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Prepared according to the procedure for compound 20 (Example 10, a) using diethyl (1-cyanoethyl)phosphonate. Nitrile 21 obtained as a colorless oil with 41% yield. 1H-NMR: (CDCl3, TMS): 0.96 and 1.00 (total 12H, both s, c-Hex-3,5-CH3); 1.34 (2H, s, c-Hex-4-CH2); 1.91 (3H, s, propionitrile-3-CH3); 2.04 and 2.28 ppm (total 4H, both s, c-Hex-2,6-CH2).

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