871-84-1Relevant articles and documents
Cyclic Diynes by Alkyne Metathesis
Hellbach, Bjoern,Gleiter, Rolf,Rominger, Frank
, p. 2535 - 2541 (2007/10/03)
The preparation of α,ω-diynes with methyl groups at the termini (11a-i) is described. The methylene groups between the alkyne units vary between n = 12 (a) and n = 4 (i). Ring closing metathesis with Mo(CO) 6/CF3C6H4OH yielded the monocyclic alkyne 12a with 11a as starting material, whereas 11b-g yielded the cyclic diynes 13b-g. Detailed structural parameters were obtained for 13b and 13c by X-ray crystallography.
Dehydrogenative silylation of terminal alkynes catalyzed by Ytterbium- imine complexes
Takaki, Ken,Kurioka, Masanobu,Kamata, Tohru,Takehira, Katsuomi,Makioka, Yoshikazu,Fujiwara, Yuzo
, p. 9265 - 9269 (2007/10/03)
Catalytic dehydrogenative silylation of terminal alkynes with hydrosilanes has been achieved by using divalent Yb-imine complexes. The reaction with mono-, di-, and trihydrosilanes gave the corresponding alkynylsilanes in good yields. α,ω-Diynes were similarly silylated at both termini. Thus, oligomers were obtained from the diynes and dihydrosilanes. In addition, it has been found that the imine complexes exhibit catalytic activity for redistribution of the silyl groups of the alkynylsilanes and for Si-Si bond fission of disilanes.