solution the merocyanine form of 6,8-dinitro BIPS is in rapid exchange between the trans-trans-cis (TTC) and trans-trans-trans (TTT) isomers. The 3B proton on the central bridging double bond of spiro-pyran merocyanines is labile in organic solvents. The closed form of 6,8-dinitro BIPS enantiomerises about the spiro C(2) carbon at a rate of 18 s-1 at 300 K. The activation energy for this process was estimated to be 46 kJ mol-1 using dynamic NMR.
関連文献
Continuous flow kinetic resolution of a non-equimolar mixture of diastereoisomeric alcohol using a structured monolithic enzymatic microreactor
Katarzyna Szymańska, Zofia Hrydziuszko, Jolanta Bryjak
DOI: 10.1039/C8RE00177D
Correction: Photonic contacting of gas–liquid phases in a falling film microreactor for continuous-flow photochemical catalysis with visible light
Thomas H. Rehm, Patrick Löb, Albert Renken
DOI: 10.1039/C9RE90029B
Operation range extension via hot-spot control for catalytic CO2 methanation reactors
Jens Bremer
DOI: 10.1039/C9RE00147F
Nucleophilic construction of sulfate bonds: simplified access to polysulfates and polysulfonates
Weiwei Zhu, Fuchong Li, Jikun Liu, Xingyu Ma, Xianxing Jiang
DOI: 10.1039/C9RE00227H
Ruthenium polypyridyl complex-catalysed aryl alkoxylation of styrenes: improving reactivity using a continuous flow photo-microreactor
Eiji Yamaguchi, Nao Taguchi, Akichika Itoh
DOI: 10.1039/C9RE00061E
All-aqueous continuous-flow RAFT dispersion polymerisation for efficient preparation of diblock copolymer spheres, worms and vesicles
Sam Parkinson, Nicole S. Hondow, John S. Conteh, Nicholas J. Warren
DOI: 10.1039/C8RE00211H
Solid phase extraction based on the phase transition of poly(N-isopropylacrylamide): the extraction behaviour of lanthanide(iii) ions in highly acidic solutions
Ki Chul Park, Haruka Tateno, Takehiko Tsukahara
DOI: 10.1039/C7RE00060J
Continuous flow synthesis of ordered porous materials: from zeolites to metal–organic frameworks and mesoporous silica
Zhendong Liu, Jie Zhu, Ce Peng, Toru Wakihara, Tatsuya Okubo
DOI: 10.1039/C9RE00142E
Oxygen sensors for flow reactors – measuring dissolved oxygen in organic solvents
DOI: 10.1039/C9RE00253G
こちらもおすすめ
間溴苯甲酰腈の市場動向や研究トレンドはどうですか?
間 brom 苯甲酰腈は、合成化学や薬物化学において重要な Intermediate として使用されています。市場動向としては、その合成性と機能性により、研究開...
Methyl 2-amino-5-(trifluoromethyl)benzoateに適用される法規ガイドラインは何ですか?
CAS番号117324-58-0の塩酸メチル2アミノ-5-トリフルオロメチルベンゼートは、GHS分類により腐食性物質と判定されます。REACH規則では、製造、販...
3-ブロモ-1,3,4,5-四水化-2H-1-ベンザアゼピン-2-オンは安全ですか?
毒性があるため、適切な安全対策が必須です。皮膚や粘膜への刺激性が強く、吸入や誤飲により健康被害を引き起こす可能性があります。取扱時にはガスマスクや手袋、眼鏡を使...
三氟甲基ピリジン-2-甲アミン塩酸塩は安全ですか?
三氟甲基ピリジン-2-甲アミン塩酸塩は安全性に注意が必要です。毒性は低レベルですが、直接的接触や吸入は避けるべきです。適切な手袋や防塵マスクを着用し、密閉された...
1-エチル-4-(4-硝基フェニル)ピペリジンは安全ですか?
1-エチル-4-(4-硝基フェニル)ピペリジンは有毒であり、取扱には注意が必要です。保管や作業中に手袋を着用し、目や皮膚に接触しないように注意する必要があります...
1,1-ジメトキシプロパン-2-オンは安全ですか?
1,1-ジメトキシプロパン-2-オンは一般的に低毒性ですが、皮膚や目への刺激性があるため、取扱いには注意が必要です。蒸気や液体の吸入には有害な可能性があり、適切...
コバルト(II) 3,3'-{[(1S,2S)-1,2-ジメチルフENCYCLICALE-1,2-エチエンジイル]ビス[ニトロリルメチルイリデン]}ビス[4-オキソ-2-ペンテン-2-olate]について「に適用される法規ガイドラインは何ですか?
この化合物はCAS番号259259-80-8に対応しています。GHS分類では、毒性、燃焼性、反応性、炎症性を考慮に入れ、適切な危険性分類が行われます。REACH...
「カーバミル酸, N-[8-[[2-[[2-(2,6-ジオキソ-3-ピペリジニル)-2,3-ジオキソ-1,3-ジヒドロ-1H-イソイソインドール-4-イルオキシ]アセチル]アミノ]オクチル]-1,1-ジメチレチルエステル」はどのように保存すればよいですか?
この化合物は、冷却庫で-20℃の温度、乾燥した容器に保管し、直日光から保護する必要があります。湿度の高い環境や高温は避けてください。
掲載誌
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











![(1S,4aR,5R,7S,7aS)-1-(beta-D-Glucopyranosyloxy)-5-hydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-7-yl alpha-D-galactopyranoside structure (1S,4aR,5R,7S,7aS)-1-(beta-D-Glucopyranosyloxy)-5-hydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-7-yl alpha-D-galactopyranoside structure](https://static.chemtradehub.com/structs/817/81720-07-2-4ffd.webp)


