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H2{SO}4-silica as an efficient and chemoselective catalyst for the synthesis of acylal from aldehydes under solvent-free conditions
Acylals aldehydes catalysis solvent-free reactions
2010/4/9
A variety of aldehydes react with acetic anhydride in the presence of a catalytic amount of H2SO4-silica to afford the corresponding 1,1-diacetates (acylals) in excellent yields. Ketones are not affec...
New Flame-Retardant Poly(ester-imide)s Containing Phosphine Oxide Moieties in the Main Chain: Synthesis and Properties
Flame-retardant polymers hosphine oxide moieties N-(3,3-diphenylphenyl phosphine oxide) bistrimellitimide diacid chloride romatic diols
2010/4/13
Six new flame-retardant poly(ester-imide)s (9a-f) with high inherent viscosity and containing phosphine oxide moieties in the main chain were synthesized from the polycondensation reaction of N,N-(3,3...
Synthesis of Vertilecanin C and Two New Derivatives of Vertilecanin A via Nicotinic Acid
Vertilecanin A Vertilecanin C diarylketones Nicotinic acid
2010/4/16
Vertilecanin C and 2 new phenyl-substituted derivatives of vertilecanin A were synthesized. Lithiation of 5-benzoylpicolinamide with BuLi at -78 °C followed by treatment with methyl bromoacetate gave ...
Synthesis of Nitrogen-Containing Heterocycles from the Reaction of Amidrazones with a-Haloesters
Amidrazones a-haloesters 4,5-dihydro-1,2,4-triazin-6-one
2010/4/16
The reaction of amidrazones 1 with a-haloesters 2 formed 1,3,5-substituted 4,5-dihydro-1,2,4-triazin-6-ones (4a-z) rather than 1,2,4-triazin-5-one derivatives (5a-z). The microanalysis and spectral da...
Synthesis of 2-Acylamino, 2-Aroylamino and Ethoxycarbonyl Imino-1,3,4-thiadiazoles as Antitumor Agents
1,3,4-Thiadiazole acetyl chloride benzoyl chloride ethyl chloro formate antitumor activity
2010/4/16
2-Amino-1,3,4-thiadiazoles compounds (2a-e) were obtained from the reaction of thiosemi carbazide with 2-cyanomethoxyphenoxyacetonitriles (1). Mono acylamino, mono aroylamino and diethoxycarbonyl imin...
Synthesis of n-Alkylnaphthalenes via Semicarbazones
Alkylnaphthalenes Semicarbazones Wolff-Kishner reductions Alkyl-1-naphthyl ketones Grignard reaction
2010/4/19
A number of 1-n-alkylnaphthalenes were prepared via the respective semicarbazones. The semicarbazones were reduced by modified Wolff-Kishner reductions to give 1-n-alkylnaphthalenes in excellent yield...