ABSTRACTThis review article focuses on 1λ3-phosphaalkene compounds derived from phosphines containing at least one silicon-phosphorous bond. 1λ3-Phosphaalkene compounds are of high value as they are used to form several phosphorous compounds containing a transition metal and main group elements. In addition to the fact that different kinds of 1λ3-phosphaalkynes are prepared from 1λ3-phosphaalkenes. Both families of phosphorous compounds; 1λ3-phosphaalkenes and 1λ3-phosphaalkynes have become important to chemists, as they are used in preparing several phosphorous compounds to be used as homogeneous catalysts in chemical reactions.