Synthesis and spectroscopic studies of some novel bicyclic organotin compounds
作者:C.H.W. Jones、R.G. Jones、P. Partington、R.M.G. Roberts
DOI:10.1016/s0022-328x(00)85072-x
日期:1971.10
A number of new bicyclic organotincompounds have been synthesised by treating the corresponding organic halide with (trialkyl- or triarylstannyl)sodium in liquid ammonia. syn-7-Bromo-2-norbornene yielded mainly the anti-7-trimethyltin derivative when treated with (trimethylstannyl)sodium, but gave a tricyclic compound on reaction with (triphenylstannyl)sodium. anti-7-Bromobenzonorbornadiene gave a
通过在液氨中用(三烷基-或三芳基锡烷基)钠处理相应的有机卤化物,已经合成了许多新的双环有机锡化合物。syn -7-溴-2-降冰片烯经(三甲基锡烷基)钠处理后主要生成抗-7-三甲基锡衍生物,但与(三苯基锡烷基)钠反应生成三环化合物。抗-7-溴苯并降冰片二烯产生顺/抗三甲基锡烷基类似物的混合物与似乎是三环衍生物的混合物。7-氯-2,5-降冰片二烯可以很容易地得到核心反应的7-三苯基锡烷基化合物,但其三甲基锡类似物的形成非常困难且不稳定。通过PMR光谱对化合物进行了表征,并讨论了其形成机理。将三甲基氢化锡加到2,5-降冰片二烯中得到exo和内-5-降冰片烯衍生物的混合物。13 C NMR,穆斯堡尔(Mössbauer)和红外光谱用于寻找锡原子与位于立体化学有利位置的CC双键之间的供体-受体相互作用,即。7-(三甲基锡烷基和三苯基锡烷基)-2,5-降冰片二烯,以及内基-5-(三甲基锡烷基)-
Synthesis and use of 7-substituted norbornadienes for the preparation of prostaglandins and prostanoids
作者:Anthony D. Baxter、Falmai Binns、Tariq Javed、Stanley M. Roberts、Peter Sadler、Feodor Scheinmann、Basil J. Wakefield、Marcus Lynch、Roger F. Newton
DOI:10.1039/p19860000889
日期:——
Syntheses of 7-substituted norbornadienes from 7-t-butoxy- and 7-halogeno-norbornadienes are described. Rearrangement of the products in the presence of peracetic acid gives bicyclic aldehydes (2) in equilibrium with enol ethers (3) which are hydrolysed to hydroxycyclopentenylacetaldehydes (4), and converted into key intermediates for the synthesis of prostaglandins and their analogues. Syntheses of
Rearrangements of free radicals x : C7H7 - radicals and related systems
作者:Dieter Brandes、Fritz Lange、Reiner Sustmann
DOI:10.1016/s0040-4039(00)71185-3
日期:1980.1
7-Norbornadienyl radicalrearranges in matrix to tropylium radical. Deuterated and cyano substituted bicyclo(3.2.0)heptadienyl radicals do not undergo 1.2-vinyl shifts prior to electrocyclic ring opening.
CATALYST COMPOSITION FOR PREPARING ELASTIC COPOLYMER, AND METHOD FOR PREPARING ELASTIC COPOLYMER, WHICH COMPRISES ETHYLENE AND ALPHA-OLEFIN OR ETHYLENE, ALPHA-OLEFIN AND UNCONJUGATED DIENE, BY USING SAME
申请人:KUMHO POLYCHEM CO., LTD.
公开号:US20200270382A1
公开(公告)日:2020-08-27
The present invention relates to a method for preparing an ethylene-based elastic copolymer, and more particularly, to a method for preparing an ethylene-based elastic copolymer by using a catalyst composition for preparing an ethylene-based elastic copolymer, the catalyst composition comprising a binuclear constrained geometry transition metal compound, as a main catalyst, having a structural advantage to obtain a high-molecular-weight ethylene-based elastic copolymer due to a high polymerization activity and comonomer reactivity because the binuclear constrained geometry transition metal compound has a structure in which cyclopentadiene ligands of two constrained geometry catalysts are linked by 1,4-phenylene, and one or more cocatalyst compounds selected from the group consisting of an organoaluminum compound, an organoaluminoxane compound, and a boron compound.
Diadducts from methyl diazoacetate and norbornadiene
作者:S.C. Clarke、B.L. Johnson
DOI:10.1016/s0040-4020(01)88417-9
日期:1968.1
to the two isomeric diadducts arising from reaction of norbornadiene and methyl diazoacetate have been reinvestigated. The results are interpreted to indicate that the two isomers have unrearranged, tetracyclo[3.3.1.02,4.06,8]nonane, structures IX and XVIII and do not undergo facile thermal valence isomerization to tetracyclo[3.3.1.02,8.04,6]nonanes.