Bimanes. 23. The synthesis and properties of vinyl-9,10-dioxabimanes

Syntheses and useful reactions of syn-vinylbimanes are reported. The precursors are syn-(ethyl,methyl)bimane (4,6-diethyl-3,7-dimethyl-1,5-diazabicyclo[3.3.0]octa-3,6-diene-2,8-dione) (syn-(CH 3 CH 2 ,CH 3 )B) (2) and syn-(ethyl,chloro)bimane (4,6-diethyl-3,7-dichloro-1,5-diazabicyclo[3.3.0]octa-3,6-diene-2,8-dione) (syn-(CH 3 CH 2 ,Cl)B) (4)