Silylation as a protective method for terminal alkynes in oxidative couplings
作者:R. Eastmond、T.R. Johnson、D.R.M. Walton
DOI:10.1016/0040-4020(72)80041-3
日期:1972.1
been prepared in solution by sequences involving Cu-catalysed oxidative couplings (Hay technique) of silyl-protected terminal alkynes, partial cleavage (desilylation) of the products by alkali, recoupling and complete desilylation. Thus using the conditions established in a model coupling, Et3SiCCH(I) → Et3Si(CSiEt3(II), coupling of the silyidiyne Et3Si(CC)2H(II) gives Et3Si(CC)4SiEt3(IV) which upon
Wavelength dependence of polyyne preparation by liquid-phase laser ablation using pellet targets
作者:Ryutaro Matsutani、Kohei Inoue、Noriyuki Wada、Kazuo Kojima
DOI:10.1039/c1cc00102g
日期:——
The amount of polyynes produced by Nd:YAG laser (355, 532, and 1064 nm) ablation of fullerene and graphite pellet targets was the largest for 1064 nm ablation, contrary to the powder target in the previous report. This result is believed to come from the difference in the main polyyne-production area in liquids in the optical cell, depending on the pellet and powder targets.
Cook et al., Journal of the Chemical Society, 1952, p. 2883,2889
作者:Cook et al.
DOI:——
日期:——
Submerged electric arc between graphite electrodes: a one-pot tool for the synthesis of long-chain polyynes in solution
作者:Franco Cataldo
DOI:10.1016/j.tetlet.2003.10.100
日期:2004.1
Polyynes, a class of molecules described by the general formula H-(CdropC)(m)H (where m is an integer) can be synthesized using an electric arc between graphite electrodes submerged in an organic solvent such as methanol, n-hexane, n-dodecane, decahydronaphthalene or acetonitrile. When the electric are is used in acetonitrile at -40degreesC, polyyne chains of up to 18 carbon atoms (m = 9) have been produced together with monocyanopolyyne as by-product. The polyynes can be reduced to ene-ynes by shaking a hexane solution of them with Zn/HCl. (C) 2003 Elsevier Ltd. All rights reserved.
The simplest approach to prepare solutions of polyynes in hydrocarbons
作者:Franco Cataldo
DOI:10.1016/j.tetlet.2005.03.160
日期:2005.5
Polyynes solutions having as main components C6H2 and C8H2 can be prepared in hydrocarbon solvents by hydrolyzing calcium carbide in an NH4Cl aqueous solution containing Cu(I)/Cu(II) salts. The polyynes are released into a hydrocarbon solvent by acidification with coned. HCl. Heptane solutions with polyynes concentration as high as 0.1 M can be easily prepared. (c) 2005 Elsevier Ltd. All rights reserved.