Burg’s method

Other constrained methods have also been applied. Beatham and Orchard (1976) experimented with Biraud s method but experienced only limited success. Vasquez et al (1981) found that maximum entropy is capable of yielding excellent results on simulated ESCA data. The authors, who used Burg s method, cite its freedom from need for trial-and-error optimization. They did, however, have to develop methods of dealing with problems of instability and lack of an order-selecting criterion. 

Tris(dimethylamino)phosphine (tdp) is prepared by the method of Burg and Slota. The benzonitrile complex, irans-[PdCl2(PhCN)2], is prepared by Kharasch s method. The benzene is dried over Linde 4-A molecular sieve. 

The yield of diborane by Stock s method is low it was prepared later by Schlesinger and Burg (1931) by passing boron trichloride and hydrogen at low pressure through an electric discharge. Modern methods employ lithium hydride, lithium aluminium hydride or lithium borohydride. 

Burge, C. B. 1998. Modeling dependencies in pre-mRNA splicing signals. In Computational methods in molecular biology, ed. S. Salzberg, D. Searls, and S. Kasif, 127-63. Amsterdam Elsevier Science. 

Alfred Stock (131) and his collaborators were the first to characterize a series of boranes. Properties and many reactions reported by them (1912-1936) have required but little revision to this day. For one hundred years prior to the investigations of Stock and his co-woikers, the boron hydrides had been produced intermittently, but they were not identified or analyzed correctly. Stock s work stimulated others, notably Burg and Schlesinger, to enter this field so that from 1930 until 1942, the date of an important review (HI), structural studies were carried out, and the abandon with which the boranes enter into chemical combination with themselves and with other molecules became evident. Development of improved, or even new, experimental methods has necessitated reinterpretation of most of the early structural results. As would be expected, preparative studies carried out prior to about 1942 have required less revision, providing a firm foundation on which a great extension of synthetic work could be built. 

Dimethylphosphine converted to the hydrochloride, then heated with (dimethyl-amino) dimethylphosphine at 95° in a high vacuum tetramethyldiphosphine. Y 96-97%. F. methods s. A. B. Burg, Am. Soc. 83, 2226 (1961). 

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