Non-equilibrium phase transition kinetics under high pressure depends on the compression time scale and rate. The studies require time-resolved diagnostics to be compatible with different time scales. Here we report the time-resolved X-ray diffraction (XRD) and dynamic diamond anvil cell (dDAC) system which is recently developed at the BL15U1 beamline of Shanghai Synchrotron Radiation Source (SSRF). There are two rapid loading methods in dDAC, the first one uses membrane and the second one uses piezoelectric ceramic. Both two methods can dynamically compress the pressure of the DAC sample chamber from atmosphere up to 300 GPa within millisecond scale (20 ?m culet is chosen), and the time-resolved XRD datum are obtained correspondingly. A new type of piezoelectric ceramic dDAC is designed with single side or double sides drive, which can realize extreme high pressure above 300 GPa with fast compression rate of 13 TPa/s. During the rapid compression process, the X-ray diffraction spectrum are collected continuously and simultaneously. The XRD detector is Pilatus 3X 900k, which has 2 ms resolution under 500 kHz frame rate. The millisecond time-resolved XRD and high pressure rapid compression system developed on BL15U1 of SSRF enrich the high pressure research tool and enable the ability of the beamline to carry out extreme high pressure experiments, non-equilibrium phase transition and related scientific researches. Non-equilibrium phase transition kinetics under high pressure depends on the compression time scale and rate. The studies require time-resolved diagnostics to be compatible with different time scales. Here we report the time-resolved X-ray diffraction (XRD) and dynamic diamond anvil cell (dDAC) system which is recently developed at the BL15U1 beamline of Shanghai Synchrotron Radiation Source (SSRF). There are two rapid loading methods in dDAC, the first one uses membrane and the second one uses piezoelectric ceramic. Both two methods can dynamically compress the pressure of the DAC sample chamber from atmosphere up to 300 GPa within millisecond scale (20 ?m culet is chosen), and the time-resolved XRD datum are obtained correspondingly. A new type of piezoelectric ceramic dDAC is designed with single side or double sides drive, which can realize extreme high pressure above 300 GPa with fast compression rate of 13 TPa/s. During the rapid compression process, the X-ray diffraction spectrum are collected continuously and simultaneously. The XRD detector is Pilatus 3X 900k, which has 2 ms resolution under 500 kHz frame rate. The millisecond time-resolved XRD and high pressure rapid compression system developed on BL15U1 of SSRF enrich the high pressure research tool and enable the ability of the beamline to carry out extreme high pressure experiments, non-equilibrium phase transition and related scientific researches.
o-Quinone derivatives are not only a variety of active and important intermediate, but also widely used in the synthesis of natural products and medicinal chemistry. In the present study, the Sc(III) catalyzed aza-Michael addition to o-quinone methides by amines for the synthesis of Betti base derivatives was developed. The reaction was performed in a sealed tube at 90 ℃ for 4 h and the products were obtained in moderate to good yields (76%~96%).
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