Der thermische Zerfall des tBu2P?PP(Me)tBu2 |
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Authors: | E. Matern G. Fritz J. Pikies |
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Abstract: | The Thermal Decomposition of tBu2P? P?P(Me)tBu2 The thermal decomposition of tBu2P? P?P(Me)tBu2 2 in C6H6 at 20°C is detectable after 10 h; tBu2PMe, (tBu2P)2PH and small amounts of the cyclotetraphosphanes P4(PtBu2)4 and P4(PtBu2)2 are formed. At 70°C (14 h) 83% of 2 are decomposed, and even 96% after 74 h. The main products are tBu2PMe (68%) and P4(PtBu2)4 (20%). With 2,3-dimethyl-1,3-butadiene as a trapping reagent tBu2PMe (62%) is still the main product, however, P4(PtBu2)4 is no longer found, but 1,2-bis(di-tert-butylphosphino)-4,5-dimethyl-1,2-diphosphacyclohexene-4 (22%) is formed instead. Also with cyclohexene tBu2PMe (78%) remains the major product besides P4(PtBu2)4 (9%) and small amounts of the trapping product 7-di-tert-butylphosphino-7-phosphabicyclo[4.1.0]heptane. Thus, the thermal decomposition of 2 at 70°C proceeds very similar to that of tBu2P? P?P(Br)tBu2 at ?30°C and starts yielding and the phosphinophosphinidene tBu2P? P. In CH2Cl2 the decomposition of 2 includes the chlorination of the ylidic molecule. |
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Keywords: | Phosphinophosphinidene-phosphorane tBu2P?P P(Me)tBu2 formation of tBu2PMe and the phosphinophosphinidene tBu2P?P 2,4-Bis(di-tert-butylphosphino)-1,2,3,4-tetraphosphabicyclo[1.1.0]butane P4(PtBu2)2 |
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