ISSN:
1434-1948
Keywords:
Phosphorus heterocycles
;
Phosphaalkynes
;
Triphosphabenzene
;
Tetraphosphabarrelenes
;
Tetraphosphasemibullvalene
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene 4 reacts with phosphaalkynes P≡C-R [R = tBu (5a), tPen (5b)] at room temperature in a formal [4 + 2] cycloaddition to yield the corresponding 1,3,5,7-tetraphosphabarrelene derivatives 8a and 8b, respectively. The analogous reaction of 4 with the aminophosphaethyne P≡C-N(iPr)2 (9) unexpectedly leads to the 1,3,4,7-tetraphosphasemibullvalene derivative 10 as the only product. The single-crystal X-ray analysis of 10 exhibits a diphosphirane unit with a very long PP distance of 2.274(1) Å together with a large extension of the PCP angle in the three-membered ring to 75.3(1)°.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
Permalink