Conversion of 2-alkenylcyclopropylcarbene-chromium complexes to 5-alkenyl-2-cyclopentenones: A stereospecific three- to five-carbon ring expansion reaction
作者:James W. Herndon、David K. Hill、Leonard A. McMullen
DOI:10.1016/0040-4039(95)01124-z
日期:1995.8
Upon thermolysis, 2-alkenylcyclopropylcarbene-chromium complexes are converted to 5-alkenyl-2-cyclopentenones. The reaction appears to proceed with retention of configuration in the absence of stericfactors.
Synthesis and1H-,13C-, and57Fe-NMR spectra of mono- and bis[tricarbonyl(?4-diene)iron], and (?3-allyl)tetracarbonyliron trifluoroborate complexes
作者:Christoph M. Adams、Giovanni Cerioni、Andreas Hafner、Hermann Kalchhauser、Wolfgang von Philipsborn、Roland Prewo、Andreas Schwenk
DOI:10.1002/hlca.19880710526
日期:1988.8.10
with a (Z)-configuration terminal Me group show steric inhibition of metal complexation resulting in lower yields and formation of tetracarbonyl(η2-diene) and tricarbonyl(η4-heterodiene) complexes as additional products. Regioselective attack by C-nucleophiles at the carbonyl C-atoms of the functional group with or without concomitant 1,3 mogration of the Fe(CO)3 group was used to synthesize polyenes and
Stannyldienes, new tools for organic synthesis. preparatiom and reactivity
作者:Cristina Nativi、Maurizio Taddei、André Mann
DOI:10.1016/0040-4020(89)80022-5
日期:1989.1
for a regiocontrolled transfer of the dienic structure by : a)tin-lithium exchange and further reaction with aldehydes to give conjugated dienic alcohols; b)coupling with acyl chlorides in the presence of palladiumcatalysts to give conjugated dienic ketones; c) AlCl3, promoted reaction with acyl chlorides to give allenic ketones.
作者:Masafumi Hirano、Ayumi Kuramochi、Keita Shimada、Nobuyuki Komine、Sayori Kiyota、Stephen A. Westcott
DOI:10.1039/c9cc05930j
日期:——
A series of borylated conjugated trienes and skipped dienes is prepared by Ru-catalysed cross-dimerisation using alkynyl-, dienyl-, and vinyl boronates.
A Series of Crystallographically Characterized Linear and Branched σ-Alkane Complexes of Rhodium: From Propane to 3-Methylpentane
作者:Alexander J. Bukvic、Arron L. Burnage、Graham J. Tizzard、Antonio J. Martínez-Martínez、Alasdair I. McKay、Nicholas H. Rees、Bengt E. Tegner、Tobias Krämer、Heather Fish、Mark R. Warren、Simon J. Coles、Stuart A. Macgregor、Andrew S. Weller
DOI:10.1021/jacs.1c00738
日期:2021.4.7
(3-methylpentane). For the linear alkanes propane and hexane, some additional Rh(I)···H–C interactions with the geminal C–H bonds are also evident. The stability of these complexes with respect to alkane loss in the solid state varies with the identity of the alkane: from propane that decomposes rapidly at 295 K to 2-methylbutane that is stable and instead undergoes an acceptorlessdehydrogenation to form a bound alkene
利用固态分子有机金属(SMOM)技术,特别是固/气单晶到单晶的反应性,一系列通式为[Rh(Cy 2 PCH 2 CH 2 PCy 2 )(η已经制备了n :η (间烷)][BAr F 4 ](烷烃=丙烷、2-甲基丁烷、己烷、3-甲基戊烷;Ar F =3,5-(CF 3 ) 2 C 6 H 3 )。这些新配合物已使用单晶 X 射线衍射、固态核磁共振波谱和 DFT 计算技术进行了表征,并在金属配位位点呈现出多种 Rh(I)·H–C 结合基序:1,2- η 2 :η 2 (2-甲基丁烷)、1,3-η 2 :η 2 (丙烷)、2,4-η 2 :η 2 (己烷)和1,4-η 1 :η 2 (3-甲基戊烷)。对于直链烷烃丙烷和己烷,一些额外的 Rh(I)…H-C 与偕 C-H 键的相互作用也很明显。这些络合物相对于固态烷烃损失的稳定性随烷烃的特性而变化:从在 295 K 下快速分解的丙烷到稳定的 2-