词汇 | carbonyl |
释义 | BETA Examples of carbonylcarbonyl isn’t in the Cambridge Dictionary yet. You can help! Carbonyl sulfidemediated prebiotic formation of peptides. The article infrared spectroscopy of metal carbonyls discusses this in detail. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The high proportion of byproducts and low yield are explained by the easily reversible nature of the aldol condensation, and carbonyl chemistry in general. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Reaction on oxygen yields an enol derivative, while reaction on carbon yields an -substituted carbonyl compound. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A nucleophile in a nucleophilic addition can approach the carbonyl group from two opposite sides or faces. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The attacking nucleophilic amino group (circled red) is blue, and the attacked carbonyl carbon green. In the other isomers, where the two groups are linked together, the carbonyl group attracts the electrons, which destabilizes the protonated amine. The narrow tube near the extracellular side of the channel is constructed of four sequential rings of main-chain carbonyl oxygens of the polypeptides. Components of the carbonyl stretching band in the infrared spectra of hydrated 1,2diacylglycerolipid bilayers : a reevaluation. An a-sheet differs from a b-sheet in that all backbone carbonyl double bonds point in the same direction, rather than alternating directions in each peptide segment. Instead, in vibrational spectroscopy all carbonyl ' chromophores ' of the backbone amide groups are monitored, and this will reveal any change in backbone conformation even if very small. Sugars and their related compounds are collectively called polyhydroxylated compounds or polyols, reflecting their structure where a number of hydroxyl groups are attached to a carbon skeleton and carbonyl group. The positioning of the co-ordinating carbonyl oxygens within the filter is maintained by the interactions of a series of aromatic amino acids that surround the structure. Carbonyl nuclei present a simpler coupling pattern, with just a strong carbon-carbon one-bond scalar coupling. |
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