1,3- and 1,2-Carbo-migration of 2-vinylbicyclo[2.2.2]octenols: facile and concise synthesis of bicyclo[4.2.2]/[3.2.2] skeleton by two/one-carbon ring expansion.

The synthesis of a series of bicyclo[4.2.2]octenones and bicyclo[3.

[Contrastive analysis of volatile oil from Serissa serissoides in different seasons].

Objective: To provide the foundation for reasonable utilization by analysing the essential oils from Serissa serissoides in different seasons.

Method: Essential oils were obtained by steam distillation. The chemical components were separated and identified by gas chromatography-mass spectrometer (GC-MS).