- The role of neat substrates in phase-vanishing and tandem phase-vanishing reactions
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Phase-vanishing reactions are triphasic reactions, which involve a reagent, a liquid perfluoroalkane as a phase screen and a substrate. Aromatization, isomerization and halogenation of neat substrates under phase-vanishing conditions gave the expected products in good to excellent yields. In tandem single-phase-phase-vanishing reaction, two reactants, placed in the top phase, afforded the intermediate, which in a subsequent phase-vanishing reaction reacted with the reagent from the bottom phase to give the final product. The reaction worked well under solvent-free conditions on liquid substrates and intermediates. With solids, results were better if an additional solvent was employed.
- Windmon, Nicole,Dragojlovic, Veljko
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scheme or table
p. 6543 - 6546
(2009/04/06)
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- Towards the cis-bromination of double bonds
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The bromination of olefins yielding a trans-1,2-dibromo-product was studied. Reagents were proposed to brominate the double bonds of cis-olefins mildly and stereospecifically. Reagents delivering two bromine atoms to the same side of olefins through a cyclic six-membered transition state were studied.
- Carman,Derbyshire,Hansford,Kadirvelraj,Robinson
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p. 117 - 126
(2007/10/03)
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- PHASE TRANSITIONS IN BICYCLIC COMPOUNDS.
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The thermal properties of bicyclic and cyclic compounds obtained by DSC show that substituents such as the anhydride, nitrile, and carbonyl groups retain the polymorphic phase properties of the parent ring systems while groups such as the imide, methylimide, and carboxylic acid exclude the appearance of a disordered solid phase. The phase properties of chloro and hydroxyl derivatives investigated and more varied and depend on the position of these groups on the ring. The variety of compounds studied shows that hysteresis is a common occurrence in all of these ring systems.
- Weinstein,Leffler,Currie
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