state, 2 forms a Br‐bridged dimer with a pseudo C2‐symmetric and twisted AlC8 nine‐membered ring. Deuterium‐labeling experiments and DFT calculations on the reaction of 1 with 3‐hexyne suggested that 1‐bromo‐1‐alumacyclohepta‐2,4,6‐triene, which is formed by the insertion of one molecule of 1‐hexyne into the AlC bond of alumole 1, is the key intermediate for the generation of 2 as well as hexaethylbenzene
Churchill, Melvyn Rowen; Ziller, Joseph W.; Freudenberger, John H., Organometallics, 1984, vol. 3, # 10, p. 1554 - 1562
作者:Churchill, Melvyn Rowen、Ziller, Joseph W.、Freudenberger, John H.、Schrock, Richard R.
DOI:——
日期:——
Generation of Masked Ti<sup>II</sup> Intermediates from Ti<sup>IV</sup> Amides via β-H Abstraction or Alkyne Deprotonation: An Example of Ti-Catalyzed Nitrene-Coupled Transfer Hydrogenation
作者:Adam J. Pearce、Yukun Cheng、Rachel J. Dunscomb、Ian A. Tonks
DOI:10.1021/acs.organomet.0c00577
日期:2020.11.9
Simple Ti amide complexes are shown to act as sources for masked Ti-II intermediates via several pathways, as demonstrated through the investigation of a unique Ti-catalyzed nitrene-coupled transfer hydrogenation of 3-hexyne. This reaction proceeds through reduction of azobenzene by a masked Ti-II catalyst, wherein both amines and 3-hexyne can serve as the hydrogen source/reductant for Ti by forming putative titanaziridines via beta-H abstraction or putative titanacyclopentynes via protonolysis, respectively.
Metathesis of acetylenes by (fluoroalkoxy)tungstenacyclobutadiene complexes and the crystal structure of W(C3Et3)[OCH(CF3)2]3. A higher order mechanism for acetylene metathesis
作者:John H. Freudenberger、Richard R. Schrock、Melvyn Rowen Churchill、Arnold L. Rheingold、Joseph W. Ziller