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A series of meso monosubstituted metalloporphyrins were synthesized to assess the structural chemistry of porphyrins with only one substituent. The structures of four nickel(II) and zinc(II) complexes with either alkyl or aryl residues indicate primarily planar macrocycles. This gives rise to a different type of π-interactions in the crystal and the formation of dimeric, trimeric or tetrameric porphyrin...
Ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate was smoothly lithiated at the 5-methyl position, when the 4-acetyl group was protected with a 5,5-dimethyl-1,3-dioxanyl group. The lithio anion was quenched with a variety of electrophiles such as alkyl halides, aldehydes, TMSCl, and Me 3 SnCl in good to excellent yields. The lithiation of the unprotected compound and the 4-acetyl group protected...
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