To investigate the effects of different aging times, three An–tea samples were selected for comparison with a non-aged sample as control (CK, one-year-old) and labeled high-aged (HAS, 12 years old), medium-aged (MAS, 7 low-aged (LAS, 2 old). Changes in volatile components investigated using headspace–solid-phase microextraction (HS-SPME) combined gas chromatography–mass spectrometry (GC-MS). Th...

• A Cu-catalyzed 100% atom–efficient amidation and esterification reaction based on the of cyclopropenones with amines or alcohols, is shown. Both soluble solid Cu catalysts are catalytically competent, a Cu-containing metal–organic framework (MOF) particularly active reusable. The can be performed in variety solvents conditions, including water at different pHs, which defined as click reaction...