Page 1. Tetrahedron Letters,Vol.25,No.42,pp 4741-4744,1984 0040-4039/84 $3.00 + .Oo Printed in Great Britain 01984 Pergamon Press Ltd. PREPARATION OF PHOSPHINIC ACIDS: MICHAEL ADDITIONS OF PHOSPHONOUS ACIDS/ESTERS TO CONJUGATED SYSTEMS. John K. Thottathil*, Denis E. Ryono, Claire A. Przybyla, Jerome L. Moniot and Richard Neubeck The Squibb Institute for Medical Research P. 0. Box 4000 Princeton, New Jersey 08540 ...