Synthesis of the α-primeveroside of methyl salicylate
Summary1. An anomer of a natural glucoside — monotropitoside — has been synthesized for the first time.2. This method is suitable for the synthesis of anomeric oligosides of phenols.
Zur Glucosidbildung aus 1‐Acyl‐glucosen
Die Darstellung von D-Glucosiden, vor allem der α-Reihe, wurde an weiteren 1-Acyl-D-glucosen untersucht. Einige kinetische Messungen wurden bei dieser Reaktion durchgefuhrt.
Failure analysis for poor solderability of Au surface of PCB
Nonwetting is one of the common problems and is always rejected in electronic assemblies. ENIG pads of a PCBA exhibited nonwetting after lead-free reflow soldering. With the aid of stereomicroscope, SEM&EDS and XRF, a series of analysis was performed. And after visual inspection, surface and cross section analysis, thickness measurement and solderability test, it can be inferred that oxidation of plating surface was the main reason for nonwetting, and corrosion in Ni plating caused an adverse impact on solderalibity.