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The carbonylation of the substituted 2-butyne-1,4-diols, RArC(OH)≡C(OH)ArR (Ar, 2,5-dimethylthienyl; R, alkyl) was studied by using Pd(OAc) 2 /I 2 as the catalyst in benzene under pressure. The diols bearing methyl or isopropyl group as the alkyl substituent gave photochromic fulgide (4a or 4b). On the other hand, the carbonylation of the diol bearing bulky t-butyl group did not afford...
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