Cyclopropenation of internal alkynylsilanes and diazoacetates catalyzed by copper(<scp>i</scp>) N-heterocyclic carbene complexes
作者:Thomas J. Thomas、Benjamin A. Merritt、Betsegaw E. Lemma、Adina M. McKoy、Tri Nguyen、Andrew K. Swenson、Jeffrey L. Mills、Michael G. Coleman
DOI:10.1039/c5ob02259b
日期:——
Copper(I) N-heterocycliccarbene (CuNHC) complexes are more catalytically active than traditional transition metal salts for the cyclopropenation of internal alkynylsilanes and diazoacetate compounds. A series of 1,2,3-trisubstituted and 1,2,3,3-tetrasubstituted cyclopropenylsilane compounds were isolated in good overall yields. An interesting regioselective and chemodivergent reaction pathway was
A Free-Radical-Promoted Stereospecific Decarboxylative Silylation of α,β-Unsaturated Acids with Silanes
作者:Lizhi Zhang、Zhaojia Hang、Zhong-Quan Liu
DOI:10.1002/anie.201509537
日期:2016.1.4
acrylic and propiolic acids with silanes was developed. This reaction represents the first example of decarboxylative CSi bond formation and provides an efficient and convenient approach to various synthetically useful alkenyl and alkynyl organosilicon compounds through the reaction of α,β‐unsaturated acids with silanes. Spin‐trapping and EPR experiments support a radicaladdition/elimination process
Tuning the Selectivity of AuPd Nanoalloys towards Selective Dehydrogenative Alkyne Silylation
作者:Maren Wissing、Armido Studer
DOI:10.1002/chem.201900493
日期:2019.4.23
The cross‐dehydrogenativecoupling of terminal alkynes and hydrosilanes catalyzed by AuPd nanoalloys is described. Metal nanoparticles are readily prepared in 15 minutes from commercially available and cheap starting materials by using a photochemical approach. The ratio of Au and Pd in the alloys heavily influences their reactivity. These cooperative nanoalloy catalysts tolerate a large number of
The bromination, debromination and debromosilylation of silylstyrenes and other vinylsilanes
作者:A.G. Brook、J.M. Duff、W.F. Reynolds
DOI:10.1016/s0022-328x(00)85083-4
日期:1976.11
trans-triphenylsilylstyrene, it is shown that bromination and debromination of silylstyrenes occur with syn stereochemistry, and that debromosilylation occurs with anti stereochemistry in polar solvents. Differentstereochemistries may prevail with other vinylsilanes. Other elimination and substitution reactions are also described.