Dünnschichtchromatographische Identifizierung organischer Peroxide

Medicinal Flowers. XI. Structures of New Dammarane-Type Triterpene Diglycosides with Hydroperoxide Group from Flower Buds of Panax ginseng

“…H-and 13 C-NMR spectra of 1 were superimposable on those of ginsenoside Rg 1 (10), 10) whrereas the signals designated to the side chain moiety (C-20-C-27) of the aglycon part were similar to those of notoginsenoside-C. 16) As shown in Fig. 1, the (14), which was isolated from Vietnamese ginseng. 17) On the basis of this evidence, the struc- 14) The IR spectrum of 2 showed absorption bands at 3433, 1655, and 1076 cm C-NMR spectra of 2 were superimposable on those of 1 and ginsenoside Rg 1 (10), 10) while the signals due to the side chain part very resembled those of notoginsenoside-E.…”

“…14) The IR spectrum of 6 showed absorption bands assignable to hydroxyl and olefin functions at 3566, 1655, and 1078 cm…”

“…Floralginsenoside E (5), obtained as an amorphous powder with positive optical rotation ([a] D 22 ϩ17.6°in MeOH) and positive response to the hydroperoxide reagent, 14) showed absorption bands at 3451, 1655, and 1078 cm Ϫ1 due to hydroxyl, olefin, and ether functions in the IR spectrum. The positive-ion and negative-ion FAB-MS of 5 exhibited quasimolecular ion peaks at m/z 839 (MϩNa)…”

Tigliane Type Diterpene-esters with Epstein–Barr Virus-inducing Activity fromSapium sebiferum

“…The MS spectrum of 5 showed a molecular ion peak at m/z 700.4180, corresponding to the formula C4oH6001O (caled. 700.4186), and hence the molecular formula of 2 was determined to be C3sH600,0' 2 showed a positive color reaction with N,Ndimethyl-p-phenylenediamine dihydrochloride 9 ) and liberated one mole equivalent of iodine by the Wagner-Smith-Peters method. 'O ) This evidence indicated the presence of a hydroperoxy group at C-7 in 2.…”

Medicinal Flowers. XVI. New Dammarane-Type Triterpene Tetraglycosides and Gastroprotective Principles from Flower Buds of Panax ginseng

“…23) The IR spectrum of 3 showed absorption bands at 3415, 1686, and 1083 cm Ϫ1 assignable to hydroxyl, olefin, and ether groups, respectively. In positive-ion FAB-MS of 3, a quasimolecular ion peak was observed at m/z 1133 (MϩNa) 13 C-NMR spectrum of 3 were superimposable on those ginsenoside Rc, 24) except for the signals due to the side chain part (C-22-C-27), which were similar to those of notoginsenoside-E 25) and -K. 26) On the basis of this evidence and detailed examination of 1 H-1 H COSY and HMBC experiments (Fig.…”