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A highly enantioselective conjugate addition of indolizine and its analogues with α,β-unsaturated 2-acyl imidazoles has been developed.

Coreopsis tinctoria flowering (CTF) tops from the Kunlun Mountains in Xinjing (north-western China) have been used for tea production for about a century. This study was to assess antioxidant, nitrite-scavenging and N-nitrosamine inhibitory and antimicrobial activities of the essential oil extracted from CTF tops. The essential oil was extracted through hydrodistillation and its chemical compositions were analysed by GC–MS. Seventy compounds of the oil were identified, representing 81.87% of total oil. The antioxidant capacities of the oil with IC50 values for scavenging DPPH and ABTS were 287.66 ± 12.60 and 1.251 ± 0.127 μg mL− 1, respectively. The nitrite-scavenging and N-nitrosamine inhibitory activities (IC50) were 0.3912 ± 0.0127 and 0.6564 ± 0.036 μg mL− 1, respectively. The oil has a certain antimicrobial capacity, but its capacity was weaker than that of penicillinG (24 μg mL− 1). The oil showed antioxidant and antimicrobial capacities and had a stronger nitrite-scavenging and N-nitrosamine inhibitory properties.

As a core structure of nature photosynthesis, porphyrin has good light, thermal and chemical stability. In the past two decades, porphyin based dye-sensitized solar cells (DSSC) has attracted much attention relevant to global environmental issues. Up to date, they exhibit the best performance with a benchmark efficiency of 13% reported in 2014 for dye-sensitised solar cells. The progress of porphyrins and their derivatives applied in DSSC from the point of view of molecular engineering design correlated with photovoltaic performance is systematically summarized. Keywords dye-sensitized solar cells; porphyin; molecular engineering design; photovoltaic performance