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(R)-(+)-1,1,2-triphenyl-1,2-ethanediol can be used to derivatize chiral monoesters via stereoselective aldol addition; forming O-silyl orthoesters and cyclic phosphonates.

(R)-1,1,2-triphenylethane-1,2-diol [(R)-(1)] is easily available from commercial (R)-Mandelic Acid, which is  first esterified to give methyl mandelate and then treated with Phenylmagnesium Bromide (3.5 equiv). In an analogous way, (S)-(1)  is accessible from (S)-mandelic acid, which is also commercially available (eq 1).

Journal of the American Chemical Society, 81, p. 493, 1959 DOI: 10.1021/ja01511a058
Synthesis, p. 415, 1987
Tetrahedron, 49, p. 1327, 1993 DOI: 10.1016/S0040-4020(01)85822-1