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In nature, methoxy groups are found on nucleosides that have been subjected to 2′-O-methylation, for example in variations of the 5′-cap structure known as cap-1 and cap-2. They are also common substituents in O -methylated flavonoids , whose formation is catalyzed by O-methyltransferases that act on phenols , such as catechol- O -methyl ...
Cyclooctadiene iridium methoxide dimer is an organoiridium compound with the formula Ir 2 (OCH 3) 2 (C 8 H 12) 2, where C 8 H 12 is the diene 1,5-cyclooctadiene. It is a yellow solid that is soluble in organic solvents. The complex is used as a precursor to other iridium complexes, some of which are used in homogeneous catalysis. [1]
CH 3 SiCl 3 + 3 CH 3 OH → CH 3 Si(OCH 3) 3 + 3 HCl. Alcoholysis of alkylchlorosilanes typically proceeds via an S N 2 mechanism. Inversion of the configuration is favored during nucleophilic attack when displacing good leaving groups, such as chloride. [3] In contrast, displacement of poor leaving groups, such as alkoxide, retention is ...
Trimethyl orthoformate is also an effective reagent for converting compatible carboxylic acids to their corresponding methyl esters. [5] Alternatively, acid-catalyzed esterifications with methanol can be driven closer to completion by employing trimethyl orthoformate to convert water byproduct to methanol and methyl formate .
O-methylated flavonoids formation implies the presence of specific O-methyltransferase (OMT) enzymes which accept a variety of substrates. [1] Those enzymes mediate the O-methylation on a specific hydroxyl group, like on 4' (example in Catharanthus roseus [2]) or 3' (example in rice [3]) positions.
Trimethyl borate is the organoboron compound with the formula B(OCH 3) 3 and a metal alkoxide. It is a colourless liquid that burns with a green flame. [1] It is an intermediate in the preparation of sodium borohydride and is a popular reagent in organic chemistry. It is a weak Lewis acid (AN = 23, Gutmann-Beckett method). [2]
P(OCH 3) 3 → CH 3 P(O)(OCH 3) 2. As a ligand, trimethyl phosphite has a smaller cone angle and better acceptor properties relative to trimethylphosphine. A representative derivative is the colorless tetrahedral complex Ni(P(OMe) 3) 4 (m.p. 108 °C). [4] The tridentate ligand called the Kläui ligand is derived from trimethyl phosphite. The ...
The isolobal analogy can also be used with isoelectronic fragments having the same coordination number, which allows charged species to be considered. For example, Re(CO) 5 is isolobal with CH 3 and therefore, [Ru(CO) 5] + and [Mo(CO) 5] − are also isolobal with CH 3. Any 17-electron metal complex would be isolobal in this example.