MONOCARBAHEXABORANE(7),
Abstract
In the course of investigating the products of an electric discharge of l-methylpentaborane a material, CB5H7, was isolated which represents the first known one-carbon carborane. Rv (g.l.c.) = 0.65 (relative to B5H9, Rv = 1.00); vapor tension, 503 mm at 26C; mol. wt. (gas density), 74.4, calc. 73.0. The (11)B n.m.r. of the pure compound displays three sets of doublets (delta = +19.1, J = 184 c.p.s.; delta = +9.7; J = 162 c.p.s. Boron trifluoride was used for the external standard. Delta = -2.5, J = 174 c.p.s.) with an area ratio of 2:2:1, respectively, which together with the molecular weight data, clearly indicates the presence of five borons. Additionally, the coupling constants for the observed doublets signify the attachment of one terminal hydrogen to each boron. The infrared spectrum exhibits a medium intensity, C-H (2960/cm), strong B-H (2640/cm) and medium B-H-bridge-B symmetric (2167/cm) stretching frequencies. However, a maximum of one bridge hydrogen and one hydrogen bonded to carbon is evident from a (1)H n.m.r. area analysis. The above evidence requires a molecular formula of CB5H7. An octahedral structure is proposed. (Extracted)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1965
- Accession Number
- AD0614601
Entities
People
- Gary B. Dunks
- Rogers P. Drake
- Thomas Onak
Organizations
- California State University, Los Angeles