... Allyl 2, 4-Dichlorophenyl Ether 2- Allylphenol 2- Methyldihydrobenzofuran „ Isomerization of 2- Allylphenol to 2- Propenylphenol C-Alkylation Preparation of 2- Cinnamylphenol 22 * 22 23 26 26 26 27 27 27 ... give XVII CH3C=CHCO2C2H6 CH3C-CHCO2C2H5 I II I OCH2CH=CHC«H6 O CH(C6H6)CH=€H8 XVI XVII CH3C—CHCO2C2HB CH CH=CHC H XVIII However, when the rearrangement is effected by heating at 26 0° for four hours... (Claisen, 19 12) , was first observed when ethyl O-allylacetoacetate was subjected to distillation at atmospheric pressure in the presence of ammonium chloride.1 '2 OCH2CH=CHj! CH2CH=CH2 CH3C=CHCO2C2HB -»