GAS PHASE HYDROBORATION OF ALLENE, OTHER OLEFINS, AND ACETYLENES.

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Abstract:

The gas phase hydroboration of simple mono-olefins is shown to be a general method for the synthesis of mono- and 1,1-di-alkyldiboranes in yields of 55-65 and 30-40, respectively, when carried out at 60-65 C using a 51 diborane olefin molar ratio. Terminal addition of diborane to allene results in the formation of the cyclic 1,2-trimethylene diborane. Polymerization of this compound, which takes place rapidly in liquid phase, is probably due to release of ring strain. Poly-mu-trimethylene- diborane is observed to depolymerize quantitatively at 60 C, thus establishing the reversibility of the reaction, which probably proceeds via mobile hydrogen bridges. Nonvolatile organoboron polymers, the structure of which is discussed in the case of 2-butyne, are formed nearly quantitatively by gas phase hydroboration of acetylenes with excess diborane in addition, small fractions of alkyldi boranes are isolated. Author

Author(s):
Lindner, Hans Hasso ; Onak, Thomas P.
Author Organization(s):
CALIFORNIA STATE COLL LOS ANGELES DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.,
Annotation:
Gas phase hydroboration of allene, other olefins, and acetylenes.
Pagination:
0028

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-9
Contract/Grant Number(s):
Nonr336400
Project Number(s):
NR052 427
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*ORGANOBORANES, SYNTHESIS(CHEMISTRY), BOROHYDRIDES, HYDROCARBONS, ALKENES, POLYMERS, GASES, INFRARED SPECTRA
Keyword(s):
*ACETYLENES, ACETYLENE, ALLENE, BUTADIENE, CROTONYLENE, HYDROBORATION, *OLEFINS, PROPYLENE, PROPYNE
Report Date:
1965 Sep 01