Hydride Derivatives Research Articles

Stereospecific polymerization of 1,3‐butadiene. I. New catalysts based on TiCl4, AlI3, and some aluminum hydride derivatives

AbstractSome ternary catalytic systems used in the polymerization of butadiene to a prevailingly 1,4‐cis product are described. They make use of some aluminum hydride derivatives, aluminum iodide, and titanium tetrachloride. For each catalytic system we have adopted conditions to obtain the maximum yield of polymer and the highest content of 1,4‐cis units. Such optimum conditions are achieved at certain molar ratios of aluminum hydrides/TiCl4 and AlI3/TiCl4. In particular, for a constant amount of AlI3 and TiCl4, the choice of the optimum ratio of hydride/TiCl4 depends on the quantity of active hydrogens present in the aluminum compounds while it does not depend on the type substituents, e.g., chloro, amino groups, etc. The presence of Lewis bases, which tend to stabilize some aluminum hydrides and make them soluble in the reaction medium, does not influence the course of polymerization provided such bases are present in stoichiometric amount with respect to the aluminum. If, however, these complexing agents are in excess, a decrease of the catalytic activity and 1,4‐cis content is noticed. This is more so, the stronger the basicity of the complexing Lewis base added. The results obtained in the polymerization of butadiene by means of numerous laboratory runs were confirmed by pilot‐plant runs.

728. A study of metal borohydrides. The reaction of aluminium borohydride with various ligand molecules

The reactions of aluminium borohydride with several Lewis bases, containing donor atoms from Groups V and VI, have been studied. All the bases react initially to form 1 : 1 adducts, and those containing nitrogen or phosphorus as the donor atom then react further until 4 equivalents of ligand have been consumed; the products are then derivatives of aluminium hydride, L+A1H3 (where L = ligand) and borane, L+BH,. The infrared and the proton and llB nuclear magnetic resonance (n.m.r.) spectra of the products have been recorded, and are discussed in relation to the structure of the adducts. In addition, a comparison of the behaviour of aluminium borohydride with that of the boron hydrides is made.

Stereospecific polymerization of 2‐substituted‐1,3‐butadienes. I. Crystalline polymers of 2‐tert‐butyl‐1,3‐butadiene

AbstractSome results obtained in the stereospecific polymerization of 2‐tert‐butyl‐1,3‐butadiene are reported. The catalysts employed were prepared from TiCl4 and aluminum alkyls or soluble aluminum hydride derivatives. Polymers thus obtained were crystalline with a melting point of 106°C. and soluble in common solvents. X‐ray investigation shows the polymer to have a helical chain structure built on 11 monomeric units with cis configuration, distributed on three turns. The identity period along the chain axis is 15.3 A. A comparison of the infrared spectra of the crystalline and amorphous polymers is given. Attempts to obtain a crystalline 1,4‐trans polymer failed; this is in accord with the lower stability of such a configuration due to steric repulsion of the bulky group.

Stereospecific polymerization of isoprene with alano‐derivatives and titanium compounds. II. Catalytic systems employing nitrogen‐containing derivatives of aluminum hydride and TiCl4

AbstractResults obtained in the stereospecific polymerization of isoprene with catalytic systems including TiCl4 and halogen‐alane compounds complexed with trialkylamines, or aluminum hydride derivatives containing Al—N or Al—O bonds, have been reported.In such systems, the Al/Ti ratio has an influence not only on the rate of conversion, but also on the steric composition and the molecular weight of the polymer obtained.The catalytically active compounds obtained by the reaction have been isolated and analysed.The polymerization takes place in heterogeneous phase.

N.M.R. SPECTRA OF SILICON HYDRIDE DERIVATIVES: II. CHEMICAL SHIFTS IN SOME SIMPLE DERIVATIVES1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN.M.R. SPECTRA OF SILICON HYDRIDE DERIVATIVES: II. CHEMICAL SHIFTS IN SOME SIMPLE DERIVATIVES1E. A. V. Ebsworth and J. J. TurnerCite this: J. Phys. Chem. 1963, 67, 4, 805–807Publication Date (Print):April 1, 1963Publication History Published online1 May 2002Published inissue 1 April 1963https://doi.org/10.1021/j100798a021RIGHTS & PERMISSIONSArticle Views295Altmetric-Citations45LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (400 KB) Get e-Alerts

1109. Boron hydride derivatives. Part IX. The reaction of decaborane with ammonia

1109. Boron hydride derivatives. Part IX. The reaction of decaborane with ammonia

Aluminum hydride derivatives containing Al-S bond

The synthesis of aluminum hydrides derivatives containing Al-S bond, obtained reacting a thiol with AlH3 and its derivatives, are reported. According to the poor electron donor properties of sulphur in thiols, such alanes are complexed with trimethyl-amine and sometimes they are associated through hydrogen bridges in benzene solution.

Bromination of Triphenyl Phosphine Borine

IN most compounds containing hydrogen linked to boron, the hydrogen atoms have a more or less pronounced electronegative or hydridic character. This is evident in the mildness of the conditions required for their reaction with water or hydrogen chloride to give molecular hydrogen. In the phosphinoborine ring polymers, however, the BH2 groups are exceptionally inert towards hydrolysis. Burg et al. have attributed this to a diminution in the hydridic character of the hydrogen atoms, caused by partial utilization of the B–H bonding electrons in forming π bonds between the boron and phosphorus atoms1–3. Triphenyl phosphine borine, (C6H5)3P.BH3, is another unusually inert boron hydride derivative. Since our preliminary report that it resisted hydrolysis4, we have found that it is not affected by refluxing for 1 hr. with 6 N hydrochloric acid; nor, when dissolved in benzene, does it react with hydrogen chloride gas at room temperature. This stable (m.p. 188°) and easily prepared compound appeals to us as a material with which to investigate the chemical behaviour of deactivated hydrogen atoms attached to boron. We here report the first of a series of experiments by means of which we hope to characterize more fully the type of reactivity possessed by these hydrogen atoms.

673. Boron hydride derivatives. Part VIII. Some reactions of sodium decaboranate in relation to decaboranylmagnesium iodide

673. Boron hydride derivatives. Part VIII. Some reactions of sodium decaboranate in relation to decaboranylmagnesium iodide

417. Boron hydride derivatives. Part VII. The characterisation of some decaborane derivatives of the type, B10H12,2M

Download options Please wait... Article information DOI https://doi.org/10.1039/JR9610002196 Article type Paper Download Citation J. Chem. Soc., 1961, 2196-2204 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS Permissions Request permissions 417. Boron hydride derivatives. Part VII. The characterisation of some decaborane derivatives of the type, B10H12,2M R. J. Pace, J. Williams and R. L. Williams, J. Chem. Soc., 1961, 2196 DOI: 10.1039/JR9610002196 To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page. If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page. Read more about how to correctly acknowledge RSC content. Search articles by author R. J. Pace J. Williams R. L. Williams

81. Boron hydride derivatives. Part II. The separation and identification of some ethylated pentaboranes and decaboranes

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XXXVIII.—On some new derivatives of the hydride of salicyl

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XXV.—On the derivatives of hydride of heptyl

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