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Solvent effect upon ion-pair extraction of different sodium dyes using some crown ethers
(Springer, 1999)
Liquid-liquid extractive-spectrophotometric studies of sodium ion complexes of 18-crown-6(18C6), dibenzo-18-crown-6(DB18C6), 15-crown-5(15C5), and 12-crown-4(12C4) and anionic dyes [4 (2 pyridylazo)-resorcinol monosodium ...
Trapping of 1,2-benzo-1,3,4-cycloheptatriene as evidence for a strained cyclic allene structure
(Pergamon-Elsevier Science Ltd, 1999)
8-brom-6,7-dihydrobenzocycloheptene 16 and 9-bromo-6,7-benzocycloheptadiene 17 have been synthesized via a new and simple method, and their allene reactions were studied. Treatment of 16 with a base in the presence of DPIBF ...
Ent-kaurene diterpenes from Sideritis athoa
(Harwood Acad Publ Gmbh, 1999)
Two new and six known ent-kaurene diterpenes were isolated from the whole plant of Sideritis athoa and their structures were elucidated as ent-3 alpha,18-dihydroxykaur-16-ene (1), athonolone (2), ent-3 beta-hydroxykaur-16-ene ...