Cross-Dehydrocoupling of SiH/NH and Heterofunctionalization Reactions Mediated by Alkali, AlkalineEarth and Early Transition Metal Complexes

Anga, Srinivas and Panda, Tarun K (2016) Cross-Dehydrocoupling of SiH/NH and Heterofunctionalization Reactions Mediated by Alkali, AlkalineEarth and Early Transition Metal Complexes. PhD thesis, Indian institute of technology Hyderabad.

Text
Thesis_Phd_CY_5201.pdf
Restricted to Repository staff only until May 2021.
Download (5MB) | Request a copy

Abstract

Finding molecules which are able to catalyse the reaction between others is an important contribution of molecular chemists to increase the efficiency of chemical reactions. The atom economical reactions or approaches have provided significant challenge to the communities of organometallic chemists and synthetic organic chemists. The term atom economy is conversion efficiency of a reaction process in terms of all atoms involved. In an ideal chemical process the amount of staring materials are equal to the amount of products generated and no atom is wasted. Recent developments like high raw material cost and increased sensitivity to environmental concerns have made atom economical approaches more popular. Chemistry of alkaline-earth metals are less developed and they are often termed as “sleeping beauties” compared to magnesium chemistry. Among the alkaline-earth metals (Mg, Ca, Sr and Ba), magnesium being exceptional which was extensively studied by Grignard, who established the organomagnesium reagent plays a significant role in the synthetic organic and inorganic chemistry. In the recent years, the chemistry of heavier alkaline-earth metals was wellestablished and complexes of the alkaline-earth metals were employed in various catalytic applications such as ring-opening polymerization of various cyclic esters, polymerization of styrene and dienes, and also atom economical reaction, cross-dehydrocoupling of silanes and amines, Hydroelementation (such as hydroamination, hydrophosphination, hydrosilylation and hydroboration) reactions of alkenes and alkynes. In my thesis work, I have mainly focused on the syntheses and structural characterization of well-defined homo- and heteroleptic alkaline-earth and early transition (group IV) metal complexes supported by novel bulky bis-iminopyrrolyl, phosphinanilido-imine chalcogenides, boranes and 1,4-diaza1,3-butadiene (DAD) ligands in their coordination sphere as multi-dentate chelating ligands. All newly prepared heteroleptic metal complexes were used as active precatalysts in atom economical reactions such as cross-dehydrocoupling of silanes with amine and hydroelementation (hydroamination, hydrophosphination and hydrosilylation) reactions.

[error in script]

IITH Creators: