Asymmetric catalysis. Part 127:Enantioselective desymmetrization of 2-n-butyl-4,7-dihydro-1,3-dioxepin with (η6-arene)ruthenium(II) half-sandwich complexes
摘要:
(eta(6)-Arene)ruthenium half-sandwich complexes are highly active and stereoselective catalysts in the enantioselective desymmetrization of 2-n-butyl-4,7-dihydro-1,3-dioxepin to give 2-n-butyl-4,5-dihydro-1,3-dioxepin. Enantioselectivities up to 61% ee were achieved. The temperature and solvent dependence of the catalysis as well as the activation of the catalyst were investigated. (C) 1998 Elsevier Science Ltd. All rights reserved.
Homolytic addition of polyhaloalkanes to ?-vinyloxy-?-trialkylstannoxy-alkanes as a new route to 2-perhaloalkylmethyl-substituted 1,3-dioxacyclanes
作者:P. V. Arbuzov、M. G. Voronkov、R. G. Mirskov、V. K. Stankevich、B. F. Kukharev、G. R. Klimenko、V. I. Rakhlin
DOI:10.1007/bf01151306
日期:1995.9
Photoinduced reactions of α-vinyloxy-ω-trialkylstannoxyalkanes, CH2=CHO(CH2)nOSnEt3 (n = 2 to 4), with polyhaloalkanes result in 2-perhaloalkylmethyl-substituted 1,3-dioxacyclanes.
A golf ball having at least a core and a layer disposed about the core is disclosed. The layer is formed from a composition having multiple reactive and/or non-reactive ingredients. At least one of these ingredients is a polyether polyahl formed from three or more diols and/or cyclic ethers, such as oxolane, oxirane, and a chiral cyclic ether.