The reactions of tetramethyldiborane with ammonia and trimethylamine

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dc.contributor.advisorCampbell, George W.
dc.contributor.committeeMemberGray, Dean O.
dc.contributor.committeeMemberDrake, G. Wilson
dc.contributor.committeeMemberMcElrath, Eby N.
dc.creatorMartincheck, Louis Andrew
dc.date.accessioned2022-06-22T19:53:42Z
dc.date.available2022-06-22T19:53:42Z
dc.date.issued1957
dc.description.abstractThe high vacuum technique was used to study the reactions of tetramethyldiborane with the Lewis bases ammonia and trimethylamine. These reactions have been confirmed to proceed at ambient temperatures as follows: Me[lowered 4]B[lowered 2]H[lowered 2] + 2NH[lowered 3] = 2H[lowered 2] + 2Me[lowered 2]BNH[lowered 2] Me[lowered 4]B[lowered 2]H[lowered 2] + 2Me[lowered 3]N = 2Me[lowered 2]BHNMe[lowered 3] The reaction of the diammoniate of tetramethyldirborane with trimethylamine displaces ammonia at -80[degrees] in amounts greater than one mole of ammonia per mole of the diammoniate. The First mole of ammonia is readily displaced and the remainder is slowly displaced with trimethylamine. The data indicates that the net stoichimetric reaction at room temperature for the displacement of one mole of ammonia is Me[lowered 4]B[lowered 2]H[lowered 2][dot]2NH[lowered 3] + NMe[lowered 3] = H[lowered 2] + Me[lowered 2]BNH[lowered 2] + Me[lowered 2]BHNMe[lowered 3] + NH[lowered 3] Comparisons are made for the structure of the diammoniate of tetramethyldiborane with the three proposed structures for the diammoniate of diborane. The results of the trimethylamine displacement studies are best correlated with the structure (Me[lowered 2]B(NH[lowered 3])[lowered 2]+)(H[lowered 2]BMe[lowered 2]-) which is comparable to that proposed by Parry and coworkers for the diammoniate of diborane. Two unsuccessful attempts to prepare aminotetramethyldiborane from the products of the tetramethyldiborane-ammonia system are discussed. The hydrolysis of the methyl derivatives of boric acid to produce methane is shown to be appreciable at temperatures above 110[degrees]. A vapor pressure-composition curve is given for the ammonia-trimethylamine system.
dc.description.departmentChemistry, Department of
dc.format.digitalOriginreformatted digital
dc.format.mimetypeapplication/pdf
dc.identifier.other13726359
dc.identifier.urihttps://hdl.handle.net/10657/9884
dc.language.isoen
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.titleThe reactions of tetramethyldiborane with ammonia and trimethylamine
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.departmentChemistry, Department of
thesis.degree.disciplineChemistry
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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