کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1325180 | 977373 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and properties of air-stable 1,3-diphosphacyclobutane-2,4-diyls and the related compounds Synthesis and properties of air-stable 1,3-diphosphacyclobutane-2,4-diyls and the related compounds](/preview/png/1325180.png)
A kinetically stabilized phosphaalkyne bearing a bulky Mes∗ (2,4,6-tri-t-butylphenyl) group is useful compound to prepare an enormous number of highly stable 1,3-diphosphacyclobutane-2,4-diyls through reactions with a lithium reagent and an electrophile. By utilizing this synthetic protocol, we prepared several non-symmetrical 1,3-diphosphacyclobutane-2,4-diyls in which the substituents on the phosphorus are different. Furthermore, we succeeded in preparation and characterization of novel air-tolerant symmetrical 2,4-bis(2,4,6-tri-t-butylphenyl)-1,3-diphosphacyclobutane-2,4-diyls bearing the identical alkyl substituents on the phosphorus atoms. Structures and properties of the 1,3-diphosphacyclobutane-2,4-diyls indicate characters as singlet ground-state carbon centered biradicals. In addition to those biradicals, we succeeded in preparation and isolation of a novel P-heterocyclic air-stable neutral radical as well as a P-heterocyclic cation radical.
Reactions of a kinetically stabilized phosphaalkyne (Mes∗C P; Mes∗ = 2,4,6-tri-t-butylphenyl) with lithium reagents and electrophiles afford several 1,3-diphosphacyclobutane-2,4-diyls of biradical type (3). Structures and properties of 3 indicate characters as singlet ground-state carbon-centered biradicals. We also succeeded in preparation and isolation of a novel P-heterocyclic air-stable neutral radical (8) and a P-heterocyclic cation radical (9).Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 692, Issue 13, 1 June 2007, Pages 2761–2767