Accession Number:

ADA210728

Title:

Metal-Assisted Syntheses of Boranes and Carboranes

Descriptive Note:

Final rept. 14 Mar 1986-14 May 1989

Corporate Author:

VIRGINIA UNIV CHARLOTTESVILLE

Personal Author(s):

• Grimes, Russell N.

Report Date:

1989-06-30

Pagination or Media Count:

10.0

Abstract:

Methods were developed for i the systematic preparation of organosubstituted derivatives of small carboranes, especially of the type nido- RRC2B4H6 where R is alkyl, aryl, or arylalkyl groups ii oxidative fusion of these compounds to large R2C4B8H8 clusters via transition metal-promoted fusion iii conversion of the nido-carboranes to stable arenemetalcarborane complexes incorporating first-, second-, or third-row transition series metals iv stacking of the metal-carborane complexes to produce novel triple- and multi-decker sandwich complexes containing two or more metal centers v synthesis of B-substituted carboranes and metallacarboranes via controlled regiospecific pathways and vi studies of the chemical reactivity of the nido- carboranes and their derived metal complexes. The nonmetallated new carboranes are potentially useful in VHBR very high burning rate applications, while the metal sandwich complexes are precursors to high molecular weight polymers or solid state materials having novel electronic properties. Boranes Carboranes Metallacarboranes Metal-arene complexes Sandwich complexes Multidecker complexes.

Descriptors:

• *CARBORANES
• *BORANES
• *METAL COMPLEXES
• *SYNTHESIS(CHEMISTRY)
• MOLECULAR WEIGHT
• REACTIVITIES
• ORGANOMETALLIC COMPOUNDS
• SOLIDS
• CHEMICAL REACTIONS
• ARYL RADICALS
• AROMATIC COMPOUNDS
• TRANSITION METAL COMPOUNDS
• BURNING RATE
• ALKYL RADICALS
• SANDWICH CONSTRUCTION
• SUBSTITUTION REACTIONS
• POLYMERS
• PREPARATION
• HIGH RATE
• ELECTRONICS
• METALS

Subject Categories:

• Industrial Chemistry and Chemical Processing
• Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE