Latent gelators

George M, Weiss RG. Chemically reversible organogels Aliphatic amines as latent gelators with carbon dioxide. J Am Chem Soc. 123(42) (2001) 10393-10394. 

George, M. and R.G. Weiss, Chemically reversible organogels via latent gelators. Aliphatic amines with carbon dioxide and their ammonium carbamates. Langmuir, 2002.18(19) 7124-7135. 

Here, disulfite is functioning as a latent acid, releasing protons and bisulfite upon hydrolysis (Equation 10). At the proper proton concentrations, (x=2, 3), rapid Cr(VI) reduction and fast gelation take place. Therefore at x=2 to 3, the redox reaction should be the same as if acid were added at n=2 to 6 (Equation 9). The gelation reactivity of the two are comparable under these conditions ... 

Quaternary Arsonium and Stibonium Compounds. More recently, experimental work in this laboratory has revealed that quaternairy arsonium compounds (18) are extremely effective as latent accelerators for epoxy-anhydride resius. Surprisingly, it has also been found that quaternary stibonium compounds are very much less effective as accelerators than quaternary arsonium, phosphonium or ammonium compounds. In fact, the order of gelation reactivity of these compounds with epoxy-anhydride resins would appear to be as follows ... 

Ladder polymer, 209-211 Lagrangian method, 441 Lag time, 376-377, 379, 443 Lanthanum silicate, 763 Laplace equation, 414, 678 Laser, 286-287 Laser fusion, 285 Latent heat, gelation, 304 Latex, 257, 258, 352 Lattice diffusion, 720, 723 Lattice mismatch, 727 Lead titanate, 848 Leatherhard point, 465 Leaving group, 24, 26, 27, 29, 30, 34, 44, 48, 131, 132, 138 LEFM, 494-496 Lens, 853 lens, silicate, 97 Lepidocrocite (FeOOH), 37 Lepidoidal silica, 505 Levitation apparatus, 350 Lewis acid, 659 Lewis acidity, of surface, 663 Ligand, 2, 3... 

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