In 2007, Gois and Jang groups reported, respectively, that the binuclear Rh(II) complex, V, containing N-Heterocyclic Carbenes (NHC) as auxiliary ligands, can be a profitable tool in (i) the arylation of aldehydes and (ii) the allylic
oxidation reaction [49, 50].
There are three major groups of phytochemicals: the polyphenols which can be subcategorized as the flavonoids, phenolic acids and other non-flavonoid polyphenols; the terpenoids, which can be subcategorized as the carotenoids and non-carotenoid terpenoids; and the thiols, which includes the glucosinolates, allylic
sulfides and non-sulphur containing indoles (Table.
The 1H NMR spectrum (400 MHz CDCl ) of compound (4) clearly revealed a triterpene type carbon skeleton of the lupane series with two exomethylene proton resonances at A 4.67 (1H s Ha-29) and 4.55 (1H s Hb-29) which together with an allylic
methyl group of three proton intensity at A 1.67 (s H3-30) confirmed an isoprenyl functionality.
-C[H.sub.2]-C[H.sub.2]-C(=O)-, [H.sub.-3]), 1.90-2.06 (m, 4H, C[H.sub.2] allylic
), 2.24 (t, J = 7.2, -C[H.sub.2]-C(=O)-, [H.sub.-2]), 2.68 (t, 2H, J = 6.2, C[H.sub.2] doubly allylic
), 4.27 (t, 2H, COO-C[Hj.sub.2]-, J = 7.2, [H.sub.-20]) and 4.22 ppm (t, 2H, COO-C[H.sub.2]-, J = 7.2, Hz, [H.sub.19]), 5.18 ppm (dt, J = 11.0 and 7.0, [H.sub.-9]), 5.3-5.1 ppm (4H from C18:2 C[H.bar]=C[H.bar]-C[H.sub.2]-C[H.bar]=C[H.bar] and 2H from C18:1 double bond of the CFA mixture), 5.51 (dt, J = 15.0 and 7.0, [H.sub.-12]), 5.76 (dd, 1H, J = 10.4 and 1.2, C[[H.sub.2].bar]=C[H.sub.-], [H.sub.-23a]), 5.80 (t, 7= 11.0, [H.sub.-11]), 6.04 (dd, 1H, 7= 17.4 and 10.4.