Subject nitrogen hydrides

It has been established that under intense milling in a planetary mill in a nitrogen atmosphere, titanium hydride may decompose with formation of defected structure characterized by partly non-occupied tetrahedron voids in a face-centered cubic sublattice of titanium atoms. This effect is accompanied by decrease in the crystal lattice parameter of titanium hydride subjected to intense milling for 60 min. 

This article covers only a part of the chemistry of boron. Boron-carbon compounds are covered in other articles in this volume see Boron Organoboranes Boron Metallacarbaboranes, and Boron Polyhedral Carboranes). The main subject of the latter two articles, and the separate one on Boron Hydrides is the extensive chemistry of the multicenter bonded boron-hydride systems. This area has been a major focus of boron research for the past 60 years. There is some direct overlap between the two articles Borides Solid-state Chemistry and Borates Solid-state Chemistry, and this more general one covering the inorganic chemistry of boron. Boron-Nitrogen Compounds are also covered separately. These articles should be consulted for more detailed discussions of the structure, bonding, and properties of borides, solid-state borates, and boron-nitrogen compounds. 

A radical cascade reaction has been accompHshed by StaHnski and coworkers which converts dipeptide derivatives to nitrogen-containing heterocycles (Scheme 6) [9]. In this work, N-bromobenzyl-hf-propargyl-substituted dipeptides such as 10 were subjected to Stork s catalytic procedure with tributyltin hydride [10]. An aryl radical is formed followed by a 1,5-hydrogen shift, generating the a-centered carbon radical 11. 5-Fxo-dig radical cyclization... 

The silanes have been used as intermediates (e.g., R2M-TMS), in the conversion of metalloid halides R2MHal to their hydrides RjMH, which are then subjected to cyclization. They have also been used as leaving groups on heteroatoms such as nitrogen in their reactions with metalloid halides to give compounds such as the amides (107). 

---