Accession Number:

AD0614601

Title:

MONOCARBAHEXABORANE(7),

Descriptive Note:

Corporate Author:

CALIFORNIA STATE COLL LOS ANGELES

Report Date:

1965-05-01

Pagination or Media Count:

5.0

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 11B 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 221, 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 2960cm, strong B-H 2640cm and medium B-H-bridge-B symmetric 2167cm stretching frequencies. However, a maximum of one bridge hydrogen and one hydrogen bonded to carbon is evident from a 1H n.m.r. area analysis. The above evidence requires a molecular formula of CB5H7. An octahedral structure is proposed. Extracted

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE