Regioselective Multicomponent Sulfonylation/Cyclization of Unactivated Alkenes to Access Sulfonylated Six- and Seven-Membered Cyclic Enamines via SO Insertion.

Radical cascade cyclization of alkenes involving the insertion of sulfur dioxide has proven to be a promising tool to access sulfonylnated heterocycle compounds, whereas cyclization of unactivated alkenes has been much less explored. Here, we developed a three-component cascade of unactive alkenes with sulfur dioxide and aryldiazonium tetrafluoroborates to generate sulfonylated tetrahydropyridines and azepines via the cleavage of alkenyl C-H bonds. Moreover, this protocol exhibited excellent chemical and regioselectivity and compatibility with broad functional groups.

[Quantitive Analysis of Contents in Yogurt and Application Research with FTIR Spectroscopy].

Yogurt is a food produced by bacterial fermentation of milk. All kinds of nutrition components are changing dramatically in the process of fermentation. Therefore, it is important to establish a fast and efficient measurement technology of yogurt nutrition, which is also an important goal for food safety supervision in terms of monitoring the yogurt production process in real time.