Unexpected four- and eight-membered organo P-Se heterocycles |
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Authors: | Hua Guoxiong Li Yang Slawin Alexandra M Z Woollins J Derek |
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Institution: | School of Chemistry, University of St Andrews, Fife, UK. |
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Abstract: | Reaction of PhP(Se)(micro-Se)](2) (Woollins' reagent, WR) with symmetrically disubstituted diynes: five-membered P(Se)Se(2)C(2) heterocycles and bis-heterocycles with two five-membered P(Se)Se(2)C(2) rings connected through a C-C single bond; (t)Bu-Ctriple bond, length as m-dash]C-Ctriple bond, length as m-dash]C-(t)Bu reacts differently to afford an unprecedented four-membered P(Se)SeC(2) heterocycle with one unreacted triple bond and a fused bis-heterocycle containing two five-membered P(Se)SeC(3) rings fused at the middle two carbons of the diyne to give a heterocyclic analogue of pentalene, 3.3.0]octa-1-6-diene. |
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