Beiträge zur Chemie des Phosphors, 103 [1, 2]. Tri-tert-butyl-diphosphaarsa-cyclopropan, (t-BUP)2 (t-BuAs) / Contributions to the Chemistry of Phosphorus, 103 [1, 2]. Tri-tert-butyl-diphosphaarsa-cyclopropane, (t-BuP)2(t-BuAs)
Open Access
- 1 May 1981
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 36 (5) , 527-531
- https://doi.org/10.1515/znb-1981-0501
Abstract
The first three-membered P2AS heterocycle, tri-tert-butyl-diphosphaarsa-cyclopropane (tri-tert-butyl-diphosphaarsirane) (1) was synthesized by [2+1] cyclocondensation of K(t-Bu)P-P(t-Bu)K with t-BuAsCl2 in n-pentane at - 78 °C. Tetra-tert-butyl-1,2-di-phospha-3,4-diarsa-cyclobutane (2), tetra-tert-butyl-triphosphaarsa-cyclobutane (3) as well as (t-BuP)4 and five-membered cycloarsaphosphanes are also formed. The diphospha-arsa-cyclopropane 1 could be isolated in a pure state. It forms two diastereomers, of which the isomer with trans-orionted tert-butyl groups at the phosphorus atoms is the most stable. The 31P NMR parameters of the four-membered cycloarsaphosphanes 2 and 8 are reportedKeywords
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