mp 148-150"(I, n= 3), isomeric with the known adduct of the isobenzofuran with cis- cycloheptene (11, n= 3), mp 183-185, 6 mmp 131-145". It is apparent, therefore, that trans- cycloheptene is the primary product from trans-1, 2-~ ycloheptene thionocarbonate in the elimination reaction. This is the first instance in which this highly strained olefin has been produced and detected; isolation in a pure state is obviously desirable and investigations ...
