- Synthetic routes to cyclic and unsymmetric diborane(4) compounds
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The reaction between 1,2-B2Cl2(NMe2)2 and disodium catecholate Na2[1,2-O2C6H4] affords the cyclic diborane(4) compound 1,2- B2(NMe2)2(cat) (cat = 1,2-O2C6H4), whereas a similar reaction using dilithium thiocatecholate Li2[1,2-S2C6H4] affords the 1,1-isomer 1,1- B2(NMe2)2(thiocat) (thiocat = 1,2-S2C6H4). Both compounds can be used to prepare unsymmetric diborane(4) species.
- Lesley, M.J. Gerald,Norman, Nicholas C.,Orpen, A. Guy,Starbuck, Jonathan
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p. 115 - 117
(2007/10/03)
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- Contribution to the Chemistry of Boron, 224 Reactions and Structure of Electron-Precise Triborane(5) and Tetraborane(6) Derivatives
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An improved synthesis of B3(NMe2)5 (2), B4(NMe2)6 (1), and B6(NMe2)8 (4) is reported.From each compound two of the four terminal dimethylamino groups are readily replaced by halogen atoms yielding α,ω-dihalides Bn(NMe2)nX2 (n = 3, 4; X = Cl, Br, I).These are used in turn to replace the substituent X by groups like RO, RS, RHN, R2P, and R.Crystal structure determinations on several of these compounds reveal as a common feature planar (C2N)BB2 and (C2N)B(B)X groups which are arranged in an approximately orthogonal manner to one another with NBBN dihedral angles ranging from 69 to 104.6 deg.Consequently, there is no significant ? bonding between the boron atoms. - Key Words: Triboranes(5), 1,ω-disubstituted / Tetraboranes(6), 1,ω-disubstituted / Hexaborane(8), octakis(dimethylamino)- / Electron-precise polyboranes
- Linti, Gerald,Loderer, Dirk,Noeth, Heinrich,Polborn, Kurt,Rattay, Wilfried
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p. 1909 - 1922
(2007/10/02)
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