Synthesis of acylphosphines and acylaesines

1. The unsymmetrical secondary phosphines were synthesized: isopropylbenzylphosphine and tertbutylbenzylphosphine. 2. Treatment with ketenes or carboxylic acid chlorides gave a number of acyl derivatives of primary phosphines, of symmetrical and unsymmetrical secondary phosphines, and also of diisopropylarsine. 3. The parameters of the NMR spectra were measured for a number of simple phosphines, diisopropylarsine, and also the chloro and acyl derivatives.