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Holub J, Jelínek T, Hnyk D, et al. Phosphacarborane chemistry: the 7,8,9,11-, 7,9,8,10- and 7,8,9,10-isomers of nido-P2C2B7H9--diphosphadicarbaborane analogues of 7,8,9,10-C4B7H11. Chemistry. 2001;7(7):1546-54doi: 10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k.
Holub, J., Jelínek, T., Hnyk, D., Plzák, Z., Císarová, I., Bakardjiev, M., & Stíbr, B. (2001). Phosphacarborane chemistry: the 7,8,9,11-, 7,9,8,10- and 7,8,9,10-isomers of nido-P2C2B7H9--diphosphadicarbaborane analogues of 7,8,9,10-C4B7H11. Chemistry (Weinheim an der Bergstrasse, Germany), 7(7), 1546-54. https://doi.org/10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k
Holub, J, et al. "Phosphacarborane chemistry: the 7,8,9,11-, 7,9,8,10- and 7,8,9,10-isomers of nido-P2C2B7H9--diphosphadicarbaborane analogues of 7,8,9,10-C4B7H11." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 7,7 (2001): 1546-54. doi: https://doi.org/10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k
Holub J, Jelínek T, Hnyk D, Plzák Z, Císarová I, Bakardjiev M, Stíbr B. Phosphacarborane chemistry: the 7,8,9,11-, 7,9,8,10- and 7,8,9,10-isomers of nido-P2C2B7H9--diphosphadicarbaborane analogues of 7,8,9,10-C4B7H11. Chemistry. 2001 Apr 01;7(7):1546-54. doi: 10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k. PMID: 11330911.
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Chemistry. 2001 Apr 01;7(7):1546-54. doi: 10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k.

Phosphacarborane chemistry: the 7,8,9,11-, 7,9,8,10- and 7,8,9,10-isomers of nido-P2C2B7H9--diphosphadicarbaborane analogues of 7,8,9,10-C4B7H11.

Chemistry (Weinheim an der Bergstrasse, Germany)

J Holub, T Jelínek, D Hnyk, Z Plzák, I Císarová, M Bakardjiev, B Stíbr

Affiliations

  1. Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Rez.

PMID: 11330911 DOI: 10.1002/1521-3765(20010401)7:7<1546::aid-chem1546>3.0.co;2-k

Abstract

The reaction between the carborane arachno-4,6-C2B7H13 (1) and PCl3 in dichloromethane in the presence of a "proton sponge" (PS = 1,8-dimethylaminonaphthalene) resulted in the isolation of the eleven-vertex nido-diphosphadicarbaboranes 7,8,9,11-P2C2B7H, (2) and 3-Cl-7,8,11-P2C2B7H, (3-Cl-2) in yields of 54 and 7%, respectively. Replacement of the PS by NEt3 in the same reaction gave diphosphadicarbaboranes 2 and 3-CI-2 together with the isomeric species nido-7,9,8,10-P2C2B7H, (3) in yields of 28, 15 and 3%, respectively. The reaction between the isomeric carborane arachno-4,5-C2B7H13 (4) and PCl3 in dichloromethane in the presence of PS gave the asymmetrical isomer, nido-7,8,9,10-P2C2B7H, (5). along with the chloro derivatives 4-Cl-7,8,9,10-P2C2B7H8 (4-Cl-5) and 11-Cl-7,8,9,10-PC2B7,H8 (11-Cl-5) (yields of 21, 1 and 13%, respectively). The structures of the chlorinated derivatives 3-Cl2 and 11 -Cl-5 were determined by X-ray diffraction analysis. In addition, the structures of all compounds isolated were geometry-optimised and confirmed by comparison of experimental 11B chemical shifts with those calculated by the GIAO-SCF/II//RMP2(fc)/6-31G* method. The calculations also include the structure and 11B NMR shifts of the isomer nido-7,10,8,9-P2C2B7H9 (6) which has not yet been isolated.

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