共查询到20条相似文献,搜索用时 15 毫秒
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Alajarín M Bonillo B Sanchez-Andrada P Vidal A Bautista D 《The Journal of organic chemistry》2007,72(15):5863-5866
Bis(ketenimines), in which the two heterocumulenic functions are placed in close proximity on a carbon skeleton to allow their mutual interaction, show a rich and not easily predictable chemistry. Intramolecular [2 + 2] or [4 + 2] cycloadditions are, respectively, observed when both ketenimine functions are supported on either ortho-benzylic or 2,2'-biphenylenic scaffolds. In addition, nitrogen-to-carbon [1,3] and [1,5] shifts of arylmethyl groups in N-arylmethyl-C,C-diphenyl ketenimines are also disclosed. 相似文献
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Jae Wook Lee Ho Jung Son Jae Ho Lee Yeon Eui Jung Geal Jung Yoon Myung Hwan Park 《合成通讯》2013,43(23):3741-3746
Novel 5-functionalized-2,8-diazabicyclo[4.3.0]nonane derivatives 5 were synthesized from epoxide 1 through 4 steps in 46.7~52.6% yield. 相似文献
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《Tetrahedron letters》1986,27(24):2695-2698
The use of dithiane chemistry to synthesize functionalized azomethine ylides which are then employed in [3+2] cycloaddition chemistry is described. The advantages of this methodology as well as an approach to the lycorenine alkaloid system are presented. 相似文献
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Benzocyclobutenes linked by two-carbon bridges undergo flashpyrolytic conversion to [2.2.2]cyclophanes. 相似文献
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Unsaturated dialkylketenes 7a, 7b and 7c undergo intramolecular [2 + 2]cycloadditions to give 8a (45%), 9b (23%) and 9c (45%). Intramolecular cycloadditions of dialkylketenes give higher yields than intramolecular cycloadditions of monoalkylketenes, even though dialkylketenes are less reactive than monoalkylketenes. An intramolecular competition experiment with ketene 17 establishes that trans-alkenes are approximately 33 times more reactive than cis-alkenes in intramolecular cycloadditions. Ketene 36 furnishes 22% of the expected bicyclo[3.2.0]heptanone 37 and 28% of bicyclo[3.1.1]heptanone 38. 相似文献
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E. E. Netreba E. A. Sarnit S. V. Shabanov A. A. Velikozhon N. V. Somov 《Russian Journal of Coordination Chemistry》2017,43(2):86-92
The coordination polymer of cobalt(II) nitrate with bicyclic bis(urea), 4,4,10,10-tetramethyl-1,3,7,9-tetraazaspiro[5.5]undecane-2,8-dione (Sk) {[Co(C11H20N4O2)2(H2O), Co(C11H20N4O2)2(H2O)2]4+(NO 3 - )4} n (I), is synthesized for the first time, and its atomic structure is determined (CIF file CCDC no. 925792). The crystals of compound I are monoclinic: space group P2/c, a = 26.1284(6), b = 7.1763(2), c = 17.1825(5) Å, β = 105.042(3)°, V = 3111.43(15) Å3, ρcalcd = 1.474 g/cm3, Z = 2. The powder X-ray pattern at 293 K is refined using the Rietveld method to confirm the single-phase character of the obtained sample of powdered compound I: a = 26.1456(9), b = 7.1810(4), c = 17.1997(11) Å, β = 105.016(3)°, V = 3119.0(3) Å3. The content of the major phase of compound I in the sample is 100 ± 1%, and impurity phases are absent. The crystal of compound I contains two types of chains oriented along the crystallographic direction [001] with similar structures but differed in the coordination numbers of the cobalt atoms. The Co(1) atom has a coordination number of 5 (trigonal bipyramid), and the coordination number of the Co(2) atom is 6 (octahedron). The nitrate anions are uncoordinated. 相似文献
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The reaction of dimercaptoethylphosphane HP(CH2CH2SH)2 with tris (diethylamino)phosphane or tris(diethylamino)arsane leads in high yields to the title compounds. 相似文献
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Synthesis and structure of 2,5,7,10-tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione 总被引:1,自引:0,他引:1
M. O. Dekaprilevich A. N. Kravchenko L. I. Khmel'nitskii O. V. Lebedev Yu. T. Struchkov Yu. A. Strelenko 《Russian Chemical Bulletin》1995,44(1):131-133
2,5,7,10-Tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione, a regioisomer of the previously known 2,5,7,8-tetramethyl-2,4,8,10-tetraazabicyclo[4.4.0]decane-3,9-dione, has been synthesized, and its structure has been established by X-ray diffraction analysis. The bicyclic system of this molecule is formed by two heterocyclescis-annelated through the C(1)-C(6) bond. The relative configurations of the asymmetric centers areS for C(5), andR for C(7). In the monohydrate crystal studied, the molecules are linked by O...H-Ow and O...H-N type H-bonds forming a three-dimensional framework.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 136–138, January, 1995. 相似文献
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果蝇 ( Tephritidae)对水果生产有严重的危害 .热带果蝇寿命较长 ,具有很强的迁徙能力和繁殖能力 .因此开展果蝇生物防治和控制措施的相关研究具有重要的意义 [1,2 ] .Baker等 [3]发现性成熟的雌B.dorsalis果蝇 ,性腺分泌物中包含有螺环缩酮化合物 2 ,8-二甲基 - 1 ,7-二氧杂螺 [5 ,5 ]十一烷 ( 1 ) .Bactrocera Latifrons( Hendel)果蝇的雄性腺体分泌物中也存在螺环缩酮 1 [4 ] ,另外在 rove甲虫腹梢分泌物中也分离出 1 [5] ,螺环缩酮不仅作为性信息素组分存在于许多果蝇腺体中 ,而且作为结构单元存在于许多复杂的有强烈生理活性的天然… 相似文献
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A facile one-step synthesis of spiro[4.5]deca-6,9-diene-2,8-dione(1) from p-methoxyphenylacetyl chloride via a Friedel-Crafts acylation followed by ring closure is reported. 相似文献
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