Oxygen-containing Compounds with More than One Ring

Oxygen-containing Compounds with More than One Ring, Although alkyl-lithium reagents do not in general add to unstrained simple double bonds, chloromethoxymethyl-lithium adds cis- to simple double bonds to give tetrahydrofuran derivatives, e.g. (259).  

ABX spectrum (although it is not clear that a correct ABX analysis was used) and interpreted the chemical shifts and coupling contants in terms of possible conformations. 

As predicted from ionization potential values, the reactivity of isobenzo-furan (261) with singlet oxygen is found to be between that of furan and 1,3-diphenylisobenzofuran.  

The reaction of Mannich bases of cycloalkanones with ethyl vinyl ether gives rise to bicyclic dihydropyran derivatives (265), several of whose reactions were investigated.  

Maitte, and H. Petit, Bull. Soc. chim. France, 1972, 2783. 

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