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Now showing items 1-8 of 8
DEGENERATIVE TRANSFER LIVING ZIEGLER-NATTA POLYMERIZATION OF α-OLEFINS
(2005-12-04)
A degenerative transfer (DT) living Ziegler-Natta polymerization system based on the cyclopentadienyl amidinate zirconium complex, (h5-C5Me5)ZrMe2[N(t-Bu)C(Me)N(Et)] (19), has been studied in detail. Compound 19 is an ...
EMPLOYING A REMOTE CONFORMATIONAL BIAS, INHIBITION OF GAMMA-BUTYROLACTONE FORMATION, AND A SODIUM TEMPLATE TO ENHANCE MACROCYCLIZATION IN CARBENE ADDITION REACTIONS
(2005-09-19)
Ring closure via dirhodium(II) catalyzed diazo decomposition of diazoacetates is an efficient method of asymmetric macrocycle formation, affording up to 28-membered rings without the high dilution requirement of many other ...
Synthetic Approaches to the Anticancer Agent Streptonigrin
(2005-09-23)
Pd-catalyzed coupling reactions have a central place in synthetic chemistry. In particular, studies from the DeShong laboratory have demonstrated that aryltrialkoxysilanes, in the presence of Pd(0) and fluoride, are capable ...
EFFORTS TOWARD (+)-7-DEOXYPANCRATISTATIN FEATURING A PALLADIUM CATALYZED ALLYLIC ARYLATION
(2005-01-21)
The synthesis of pancratistatin, 7-deoxypancratistatin, and its analogs have attracted the interest of synthetic chemists due to both their structural complexity as well as interesting biological activity. Although previous ...
N-METHYL-4-PICOLINIUM ESTERS AS PHOTOREMOVABLE PROTECTING GROUPS BASED ON PHOTOINDUCED ELECTRON TRANSFER
(2005-05-03)
The goal of this project is to develop an improved photoremovable protecting group (PRPG) for the carboxylate functionality that can be released using high wavelength light through a photoinduced electron transfer (PET) ...
Cucurbit[n]uril Analogues
(2005-11-22)
Molecular recognition and self-assembly in aqueous solution have experienced rapid growth in recent years. The use of alpha-, beta-, and gamma-cyclodextrins, calixarenes, and cyclophanes have served as the platforms for ...
PHOTOLYTIC GENERATION OF NITRENIUM IONS: KINETIC STUDIES AND POLYMERIZATION REACTIONS
(2005-11-29)
Nitrenium ions are highly reactive transient species that contain a positively charged and dicoordinate nitrogen atom. The nitrogen atom contains only six electrons in its valence shell and thus the nitrogen is electron ...
DEVELOPMENT OF ARYL SILOXANE CROSS-COUPLING TECHNOLOGY AND ITS APPLICATION TO THE SYNTHESIS OF COLCHICINE AND ALLOCOLCHICINE DERIVATIVES
(2005-09-27)
One of the most versatile methods for the formation of aryl-aryl bonds is the palladium-catalyzed cross-coupling reaction. Previous work in the DeShong laboratory has demonstrated the utility of aryl siloxanes for the ...