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Partially fluorinated heterocyclic compounds Part IX The syntheses of 4567tetrafluorobenzobfuran
Reactions of cyclohexadienes Part XII Some dienamines and dimethyl acetylenedicarboxylate
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acetic acid added addition afforded Amer anhydride aqueous aromatic atom band base benzene boiling bond bromide Calc carbon tetrachloride carbonate Chem Chemical Chemistry chloride chloroform chromatography compound concentrated containing cooled corresponding crystallised decomp derivatives described dissolved dried ester ethanol ether evaporated extracted filtered followed formation formed Found fragmentation further gave give heated hydrogen hydrogen bromide hydroxide i.r. spectrum identical indicated isolated ketone light petroleum mass material method methyl mixed mixture n.m.r. spectrum needles observed obtained occurred oxidation peak Ph Ph position potassium prepared presence prisms protons reaction reduced refluxed removed requires residue ring room temperature Scheme separated showed shown signals silica similar sodium solid solution solvent spectra stirred structure substituents synthesis Table treated treatment washed yellow yield