Synthesis, optical properties, and acid–base indicating performance of novel ketene hydroxybenzylidene nopinone derivatives

Abstract

Three ketene nopinone derivatives (1–3) were successfully synthesized from β-pinene derivative nopinone.

Synthesis, optical properties and application of a set of novel pyrazole nopinone derivatives

“…Compounds 1-3 were first synthesized by a condensation reaction from nopinone by a reported method [26], then compounds 4-6 were further synthesized through two steps, as shown in Scheme 1. These novel compounds were characterized by IR, MS, and HRMS, and these analyses confirmed compounds 4-6 to be pyrazole nopinone derivatives.…”

“…In addition, some novel nopinone derivatives have been synthesized for a functional application in recent years. Two useful ketene hydroxybenzylidene nopinone derivatives were provided for an application on acid-base indicator [26], and nopinone derivatives could further be used in fluorescent materials.…”

“…It also told that much TFA or potassium tert-butoxide could enhance fluorescence of compound 6 in ethanol.The results showed that the addition of TFA or potassium tert-butoxide could significantly change the fluorescence spectra of compounds 4-The reason for quenching fluorescence by TFA might be a collision with H + (a proton transfer reaction in the excited state)[33]. The -OH group in compounds 4 and 6 could easily response with OHof potassium tert-butoxide, and deprotonation occurred and led to a fluorescence enhancement[26].…”

Cyclohexanone-Based Chalcones as Alternatives for Fuel Additives

“…Chalcones and their analogues are either found in plants or obtained from specific synthetic pathways and have shown numerous applications as liquid crystal materials, pH sensors, , nonlinear optical materials, , as well as their remarkable biological properties: antitumor, , anti-inflammatory, antifungal, − antibacterial, ,, and antioxidant. − Some of these properties can be related to fuel applications, such as energy efficiency or additives, − and often fuels such as ethanol and biofuels are prone to suffer from degradation and oxidation problems, mainly caused by micro-organisms − or even the lower combustion capacity, therefore, a lower energy efficiency. − …”

Nopinone-Based Difluoroboron β-Diketonate Complex: Aggregation-Induced Emission and Solvatochromism

“…诺蒎烷基有机荧光化合物 具有低毒、低成本、水溶性强等优点, 结构中的刚性双 环结构有助于改善荧光化合物的光学性能. 近年来, 诺 蒎烷基有机荧光化合物已被成功用作 pH 值指示剂、细 胞染色剂、荧光探针等 [43][44][45][46] 1 H NMR (400 MHz, CDCl 3 ) δ: 8.1～8.3 (m, 3H), 7.9 (dd, J＝13.2, 6.8 Hz, 2H), 7.9～7.8 (m, 3H), 7.8 (dd, J＝8.5, 1.9 Hz, 1H), 7.6～7.5 (m, 2H), 2.9 (qd, J＝14.8, 3.0 Hz, 2H), 2.8 (t, J＝5.5 Hz, 1H), 2.7 (dt, J＝10.9, 5.7 Hz, 1H), 2.4 (tt, J＝6.0, 3.0 Hz, 1H), 1.5 (d, J＝10.1 Hz, 1H), 1.4 (s, 3H), 1.0 (s, 3H); 13…”