Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published March 1991 | Supplemental Material
Journal Article Open

Reactivity of permethylscandocene derivatives with acetylene. Structure of acetylenediylbis(permethylscandocene), (η^5-C_5Me_5)_2Sc-C≡C-Sc(η^5-C_5Me_5)_2

Abstract

Excess acetylene reacts with Cp*_2Sc-R (Cp* = η-C5Me_5; R = H, alkyl, aryl, alkenyl, alkynyl, amide) below -78 °C to yield R-H and Cp*_2Sc-C≡CH; the latter then reacts with excess C_2H_2 to form polyacetylene. Cp*_2Sc-C≡CH cleanly decomposes to Cp*_2Sc-C≡C-ScCp*_2, most likely via u bond metathesis involving the Sc-acetylide and terminal C-H bonds for two molecules of Cp*_2Sc-C≡CH. The structure of this unusual acetylenediyl-bridged dimer has been determined by X-ray diffraction methods. It crystallizes with a half-molecule of toluene per scandium dimer in the tetragonal system, space group P42_1c (No. 114), with a = 15.057 (3) Å, c = 18.617 (6) Å, V = 4220.7 (18) Å^3, and z = 4.

Additional Information

© 1991 American Chemical Society. Received June 27, 1990. This work was supported by the USDOE Office of Energy Research, Office of Basic Energy Science (Grant No. DE-FG03-85ER13431), and by Shell Companies Foundation, which are gratefully acknowledged. We thank the NSF (Grant No. CHE-8219039) for funds to purchase the X-ray diffractometer.

Attached Files

Supplemental Material - om00049a001_si_001.pdf

Files

om00049a001_si_001.pdf
Files (2.1 MB)
Name Size Download all
md5:a3d60a71022c3c018527e1abf5cef7d3
2.1 MB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023