158752-98-8Relevant articles and documents
The active metal sodium or lithium quenching method (by machine translation)
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Paragraph 0017, (2019/04/26)
This invention claims an active metal sodium or [...] method. In the use of the metal sodium to participate in free radical coupling reaction or metal lithium participation when halogen lithium exchange reaction, reaction to the end of the excess active metal usually security quenching, excessive metal sodium and lithium adopts the halogenated hydrocarbon to process quenching, to avoid using traditional water or mellow quenching when the generation of hydrogen gas, operating the safety factor is increased. The method is simple in operation, the generated coupling alkane does not influence the reaction processing, is suitable for industrial scale production quenching using. (by machine translation)
A method of synthesizing joint boric acidfrequency that ester
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Paragraph 0055-00, (2017/03/08)
The invention relates to a method for synthesizing bisdiboron. The method comprises the following steps: preparing a tri-substituted boron midbody from raw materials, namely, nafoxidine and boron tribromide which are easy to obtain from the market, in the presence of an acid-binding agent triethylamine; subsequently reacting with boron tribromide to obtain a bromo-boron midbody; coupling the product in the presence of metal sodium to obtain nafoxidine-substituted coupled boron; finally adding pinacol to react, thereby obtaining a target product, namely, the bisdiboron. The method has the advantages that nafoxidine can be directly recycled, and the triethylamine hydrobromide can be also directly recycled after being simply neutralized and dried. The midbodies obtained in the method disclosed by the invention can be directly used after the solvent is simply distilled, except the compound, the midbodies are all solids when being purified, the operation is easy, the solvent and the reagents can be recycled, the damage to the environment is reduced, and the process can be successfully expanded to be the scale greater than 10kg.
Synthesis and structure of pyrrolidinobromodiboranes(4)
Nie, Yong,Pritzkow, Hans,Siebert, Walter
, p. 1016 - 1019 (2007/10/03)
The reaction of tetrapyrrolidinodiborane(4) (1) with BBr3 in a 1:1 molar ratio yields a mixture of 1,2-dibromo-1,2-dipyrrolidinodiborane(4) (2) and bromotripyrrolidino- diborane(4) (3), while a 1:2 molar ratio leads in Et2O to compound 2 as the main product along with a small amount of [(C4H8N)2B2Br3(OEt)] (4). The new compounds have been characterized by NMR and MS data, as well as by X-ray structure analyses of 2 and 4, of which the former exhibits an interesting polymorphism phenomenon.
Tetra(pyrrolidino)diborane(4), [(C4H8N)2B]2, as a New Improved Alternative Synthetic Route to Bis(pinacolato)diborane(4) - Crystal Structures of the Intermediates
Ali, Hijazi Abu,Goldberg, Israel,Srebnik, Morris
, p. 73 - 78 (2007/10/03)
The compound tetra(pyrrolidino)diborane(4) (3) is an important new and alternative precursor for the preparation and synthesis of bis(pinacolato)diborane(4). The latter is the major intermediate among the diborane derivatives used for many addition and insertion reactions into multiple bonds. The crystal structure of 3 and its precursor, tris(pyrrolidino)borane, 1, were determined. In addition the solvolysis reactions and solution behavior of 3 with alcohols were examined.
Contribution to the Chemistry of Boron, 222. Chemistry of Diborane(4) Derivatives: Mixed Tetraaminodiboranes(4) and Additions of Diborane(4) Derivatives to an Amino-imino-borane
Loderer, Dirk,Noeth, Heinrich,Pommerening, Hans,Rattay, Wilfried,Schick, Hannes
, p. 1605 - 1612 (2007/10/02)
Several transamination reactions of B2(NMe2)4 (1a) with secondary amines have led to mixed tetraaminodiborane(4) compounds B2(NMe2)4-n(NR2)n (2-4), and B2(NC5H10)4 (1d) has been characterized by an X-ray structure analysis which reveals the presence of a rather long B-B bond (1.75 Angstroem).However, tetraaminodiboranes(4) of type R2N(Me2N)B-B(NMe2)NR2 are more readily accessible from LiNR2 and B2(NMe2)2Cl2.Similarly, amination of B2(NMe2)2Cl2 with N,N'-dimethylethylenediamine (7) yields B--N,N'-dimethyl-1,3,2-diazaborolidine (8), while reactions with Li(Me)N-CH2-CH2-N(Me)Li (9) lead also to 2,3-bis(dimethylamino)-1,4-dimethyl-1,4,2,3-diazadiborinane (10) as the kinetically controlled product.This is further substantiated by the reaction of the B2(NMe2)2Br2 with 9 which gives exclusively the corresponding 1,4,2,3-diazadiborinane 11.Diborane(4) dihalides B2(NMe2)2X2 (X = Cl, Br) react only in 1:1 ratio with tmp-BN-CMe3 (13) leading to 14a, b.However, both a 1:1 and 1:2 methoxyboration of 13 has been observed with B2(OMe)4 with formation of 15 and 16. - Key Words: Diborane(4), tetraamino-, derivatives / Diborane(4), tetrapiperidino / 1,2,3,6-Diazadiborinane derivatives / Haloboration / Methoxyboration
