作者:Heindirk tom Dieck、Ingo Kleinwächter、Erhard T.K. Haupt
DOI:10.1016/0022-328x(87)85043-x
日期:1987.3
Displacement of piperidine from Ru(COD)(piperidine)-trans-(H)Cl (I) by 1,4-diaza-1,3-dienes (DAD: RNCR′CR′NR) gives the complexes cis-Ru(COD)(DAD)-(H)Cl (III). With relatively bulky DAD ligands the complexesIII are unstable and are converted into compounds IV, which are also formed fromIII on heating. ComplexesIII are not accessible from Ru(COD)(DAD)Cl2(V). If the analogous starting material involving
1,4-二氮杂-1,3-二烯(DAD:RNCR'CR'NR)从Ru(COD)(哌啶)-反式(H)Cl(I)取代哌啶得到配合物顺式- Ru(COD)(DAD)-(H)Cl(III)。在具有相对大体积的DAD配体的情况下,配合物III不稳定并转化为化合物IV,其在加热时也由III形成。从Ru(COD)(DAD)Cl 2(V)无法获得络合物III 。如果使用涉及环庚三烯Ib代替COD配体的类似起始原料,则保留哌啶阴离子作为配体而不是氢化物。在室温下1刚性不对称III的1 H NMR光谱可以分别看到COD配体的所有12个氢原子。已通过使用2D-H / H相关光谱进行了完整分配。最高的场共振(1.2 ppm)归属于被DAD螯合物屏蔽的烯烃H原子。配合物III催化末端烯烃异构化为顺式/反式混合物()的内部烯烃。在1-烯烃的催化氢化硅烷化过程中,这种异构化是竞争性副反应。III的热分解得到游离的1,3-COD;
SO<sub>2</sub> conversion to sulfones: development and mechanistic insights of a sulfonylative Hiyama cross-coupling
作者:Aurélien Adenot、Joëlle Char、Niklas von Wolff、Guillaume Lefèvre、Lucile Anthore-Dalion、Thibault Cantat
DOI:10.1039/c9cc06858a
日期:——
A Pd-catalyzed Hiyama cross-coupling reaction using SO2 is described.
一种使用二氧化硫的Pd催化Hiyama交叉偶联反应被描述。
Bis(acetylacetonato)Ni(II)/NaBHEt3-catalyzed hydrosilylation of 1,3-dienes, alkenes and alkynes
5-heptanedionato)nickel(II) (1c) as versatile hydrosilylation catalyst precursors is described. Complexes 1a-c catalyze 1,4-selectivehydrosilylation of 1,3-dienes in the presence of NaBHEt3 at ambient temperature. The reactions exhibit good regioselectivity to give the branched isomers as major products. The catalytic system also catalyzes hydrosilylation of alkenes including industriary important siloxy-
Regio- und stereoselektive hydrosilylierung von isopren mit rhodium(I)- und rhuthenium(II)-komplexen ungesättigter N-haltiger steuerliganden
作者:Monika Brockmann、Heindirk tom Dieck、Ingo Kleinwächter
DOI:10.1016/s0022-328x(00)99636-0
日期:1986.8
The catalysis of isoprene hydrosilylation with different silanes HSiR3″ (R″ = Et, Ome, OEt), in the presence of rhodium(I) or ruthenium(II) complexes with unsaturated N-containing controlling ligands as co-catalysts, occurs under mild conditions and gives with high selectivity (Z)-2-methyl-1-silyl-2-butenes (VI), 2-methyl-4-silyl-2-butenes (VIII), 2-methyl-4-silyl-1-butenes (IX) or the 3-methyl-4-silyl-1-butenes
用不同的硅烷氢化硅烷化异戊二烯的HSIR催化3 “(R”=的Et,青梅,OET),铑(I)或钌的存在下(Ⅱ)配合物与不饱和Ñ含控制配位体作为助催化剂,下发生温和的条件,并具有高选择性(Z)-2-甲基-1-甲硅烷基-2-丁烯(VI),2-甲基-4-甲硅烷基-2-丁烯(VIII),2-甲基-4-甲硅烷基-1 -丁烯(IX)或3-甲基-4-甲硅烷基-1-丁烯(X)。因此,通过改变金属和控制配体,可以将除末端sp 2 -C原子之外的5个Si异构体中的4个作为催化的主要产物(51-87%)。通过催化首次获得手性X。全1给出了化合物VIII–X的1 H NMR归属。
Dirhodium(II)/DPPM Catalyzed 1,2-Hydrosilylation of Conjugated Dienes with Tertiary Silanes
(bis(diphenylphosphanyl)methane) catalyzed regioselective 1,2-anti-Markovnikov hydrosilylation of conjugated dienes with various tertiary silanes gave homoallylic silanes in acetonitrile, which tolerate broad functional groups. Control experiments proved that no π-allyl transition metal intermediates were involved in this 1,2-anti-Markovnikov hydrosilylation. Dirhodium hydride species was observed in