The manifestation of non-bonded attraction in the physical properties of cis and trans olefins
作者:N.D. Epiotis、S. Shaik、J.R. Larson、F. Bernardi
DOI:10.1016/0040-4020(77)80149-x
日期:1977.1
Non-bondedattraction is suggested to account for a host of differences in the physical properties of cis and trans olefins of the type XHCCHX. The main predictions are: (i) The cis isomer is more stable than the trans isomer; (ii) The CC bond is longer and the C-X bonds are shorter for the cis isomer; (iii) The π MO's orbital energies of the two isomers differ such that the trans isomer is a better
On the reaction of (dibromomethyl)lithium with bicyclic and tricyclic ketones
作者:David S. Teager、Harry D. Ward、Roger K. Murray
DOI:10.1021/jo00072a037
日期:1993.9
Many literature examples show that the reaction of a simple cyclic ketone with (dibromomethyl)-lithium at -78-degrees-C followed by low-temperature hydrolysis of the resulting lithium alkoxide 33, gives the corresponding dibromomethyl alcohol. We have found that the reaction of a bicyclic or tricyclic ketone with (dibromomethyl)lithium under comparable conditions provides a dibromomethyl alcohol and/or an alpha-bromo aldehyde. The latter product appears to result from an intramolecular displacement reaction in 33 to give a bromo epoxide, which then rearranges stereospecifically to the alpha-bromo aldehyde. The product ratios obtained in all of these reactions seem to be determined by the steric interactions in 33 between the alkoxide and dibromomethyl groups and the hydrogens that are syn to them at the carbons which are beta to the original carbonyl carbon. As these steric interactions increase, the proportion of alpha-bromo aldehyde in the product mixture increases. If 33 obtained from any cyclic ketone is warmed to 10-degrees-C before it is hydrolyzed, then the only product isolated is the alpha-bromo aldehyde
Bishop, Roger; Lee, Gum-Hee, Australian Journal of Chemistry, 1987, vol. 40, # 2, p. 249 - 255
作者:Bishop, Roger、Lee, Gum-Hee
DOI:——
日期:——
Gevorkyan, G. G.; Ordubadi, M. D.; Pekhk, T. I., Journal of Organic Chemistry USSR (English Translation), 1989, vol. 25, # 7.1, p. 1280 - 1286
作者:Gevorkyan, G. G.、Ordubadi, M. D.、Pekhk, T. I.、Belikova, N. A.
DOI:——
日期:——
Synthesis and chemistry of 2,8-disubstituted noradamantanes