Trimers/trimerization

Monomer Dimer + Dimer + Trimer + Trimer + Trimer + Tetramer Tetramer Tetramer Tetramer Pentamer Pentamer... 

At low temperature there are two resolved peaks for the methyl substituents, but the observed splitting is reduced on increasing temperature. X-ray diffraction results show that the unit cell consists of a cyclic trimeric arrangement to 3,5-di-methylpyrazole molecules. Within this trimer, the 3,5-dimethylpyrazole molecules have C2v symmetry, the cyclic trimer has threefold symmetry, and the hydrogen involved in the tautomeric process is refined with half occupancy. These results indicate that, at room temperature, a trimer-trimer intermolecular tau-tomerism takes place in 3,5-dimethylpyrazole. In contrast, for pyrazole, the N-H... 

Dimer gallate dimer digallate trimer trimer gallate tetramer... 

Trimer trimer gallate tetramer tetramer gallate pentamer... 

Figure 41 Structure of MenB, the dihydroxynaphthoyl-CoA synthase from M. tuberculosis, (a) Two monomers from the MenB hexamer showing the C-terminus of one monomer crossing the trimer-trimer interface to contribute to the active site of the adjacent monomer, (b) Active site showing the iocation of conserved cataiytic residues from subunit L (gray) or H (yeiiow). The AcAc iigand is shown in siate and the residues in red are at the ends of a ioop that is disordered in the crystai structure.

T vo kinds of ethynyl aryl ketones were chosen as starting units. One was ethynyl ketone 50 and the other was m-propynoylphenyl trimethylsilylethynyl ketone 51. Cross-trimerization of these units afforded a mixture of four kinds of trimers trimer 53 from 3 mol of 50,2 1-trimer 52,1 2-trimer 54, and trimer 55 from 3 mol of 51. These trimers could be separated by GPC. The trimer 52 was subjected to the second trimerization reaction after deprotection to afford dodecaketone 49 [55 b]. 

Triisopropyl trilinoleate Synonyms 9,12-Octadecadienoic acid trimer, methylethyl triester Triisopropyl trimerate Trimer acid, isopropyl triester Trimer acid, 1-methylethyl triester Tri (1-methylethyl) trimerate... 

Synonyms Triiosoctadecyl trimerate Triisostearyl trimerate Trimer acid, octadecyl triester... 

Trilene 67. See EPDM rubber Trilene CP40 Trilene CP80. See EPM rubber Trilin 5, Trilin 10G Trilin AT, Trilin GRP, Trilin . See Trifluralin Trilinoleic acid CAS 7049-66-3 68937-90-6 Synonyms Fatty acids, C18, unsaturated, trimers 9,12-Octadecadienoic acid, trimer Trimer acid... 

The purple membrane (PM) exists in the plasma membrane of Halobacterium halobium, and its constituent protein, bacteriorhodopsin (bR), functions as a light-driven proton pump. In the PM, bR monomers are associated to form a trimeric oligomer and the trimers are arranged in a hexagonal lattice (see also chapters 17 and 18). However, several aspects in the crystal formation remain open for example, (1) trimer-trimer interaction sites and association energy and (2) existence of preformed trimers in the fluidic noncrystal region. In the 2D crystal of bR and any crystals in general, they are in dynamic equilibrium with the constituents at the interface between the crystal and the liquid phase. Here, we visualized dynamic events at the interface in the PM to provide information of the crystal formation and intermolecular interactions. ... 

With this process, chains grow in a sequential manner. That is, one monomer unit reacts with another monomer unit to produce a sequence of two mer units or dimer . The resulting dimer reacts with a monomer to produce a sequence of three mer units or trimer . Trimers, dimers and monomers can react to produce an oligomer or a chain composed of a small number of mer units (often considered to be less than ten). In this way, the reaction continues (or propagates) until eventually a chain stops growing or terminates. As a result, an addition reaction is usually characterized by three stages. 

---