The reactivities of glucose, fructose, and sucrose with glycine (1:l molar ratio) at 60°C and pH 3.5, were compared over 280 hr. While fructose initially browned at a faster rate, it was overtaken by glucose after 80 hr. Initially more fructose than glucose was consumed, but the reverse was true after 60 hr. Sucrose was readily hydrolyzed under these reaction conditions and underwent MailIard browning reactions, its color and appearance being similar to the glucose solutions at the later stages of the experiment. Glucose and sucrose solutions developed considerable haze while the fructose glycine solution remained clear.

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Notes and the consequent reduction in solvent assistance drastically reduces lability. Registry No. [Ni(CH3CN)6]2+, 15554-59-3; ] Ni(tren)-(CH3CN)2]2+, 36805-39-7; [Ni(Me6tren)(CH3CN)]2+, 36870-56-1; [Co(CH3CN)6]2+, 16633-96-8; [Co(tren)(CH3CN)]2+, 36900-96-6; [Co(Me6tren)(CH3CN)]2+, 36870-57-2; CH3CN, 75-05-8.Acknowledgments. We thank the Australian Research Grants Committee for supporting this study.

Wasserhaltiges Mg‐ und Guanidinium‐tris‐[brenzcatechinato]‐silicat werden durch Reaktion von Brenzcatechin mit amorphem Mg‐trisilicat ohne oder unte Zugabe von Guanidiniumchlorid bei Raumtemperatur in neutraler Lösung oder durch Umsetzung von in konz. Ammoniak gelöster Kieselsäure mit Brenzcatechin und Guanidiniumchlorid synthetisiert.

The effectiveness of catechol, an aromatic vic-diol, in dissolv ing silicate minerals was studied. A synthetic amorphous magnesium trisilicate, Mg2Si30S·5~0, as well as the minerals olivine, sepio lite, diopside, augite, and enstatite were used to react with catechol I in slightly acidic, basic, and neutral solutions. It was found, de pending on the solvent used, that 33-52, S-17, 14-30, 5-11, 3-6 I also wish to express my sincere appreciation to Dr.