A comparison of hydrogen bonding solvent effects on the singlet oxygen reactions of allyl and vinyl sulfides, sulfoxides, and sulfones
作者:Kristina L. Stensaas、Brent V. McCarty、Natacha M. Touchette、James B. Brock
DOI:10.1016/j.tet.2006.08.084
日期:2006.11
in the following deuterated solvents: acetonitrile, benzene, chloroform, methanol, or methanol/water mixture. In each case the ene allylic hydroperoxide products and/or the [2+2] cycloaddition products were quantified and inspected for possible hydrogen bonding induced differences in product selectivity and regiochemistry. After comparison to literature values for related substrates, the results indicate
The enereaction of N-Phenyl-1,2,4-triazoline-3,5-dione with alkenes shows a remarkable preference for hydrogen abstraction from the group which is geminal to the larger substituent of the double bond. These results require that the dominant effect in the transition state of the enereaction is the nonbonded interactions.
Stereoselective preparation of vinyl sulfones by protodesilylation of allyl silanes
作者:Raymond L. Funk、Joy Umstead-Daggett、Kay M. Brummond
DOI:10.1016/s0040-4039(00)60467-7
日期:1993.4
Allyl sulfones can be conjugated to furnish vinyl sulfones via allyl silane intermediates. The stereoselectivity observed in the protodesilylation step provides a new method for stereoselective preparation of (E)-di-and trisubstituted vinyl sulfones.