Complexes of La(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ), Er(Ⅲ),Yb(Ⅲ)and Y(Ⅲ)with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characte- rized by elemental ana...Complexes of La(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ), Er(Ⅲ),Yb(Ⅲ)and Y(Ⅲ)with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characte- rized by elemental analysis,molar conductance,i.r.,UV and^1H n.m.r. spectra,magnetic measurements,X-ray powder diffraction and DTA.展开更多
The piperonal electron affinity was studied using pulse radiolysis technique. The electron transfer reaction process between piperonal and anthraquinone-2-sulfate was observed in the pH 7 phosphoric acid salt buffer. ...The piperonal electron affinity was studied using pulse radiolysis technique. The electron transfer reaction process between piperonal and anthraquinone-2-sulfate was observed in the pH 7 phosphoric acid salt buffer. The transient absorption spectra of electron transfer re-action between piperonal and anthraquinone-2-sulfate were obtained, and the initial proof of the electron transfer between electron donor and acceptor was provided directly. The one-electron reduction potential of piperonal was determined to be ?0.457 V.展开更多
Nordihydroguaiaretic acid (NDGA) has been synthesized in nine steps from piperonal using Stobbe condensation as the key step with high yield. By this approach, five relative natural products were obtained.
Machilin A, isolated from the bark and root of Machilus thunbergii Sieb. et Zucc., was synthesized in eight steps from piperonal, with the coupling reaction as a key step.
±)-Butyl ester of rosmarinic acid 1 was synthesized by 5-step reactions through the two key intermediates 2 and 3, the total yield was 23.9% and 25.1%, respectively.
Unsymmetrical dendrons 1,2 and 3 were easily prepared according to a novel convergent strategy from 3,4-methylenedioxybenzaldehyde as starting material.
文摘Complexes of La(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ), Er(Ⅲ),Yb(Ⅲ)and Y(Ⅲ)with piperonal isonicotinoyl hydrazone(HPIN) have been synthesized in DMF and EtOH.The complexes have been characte- rized by elemental analysis,molar conductance,i.r.,UV and^1H n.m.r. spectra,magnetic measurements,X-ray powder diffraction and DTA.
基金supported by the National Natural Science Foundation of China(Grant No.30100035)Natural Science Foundation of Fujian(Grant No.C0510029).
文摘The piperonal electron affinity was studied using pulse radiolysis technique. The electron transfer reaction process between piperonal and anthraquinone-2-sulfate was observed in the pH 7 phosphoric acid salt buffer. The transient absorption spectra of electron transfer re-action between piperonal and anthraquinone-2-sulfate were obtained, and the initial proof of the electron transfer between electron donor and acceptor was provided directly. The one-electron reduction potential of piperonal was determined to be ?0.457 V.
基金We are grateful to the National Natural Science Foundation of China (NSFC QT program No.20172023) and Natural Science Foundation of Gansu province (ZS001-A25-003-Z).
文摘Nordihydroguaiaretic acid (NDGA) has been synthesized in nine steps from piperonal using Stobbe condensation as the key step with high yield. By this approach, five relative natural products were obtained.
文摘Machilin A, isolated from the bark and root of Machilus thunbergii Sieb. et Zucc., was synthesized in eight steps from piperonal, with the coupling reaction as a key step.
文摘±)-Butyl ester of rosmarinic acid 1 was synthesized by 5-step reactions through the two key intermediates 2 and 3, the total yield was 23.9% and 25.1%, respectively.
文摘Unsymmetrical dendrons 1,2 and 3 were easily prepared according to a novel convergent strategy from 3,4-methylenedioxybenzaldehyde as starting material.
