A new synthetic approach for novel 4-substituted-5-nitroimidazoles
作者:Maxime D. Crozet、Patricia Perfetti、Mustapha Kaafarani、Patrice Vanelle、Michel P. Crozet
DOI:10.1016/s0040-4039(02)00767-0
日期:2002.6
A newsyntheticapproach, involving an SRN1 reaction of the anion of 1-methyl-4-phenylsulfonyl-methyl-5-nitro-1H-imidazole with 2,2-dinitropropane and a radical anion or a concerted radical reductive elimination of sulfonyl and nitro groups affords an original 5-nitroimidazole bearing a trisubstituted ethylenic double bond at 4-position.
Cleavage Reactions of Radical Anions that Range from Homolytic to Heterolytic within the Same Family of Compounds
作者:Zi-Rong Zheng、Dennis H. Evans、Soazara Chan-Shing、Jean Lessard
DOI:10.1021/ja9922779
日期:1999.10.1
nitrite from the radical anions were 3 × 106, 5 × 106, and 240 s-1 for 1a−c, respectively. Comparison of these potentials with those of related compounds demonstrates that reduction of the nitroalkyl portion of the molecule occurs in 1a and 1b while in 1c the electron is added to the nitrophenyl group. Thus, using previously defined terminology, the cleavage of the radical anions of 1a and 1b to give nitrite
A facile preparation of dialkyl phosphonate compounds from sterically hindered p-nitrocumyl halides through the SRN1 mechanism
作者:Jong Uk Rhee、Glen A. Russell、Woonphil Baik
DOI:10.1016/s0040-4039(98)01925-x
日期:1998.11
p-Nitrobenzyl phosphonate anion with p-nitrocumyl halides gives a good yield of the coupling product dialkyl[(1,1-dimethyl-1,2-di-(p-nitrobenzyl)ethyl] phosphonates through the SRN1 mechanism. The reaction was greatly accelerated by sunlamp irradiation but inhibited by the radical scavenger (t-Bu)2NO•.
p与硝基苄膦酸酯阴离子p -nitrocumyl卤化物给出偶合产物二烷基[(1,1-二甲基-1,2-二- (良好的产量p硝基苄基)乙基]膦酸酯通过S RN 1个机构,将反应在日光照射下被大大加速,但被自由基清除剂(t- Bu)2 NO •抑制。
Thermosetting polymer of ultrahigh resistance to heat
申请人:NIPPON OIL CO. LTD.
公开号:EP0389076A1
公开(公告)日:1990-09-26
Thermosetting polymers predominantly of a polybutadiene as a base polymer is disclosed, which polybutadiene is so configured as to have a vinyl content of not less than 40% by mol of the total monomer mol and a crosslink reactivity of at least 70% of the vinyl content. The cured polymer is ultrahighly resistant to heat and particularly applicable as an engineering plastics. Also disclosed is a process for producing the thermosetting polymer with the use of a specific initiator.
Resin compositions are disclosed for use as engineering plastic grades. A selected class of cured polybutadienes of specified configuration is crosslinked with a selected class of thermoplastic or thermosetting resins. The resultant composition is highly capable of exhibiting superior heat distortion temperature, great impact strength and adequate dielectric constant.