G. B. Rintoul

Citronellol: geraniol ratios and temperature in geranium (Pelargonium hybrid)

Concentrations of citronellol and geraniol in essential oil from rose geranium (Pelargonium hybrid) were monitored monthly over four years using gas chromatography-mass spectrometry. Geraniol concentrations fell in winter and citronellol concentrations increased in spring. The citronellol/geraniol (C:G) ratio was a more sensitive indicator of change in oil composition than the concentration of either alcohol in isolation. C:G ratios rose sharply if the minimum air temperature (T-min) fell below 5.5 degrees C for any time during the 5 d prior to monthly harvesting, A nonlinear model is proposed to predict the C:G ratio at any T-min. High C:G ratios indicated cold stress in geranium plants.

A Comparison of the Potent in vitro Antitumor Activity of Triphenyltin Benzoates with that of Related Tin Compounds

A variety of structurally diverse triphenyltin esters exhibit almost identical in vitro antitumor activity to the potent triphenyltin benzoates and greater activity than cisplatin. This activity is independent of the structure of the ester moiety and comparable to triphenyltin hydroxide, suggesting hydrolysis to a common, cytotoxic tin intermediate.

The high pressure addition of aldehydes to allylstannanes: a ‘Diels–Alder like’ transition state

The activation volume for the addition of chloral to allyltributylstannane was found to be –33.4 ± 0.6 cm3 mol–1, which is consistent with a concerted, cyclic transition state.