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The reactions of bromophenylacetylene with the diphenylphosphino amines (Ph2P)2NH and (Ph2P)3N result in the 1,1,3,3,4-pentaphenyl-1,2,5-azadiphospholium bromide ( 5 ) and its 4-diphenylphosphino derivative ( 7 ). Their X-ray structure analyses show planar rings for the cations. The small endocyclic angle at the nitrogen ring member is associated with PN bonds that are longer than in the acyclic cation (Ph3P)2N+. The data fit to a negative linear relationship of PN bond lengths and PNP bond angles. © 1997 John Wiley & Sons, Inc. 相似文献
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1λ6,2,4-Thiadiazetidines and 1,2λ6,3-Oxathiazetidines From the reaction of the sulfur triimides (RN?)3S ( 2a R?(CH3)3C, 2b R?(CH3)3Si) with pentafluoroazapropene ( 11 ) the appropriate 1λ6,2,4 thiadiazetidines ( 13a, 13b ) are formed, while from ClSO2N?CCl2 ( 14 ) and 2a (CH3)3C? N?C?N? SO2Cl ( 17 ) is isolated. 2b and hexafluoroacetone ( 18 ) give the rather unstable 1,2λ6,3-oxathiazetidine ( 20 ). 相似文献
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Alfred Schmidpeter Peter Mayer Johanna Stocker Kenneth A. Roberts Peter J. Stang 《Heteroatom Chemistry》1991,2(5):569-573
One example each is given for the reaction of bromoacetylenes and ethynyl-phenyliodonium tosylates with bis(diphenyl phosphino)methane. The yellow crystalline 1:1-addition products are diphospholium salts. They readily and selectively hydrolyze to give 2-phosphinoylethenyl phosphonium salts. 相似文献
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