A New General Route to Thiophenophanes: Synthesis and Properties of [n](2,5)Thiophenophane-1,n-diones
摘要:
A series of [ n]( 2,5) thiophenophane-1, n-diones ( 5) ( n = 9, 10, 12, 14, 16, and 20) were synthesized in a simple four-step route starting from the appropriate 1,omega-oligomethylenedicarboxylic acids. The bis-( halomethylketones) ( 6), which were obtained by successive treatment of the diacids with SOCl2, diazomethane, and HBr or HCl, were cyclized by Na2S under high dilution conditions. The obtained monomeric cyclic diketosulfides ( 4) were condensed with glyoxal in MeOH by slowly adding dilute NaOMe affording 5. The thiophene-2,5-dicarbonyl moiety of 5 ( n = 9) is significantly deformed as shown by X-ray crystallography, and the effect of the strain is reflected in the C=O stretching frequencies and the pi-pi* and the n-pi* absorptions.
Alkylation of benzene with α-diazoketones via cycloheptatrienyl intermediates
作者:M. Anthony McKervey、D. Noel Russell、M. Fiona Twohig
DOI:10.1039/c39850000491
日期:——
Benzyl ketones can be synthesised efficiently from benzene and α-diazoketones with sequential catalysis by rhodium(II) trifluoroacetate and trifluoroacetic acids; the process involves cycloheptatrienylintermediates.
The Acid Catalyzed Decomposition of Diazo Compounds. I. Synthesis of Oxazoles in the BF<sub>3</sub>Catalyzed Reaction of Diazo Carbonyl Compounds with Nitriles
作者:Toshikazu Ibata、Ryohei Sato
DOI:10.1246/bcsj.52.3597
日期:1979.12
The BF3-catalyzed decomposition of diazo carbonyl compounds in nitriles have afforded the corresponding oxazoles in high yields. This method is applicable to diazo carbonyl compounds such as m- and p-substituted diazoacetophenones, ethyl diazoacetate, 1,2-diphenyl-2-diazoethanone, dibenzoyldiazomethane, and dimethyl diazomalonate. Bis(diazo ketone)s such as terminal bis(diazoacetylated) alkanes (III1−4:
Synthesis of macrocyclic oxo-crown ethers from αω-bis-diazo-ketones and polyethylene glycols
作者:Sunanta Kulkowit、M. Anthony McKervey
DOI:10.1039/c39810000616
日期:——
Derivatives of macrocyclic crown ethers in which two ethereal oxygen atoms have been replaced by carbonyl groups have been synthesised by the bis-(acetylacetonato) copper-catalysed cyclisation of αω-bis-diazo-ketones with polyethyleneglycols; three such oxo-crownethers complex with potassium ion in chloroform.
Fahr,E., Justus Liebigs Annalen der Chemie, 1960, vol. 638, p. 1 - 32
作者:Fahr,E.
DOI:——
日期:——
Canonica; Bacchetti, Atti della Accademia Nazionale dei Lincei, Classe di Scienze Fisiche, Matematiche e Naturali, Rendiconti, 1951, vol. <8>10, p. 479,484