1,3,2‐Diselena‐ and 1,3,2‐Ditelluraphospholanes with an Annelated 1,2‐Dicarba‐closo‐dodecaborane(12) Unit
1,3,2‐Diselena‐ and 1,3,2‐Ditelluraphospholanes with an Annelated 1,2‐Dicarba‐closo‐dodecaborane(12) Unit
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1,3,2âDiselenaâ 和 1,3,2âDitellura 磷烷与环状 1,2âDicarbaâclosoâdodecaborane(12) 单元
DOI:
10.1002/ejic.201301600
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发表时间:
1948
影响因子:
2.3
通讯作者:
W. Milius
中科院分区:
文献类型:
--
作者:
B. Wrackmeyer;E.V. Klimkina;W. Milius
The exchange reactions of phosphorus dihalides RPX2[R =iPr, cyclohexyl (Cy),tBu, (3,5‐Me2‐C6H3)CH2, Ph; X = Cl, Br], EtOPCl2, Et2NPCl2, Cl2PCH2PCl2, and Cl2PCH2CH2PCl2with 2,2‐dimethyl‐4,5‐[1,2‐dicarba‐closo‐dodecaborano(12)]‐1,3‐diselena‐2‐silacyclopentane provide a straightforward route to 1,3,2‐diselenaphospholanes. Some tellurium analogues were prepared from the dilithium salt [1,2‐(LiTe)2‐1,2‐C2B10H10] and were more difficult to characterize. For the selenium compounds, some of the P‐organosubstituted five‐membered rings dimerize to give ten‐membered rings, most readily with the more bulky alkyl groups such astBu. This was not observed for the tellurium compounds. The conformations of the five‐membered rings were studied by NMR spectroscopy and DFT methods. Striking structural differences were clear for the 2‐phenyl‐1,3,2‐diselenaphospholane derivative in solution and in the solid state. All reactions were monitored by multinuclear magnetic resonance spectroscopy (1H,11B,13C,31P,77Se, and125Te NMR), and solution‐state structures could be proposed. Remarkably large secondary isotope effects as isotope‐induced chemical shifts2Δ12/13C(31P) exerted by the carborane carbon atoms were observed; this is apparently a special property of the five‐membered ring. The gas‐phase structures were optimized by DFT methods [B3LYP/6‐311+G(d,p) level of theory], and the NMR parameters were calculated. Two 1,3,2‐diselenaphospholanes and one dimer were characterized by X‐ray analysis.
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影响因子:
2.1
作者:
Jean;A. Grand;A. C. Guimaraes;J. Robert
通讯作者:
J. Robert
影响因子:
2
作者:
G. Heckmann;E. Fluck
通讯作者:
E. Fluck
影响因子:
7.7
作者:
M. Pudovik;V. Ovchinnikov;R. Cherkasov;A. Pudovik
通讯作者:
A. Pudovik
影响因子:
2.8
作者:
R. Dickson;P. Elmes;W. R. Jackson
通讯作者:
W. R. Jackson
影响因子:
2.3
作者:
B. Wrackmeyer;E.V. Klimkina;W. Milius
通讯作者:
W. Milius