V. Arnaudinaud et al., Total synthesis of isotopically labelled flavonoids. Part 3: C-13-labelled(-)-procyanidin B3 from 1-[C-13]-acetic acid, TETRAHEDR L, 42(7), 2001, pp. 1279-1281
The regioselectively C-13-labelled (-)-procyanidin B3 was prepared in eight
steps from 1-[C-13]-acetic acid. (C) 2001 Elsevier Science Ltd. All rights
reserved.