Acetyl chloride Acetylenedicarboxylic acid

Both diethyl acetylenedicarboxylate and chlorofumarate have found frequent application as the second component, but other unsaturated acid derivatives are acceptable. The initially formed aryloxyalkenoic acids or their esters (471) are readily cyclized with acid or acetyl chloride. 

Acetylenedicarboxylic acid, dimethyl ESTER, 32, SS Acetylenic glycols, 39, 57 2- -Acetylphenylhydroquinone, 84,1 S-ACETYL-n-VALERIC ACID, 31, 3 Acid chlorides, 39, 19 synthesis of, 37, 69... 

Benzo[c]thiophene readily forms adducts with maleic anhydride (m.p. 153°-154°,5 6 148°-152°52), dimethyl acetylenedicarboxylate (see above),61 and A-phenylmaleimide (to give 62).52,61 In the last case the exo and endo isomers of the adduct may be separated by fractional crystallization.52 Benzo[c]thiophene reacts with acetyl nitrate by 1,3-addition in preference to substitution.6 It exhibits halochromy with concentrated sulfuric acid, trichloroacetic acid, and stannic chloride.62... 

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See also in sourсe #XX -- [ , ]

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