Water will suppress methyl radical or carbocation reactions by allowing for the protonation of these materials and preventing them from further reacting with other materials.
4 R-40 + 3 R-134a + [Al.sub.solid] = 3 R133a + Al[F.sub.4.sup.-] + 4 C[H.sub.3] + carbocation (2)
He began to investigate these steps more formally about six years ago, eventually unravelling the details of carbocation
Its biosynthesis involves the reaction of 3-methyl-2-buten-1-ol pyrophosphate (7) to generate a transient allylic cation intermediate (8), which rapidly reacts with the electron-rich 3-methyl-3-buene-1-ol pyrophosphate (9) to form a carbon-carbon chemical bond and a second carbocation
deamination (to form carbocations
) of compounds such as
"Olah's discovery completely transformed the scientific study of the elusive carbocations
," the Royal Swedish Academy of Sciences stated in announcing the award.
McClelland's research has run the gambit from physical organic chemistry, where his group pioneered the direct study of reactive intermediates of the tetrahedral intermediate and carbocation
class, to biological and medicinal organic chemistry, where his group examined the properties of several important classes of drugs.
in organic synthesis.--Deamination
This research group (with Alan Hopkinson) is also actively investigating destabilized carbocations
. These ions may be generated and studied at low-temperature but undergo characteristic reactions at higher temperatures often involving hydride abstraction and functionalization at proximal unactivated C-H bonds.
His most recent efforts have been directed towards solid-state NMR and x-ray crystallographic studies of isolable carbocations
, the thermal and photochemistry of iminium salts related to the visual pigments, and the use of photochemical methods for the fabrication of charge-mosaic piezodialysis membranes.
eq 18 probably via the formation of incipient carbocations
. Most interestingly, methyl propiolate and 2,3-dimethyl-2-butene condense in the metals' coordination spheres to form cationic lactone-containing species in the manner depicted in eq 20, ie.
They believed this was possible because carbon, a close relative on the periodic table, can form a "carbocation
," which also has three bonds and a positive charge.