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Synthesis of the second fragment for the Wittig reaction, deuterated nonanal (11a,b). Nonanoic acid (8a,b) was used as starting material. Experimental conditions: (a) Pd(C) 10%, D2O, NaOD (40%), 260 °C, 30 bar; (b) LiAlH4/THF; (c) PCC/DCM.
