A 1 ‐Silyl‐1<i>H</i>‐phosphirene/1, 2‐Dihydro‐1,2‐phosphasilete Rearrangement—The Decisive Step in the Synthesis of Heterocycles Containing 2‐Phospha‐1,3‐diene Units

Abstract

The silyl-substituted l-H-phosphirene 1 rearranges photochemically to the dihy-drophosphasilete 2. When 2 is acylated at the phosphorus atom a spontaneous 1, 3-silyl shift leads to formation of 3, a heterocycle with a 2-phospha-l, 3-diene unit. R1  R3  tBu, R2  Ph.